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<title>Journal of Hydroelectric Engineering-Forthcoming Articles</title>
<description>Forthcoming Articles</description>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb</link>
<language>EN-US</language>
<docs>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/1003-1243/current.shtml</docs>
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<ttl>1003-1243</ttl>
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<title><![CDATA[Prediction of fragmentation of blasting based on LM algorithm neural network model]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1590.shtml</link>
<description><![CDATA[Blasting is one of the most common methods of the work in exploitation of rock-fill dam. Blasting fragmentation and its distribution not only affect the excavation and loading efficiency of mining materials, but also have a great impact on the compaction quality of the dam. Therefore, adjusting blasting design parameters to control the fragmentation distribution of mining materials is one of the important measures for real-time blasting control. Aiming at the deficiency of traditional model for predicting fragmentation, a two hidden layers LM neural network model has been presented to predict the blasting fragmentation. Through a water conservancy project of blasting test fragmentation analysis, the validity and practicability of the neural network model and method are verified by an engineering blasting test example.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Renchao,WU Song]]></author>
<pubDate><![CDATA[2018-12-21 00:00:00.0]]></pubDate>
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<title><![CDATA[The digital dynamic control over the whole construction process of large hydropower projects]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1589.shtml</link>
<description><![CDATA[In the process of large-scale hydropower project construction, it is faced with the complexity of production factor flow, the accuracy and effectiveness of physical measurement, as well as the forward-looking and real-time management problems caused by the differences in management systems, business processes and technological processes of all parties involved. In this paper, relying on the lower reaches of the jinsha river hydropower construction, With the new generation of information technology such as positioning technology, series works are conducted including in-depth research on the integration of engineering construction and information technology, integrated research and development of hybrid superposition positioning technology with different positioning accuracy and response speed in complex environment; formulating the standardized process flow with uniform management form and coding system for each specialty of electrical construction, developing mobile online application systems, research and development of key process intelligence technologies and equipment systems, building an information system through the whole process of project pricing. All the achievements ensure the acquisition of comprehensive, true, accurate and real-time data throuth the project construction management, and realize the digital dynamic control of the whole process of engineering construction, which include the flow factors of personnel and equipment, core business processes such as quality and safety, key technological processes such as concrete pouring temperature control and cement grouting, and real physical costs such as unit engineering measurement. The management technologies presented in this article can promote tthe whole optimization of the management chains, such as t he business chain and the process chain , and lay a foundation for intelligent construction, and is an important part of intelligent technology in engineering construction.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[FAN Qixiang, YANG Zongli, WANG Zhilin, HE Wen, WU Kun]]></author>
<pubDate><![CDATA[2018-12-21 00:00:00.0]]></pubDate>
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<title><![CDATA[Analysis on applicability and influence factors of real-time monitoring indexes for earth-rockfill dam materials compaction]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1588.shtml</link>
<description><![CDATA[Real-time compaction monitoring technology has become an effective means for compaction quality control of rockfill dams. However, the types of the dam materials of concrete face rockfill dam (CFRD) are more than one, leading to obvious differences in composition and construction techniques. Therefore, the impact of different construction techniques on compaction monitoring indicators and the applicability of the indicators in different dam zones need to be further studied. Combining with field rolling tests, this paper analyzed the influence of rolling direction, roller vibration mode and dam material type on the indexes. The result shows that rolling vibration frequency is the main influencing factor. At the same time, it finds that the index CCV which contains more harmonic components of roller&rsquo;s acceleration has better adaptability to different CFRD dam materials. Based on the above analysis, CCV coupled with its frequency was proposed to evaluate compaction quality of different CFRD dam materials. The study can provide a reasonable and applicable monitoring index for real-time quality control on various CFRD materials compaction.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LIU Donghai, LIU Zhilei, FENG Youwen]]></author>
<pubDate><![CDATA[2018-12-20 00:00:00.0]]></pubDate>
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<title><![CDATA[The fracture-strength of dam concrete and its determination method]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1587.shtml</link>
<description><![CDATA[To prevent concrete cracking is a significant issue in the construction of momentous hydraulic concrete structures. The establishment of accurate cracking criteria and the determination of the true mechanical parameters of concrete are the key basis for cracking risk evaluation and crack stability analysis of concrete structures. Thus, in this paper, the concept of the fracture-strength of concrete was introduced. The calculation method for determining fracture-strength of concrete based on fracture toughness was established by combining the traditional strength theory with the fracture mechanics. The proposed method can characterize the effect of initial defects in concrete on its macroscopic crack resistance. Then, the accuracy and rationality of the proposed method for determining fracture-strength were verified by using existing experiment results. The results show that the fracture-strength of concrete can be used as an intrinsic material property of cracking analysis. Thus, an innovative method for concrete structure design was provided.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Mi Zhengxiang, Hu Yu, Li Qingbin]]></author>
<pubDate><![CDATA[2018-12-19 00:00:00.0]]></pubDate>
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<title><![CDATA[Fragmentation Process and Habitat Quality Assessment of Wetland Landscape in Gansu Section of Heihe River Basin]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1586.shtml</link>
<description><![CDATA[The wetland of Gansu section of Heihe river basin plays an important strategic role in the national ecological construction. Under the stress of social and natural factors, the planning and protection of wetland resources in this area is extremely urgent. Based on remote sensing images, this paper selects the landscape fragmentation index to analyze the process of wetland landscape fragmentation in the research area, and introduces an Integrated Valuation of Environmental Services and Tradeoffs model to comprehensively evaluate the wetland resource ecological environment quality in the two periods from 2000 to 2008 and from 2008 to 2016. Research shows: (1) From 2000 to 2008, the area of wetland types in the study area decreased significantly, and the area of shrub swamps decreased the most. After 2008, the area of wetland types began to increase.(2) The degree of landscape fragmentation in the study area continued to deteriorate from 2000 to 2008, but the degree of landscape fragmentation began to improve after 2008.(3) The ecological environment quality of the wetland in the study area is generally good, and the extremely important habitat wetland area accounts for 86% to 94% of the total area.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HU Xin, YANG Dong, SHI San-e, LI Xin]]></author>
<pubDate><![CDATA[2018-12-19 00:00:00.0]]></pubDate>
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<title><![CDATA[Effects of low pressure edge of short blade on cavitation performance of pump-turbine]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1585.shtml</link>
<description><![CDATA[In order to investigate the influence of the low pressure edge position of short blade on the cavitation performance of a high-head pump-turbine with splitter blades runner, so 3 kinds of short blade had been designed with different low pressure positions schemes according to the structural characteristics of runner with splitter blades. Short blades were named as scheme A, B, and C from the largest to the smallest by the ratio of the diameter of low pressure edge at upper crown position to the diameter of runner throat. The smaller the ratio, the posterior the position of the low pressure edge was. The Rayleigh-Plesset cavitation model was used to simulate the steady-state of three schemes under three turbine and two pump conditions respectively, comparison of cavitation morphology and energy between runner with three schemes under calculation conditions were analyzed. The results show that the cavitation performance of the runner is improved as the low pressure edge of short blade moves backward at small discharge operational condition. However, at large and medium discharge conditions, the cavitation performance of scheme B runner is optimal. The cavitation degree of the runner slows down firstly and then aggravates with the relative position moving backward under the high-head pump condition. But in the low-head condition, the Scheme A's low pressure side position is most conducive to improving cavitation performance. Considering both turbine and pump modes, the scheme B with the diameter ratio of 0.9487 has the better cavitation performance, and its efficiency or head is also relatively high. The conclusion has guiding significance for hydraulic optimization design of high-head pump-turbine runner.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[NING Nan, LAI Xi-de,LI PING]]></author>
<pubDate><![CDATA[2018-12-18 00:00:00.0]]></pubDate>
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<title><![CDATA[Reliability Analysis on Anti-Slide Stability of Gravity Dam using Cat Swarm Optimization]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1584.shtml</link>
<description><![CDATA[The response surface method is widespread used for the calculate of reliability of the gravity dam against sliding. Aimed at the problems that the traditional response surface method is short of the parameter screening analysis and the lack of study that using intelligent algorithm to calculate reliability index, a weighted dynamic response surface reliability analysis method using cat swarm optimization was presented. The shortcoming is also conquered that massive repeated sampling is needed for Monte Carlo method. Firstly, considering the seepage-stress coupling of dam foundation, the important parameters of rock mass are chosen by the quantitative global sensitivity analysis method. Secondly, the implicit performance function is approximated by the weighted response surface, and the dynamic updating is realized along with the calculate of reliability index using cat swarm optimization. At last, taking a concrete gravity dam project as an example, the sensitivity of dam foundation parameters and the engineering reliability are analyzed. The results show that the dam foundation shear strength parameters have signally influence on the dam stability and the reliability index is 2.71, which is accordant with the result of standard method. The proposed method is rational and reliable, and will benefit the further research.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHU Xiaobin，WANG Xiaoling，LI Xiao，XIE Huaiyu]]></author>
<pubDate><![CDATA[2018-12-14 00:00:00.0]]></pubDate>
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<title><![CDATA[Static Stability of Pump-Turbine in Turbine Mode]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1583.shtml</link>
<description><![CDATA[S-shape region is the major difference between pump-turbine and routine turbine, and is one of the key factors that cause pump-turbine stability problems. In this literature, derivatives of unit discharge Q11 and unit torque T11 to unit speed n11 have been deduced separately. Based on derivative characteristics of unit discharge Q11 and unit torque T11, and combining relationship between flow rate Q and working head H in turbine mode and reverse pump mode for specified guide vane opening, stability requirements for pump-turbine running in turbine mode and reverse pump mode have been proposed. Prerequisites of working head disturbance factor for stable running in turbine mode and reverse pump mode were obtained by employing static stability theory and then stable working point in turbine mode and S-shape region were defined. The research provides technical and theoretical supporting for pump-turbine stability analysis.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Fei,ZHU Baoshan, ZHONG Dalin, LI Dongkuo]]></author>
<pubDate><![CDATA[2018-12-13 00:00:00.0]]></pubDate>
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<title><![CDATA[Fault diagnosis of hydroelectric generating set based on multi-dimensional features and multiple Classifiers]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1582.shtml</link>
<description><![CDATA[A fault diagnosis method of hydroelectric generating set based on multi-dimensional features and multiple classifiers is proposed. The multi-dimensional features are constructed by extracting the time domain characteristics, frequency domain characteristics and sample entropy of the ensemble empirical mode decomposition of the vibration signals in different states. The multidimensional complementarity of the feature information is realized, and the multi-dimensional features are reduced by the genetic algorithm. With this multi-dimensional feature as the input of the classifier, the fault diagnosis is carried out by the support vector machine classifier, the back propagation neural network classifier and the naive Bayes classifier. The preliminary diagnosis results of the three classifiers are fused to get the final diagnosis conclusion, thus improving the accuracy of the fault diagnosis of the hydropower generating set. In order to verify the validity of the method, the rotor unbalance, rotor misalignment and rotor rubbing are simulated on the rotor test bench, and the method is used to diagnose the fault. The results show that the fault diagnosis accuracy of multi-dimensional features and multiple classifiers is higher than the single dimension feature and single classifier.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[CHENG Xiaoyi, CHEN Qijuan, WANG Weiyu, ZHENG Yang, GUO Dingyu, LOU Qiang]]></author>
<pubDate><![CDATA[2018-12-13 00:00:00.0]]></pubDate>
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<title><![CDATA[The influence of unfavorable structural planes on overall stability and abutment reinforcement]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1581.shtml</link>
<description><![CDATA[The abutment stability is the most important issue relating to the overall stability of the high arch dam. It is of great significance to adopt reinforcement measures for unfavorable structural planes to guarantee the overall stability of the high arch dam. Under the complex foundation conditions, the unfavorable structural planes usually have a potential influence on the overall stability of high arch dams, such as wedge stability at abutment, uncoordinated deformation and force transmission due to faults and weak belts. Combined with practical engineering, the overall stability of high arch dams is analyzed under the condition of natural and reinforced structural planes based on results of the geomechanical model test and nonlinear finite element method. Four typical groups of structural planes at abutments of high arch dam and reinforcement measures are further summarized. The research results could be beneficial for stability analysis and reinforcement design for similar high arch dams. The research results could be beneficial for stability analysis and reinforcement design for similar high arch dams.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Lin Peng, Shi Jie, Ning Zeyu, Peng Haoyang]]></author>
<pubDate><![CDATA[2018-12-10 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on strain energy conversion properties of sandstone after freezing-thawing cycles under triaxial confining pressure unloading]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1580.shtml</link>
<description><![CDATA[In order to investigate the mechanical properties of sandstone in cold region tunnel under unloading conditions, based on freezing-thawing cycles test and triaxial unloading test, the stress-strain properties and strain energy conversion properties of sandstone was studied. With the increasing freezing-thawing cycles, the peak strength in the unloading yield process is significantly reduced and the strain changes gently. The strain energy variation process can be divided into four stages. During the pre-peak unloading process, the strain energy due to axial pressure is mainly converted into elastic strain energy, and the damage caused by the freeze-thaw cycle exacerbate this process. After the stress peak, the stored elastic strain energy is rapidly released, and the dissipative energy due to plastic deformation and damage is rapidly increased. The strain energy consumed by circumferential deformation increases rapidly. The failure mode of the specimen shows obvious tensile failure characteristics. With the increasing freezing-thawing cycles, the number of tensile cracks increases and the particle breakage becomes more pronounced. It is of great significance to reveal the law of damage and failure of frozen rock in unloading.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[NI Xiaohui,SHEN Xiaomei, HUA Xinruo, FANG Jian]]></author>
<pubDate><![CDATA[2018-12-10 00:00:00.0]]></pubDate>
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<title><![CDATA[Hydrological Effects and Stormwater Control Effects of Urban Typical LID Measures]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1579.shtml</link>
<description><![CDATA[The rapid development of urbanization has aggravated the problem of urban waterlogging and water pollution. Taking a residential area in Jizhou District of Tianjin as the research area, the SWMM model was established on the basis of its planning scheme and the physical experiment of permeable pavement. The runoff control effects of 7 planning schemes for different rainfall events was simulated, and the feasibility of using a natural drainage system instead of a rainwater pipe network in a certain area and the runoff control effect of separate permeable pavement, depressed green, vegetative swale, bio-retention facility and combined LID scheme, was analyzed. The results indicate that it is feasible to complete the convergence through permeable pavement etc., and can achieve better control effect. LID measures can reduce the total runoff, flood peak flow, water accumulation, and delay the peak time, and the control effect is more significant in low return period and short duration rainfall. Among them, the combined LID scheme has the best control effect, permeable pavement and bio-retention facility have the most significant effect on the reduction of flood peak flow, and the stormwater control effect is poor when the vegetative swale is laid separately.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Man, ZHOU Keke, ZHANG Ting, LI Jianzhu, FENG Ping]]></author>
<pubDate><![CDATA[2018-12-07 00:00:00.0]]></pubDate>
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<title><![CDATA[A Roughness Calculation Method Based on Resistance Characteristics]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1578.shtml</link>
<description><![CDATA[Bed roughness (KS) is the leading factor in the calculation of sand grant resistance, which is a useful significance for the research of velocity distribution, bed-load movement, and sediment transport rate. Based on the resistance characteristics and comprehensive consideration of water and sediment conditions, the calculation formula of bed surface roughness based on sediment median grain size, non-uniform coefficient, hydraulic radius and bed slope is established, its research mechanism is more reasonable than that of the previous ones. After verification of measured data and comparison of mean square error with other scholars' calculation methods, it was found that the accuracy of KS calculation method based on non-uniform sediment was significantly higher than that based on uniform sediment. The formula in this paper is applicable to both the calculation of uniform sediment roughness and non-uniform sediment roughness, and the calculation accuracy is significantly higher than that of other scholars.The effect of sand wave on the accuracy of the formula is smaller than that of sediment transport.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[CHEN Xuebiao,ZHANG Genguang,WANG Yule,ZHOU Shuang,LIU Yu,XU Xiaoyang]]></author>
<pubDate><![CDATA[2018-12-07 00:00:00.0]]></pubDate>
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<title><![CDATA[PIV Experiment and Numerical Simulation on the Characteristics of Residual Air Mass in Water Pipelines]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1577.shtml</link>
<description><![CDATA[In order to study the influence of the water flow velocity of the pressurized water pipeline and the pipeline angle of the local top-part on the motion characteristics of the local top part residual air mass, a local top part stagnant air mass experimental platform for the pressurized pipeline was constructed, and the Particle Image Velocimetry (PIV) measuring system was adopted. The flow velocity at the local top-part is measured. Combined with the RSM turbulence model combined with the VOF multiphase-flow model, a local top-part gas-liquid two-phase fluid dynamics model is constructed to simulate the flow velocity, took into consideration of the influence by local top-part angle and air mass volume. The results show that with the increase of water flow velocity, the local top-part residual air mass presents three states, namely, no bubble generation, air bubble was generated and partial discharged, and air mass discharge at one time; if other conditions are the same, if the gas is greater than a certain volume, the increase in the water flow rate required to carry the air mass out of the local top-part at one time will slow down.; the larger the local top-part angle, the greater the water flow speed required to carry the gas out of the local top part at one time.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HUANG Haocheng, CHEN Qi, JIANG Jin, LIAO Zhifang, LIU Laiquan, TAN Kai]]></author>
<pubDate><![CDATA[2018-12-04 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on earthwork allocation model based on Q learning algorithm and its application]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1576.shtml</link>
<description><![CDATA[Earthwork allocation is an important problem in the design and construction of water conservancy and hydropower projects. The traditional methods include linear programming, large-scale system decomposition and coordination, dynamic programming and so on, which have certain limitations. This paper attempts to solve the problem of earthwork allocation by using discrete Q learning in reinforcement learning. In this paper, the construction and solution of Q-learning model for earthwork allocation problem are discussed, and the feasibility of the proposed method is verified by an engineering example. It laid the foundation for subsequent research on the balance of dynamic earthwork allocation by reinforcement learning.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Renchao, LI Zongwei]]></author>
<pubDate><![CDATA[2018-12-03 00:00:00.0]]></pubDate>
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<title><![CDATA[Research on the meso-scale damage of concrete using CT image and K-Means clustering algorithm]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1575.shtml</link>
<description><![CDATA[ There is no obvious grayscale feature in the mesoscopic damage area of concrete CT image, and the image segmentation method based on threshold or edge detection is difficult to extract mesoscopic damage information. In this paper, K-Means clustering algorithm is proposed to deeply excavate the mesoscopic damage information contained in CT images. Firstly, the uniaxial static compression test was carried out on the concrete cylinder specimen. Then, the optimal cluster number was determined according to the outline coefficient. K-Means clustering algorithm was used to look for the optimal partition of CT image in the non-supervised state and the partition map containing mesoscopic damage information was obtained. Finally, the degree of damage was calculated by counting the total number of pixels in the damage area. The results showed that the evolution of mesoscopic damage in concrete was observed intuitively from the failure zone and mesoscopic damage zone map in each stress stage. The degree of mesoscopic damage has regularity with the change of stress, namely before peak load, mesoscopic damage experience relatively stable period and stable development period. After peak load, the damage experiences an unstable development period, which was reflected in the reduction of damage degree. It was proved that K-Means clustering algorithm has obvious advantages in analyzing the damage evolution of concrete.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHU Lin, DANG Faning,DING Weihua,ZHANG Le]]></author>
<pubDate><![CDATA[2018-12-03 00:00:00.0]]></pubDate>
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<title><![CDATA[The study of seepage parameter inversion based on Bayesian theory and entropy-blind number]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1574.shtml</link>
<description><![CDATA[The existing parameter inversion methods based on Bayesian only consider the randomness of the inversion process, neglecting the grey and unascertained uncertainties of seepage parameters. In this paper, an inversion method for seepage parameters based on Bayesian theory and entropy-blind number is proposed. The method introduces entropy-blind number theory into the inversion model, taking the parameters to be inverted as blind numbers, and fully considering the uncertainty in the inversion process; The differential evolution adaptive Metropolis (DREAM) algorithm is used to deduce the posterior distribution of seepage parameters. The response surface model is adopted instead of seepage numerical simulation forward model, avoiding a large number of forward models in the traditional Bayesian seepage parameter inversion method. The validity and accuracy of the proposed method are verified by example analysis and the permeability coefficient inversion of a concrete gravity dam foundation.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LV Peng, WANG Xiao-Ling, WU Bin-Ping,CHENG Zheng-Fei]]></author>
<pubDate><![CDATA[2018-12-01 00:00:00.0]]></pubDate>
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<title><![CDATA[Comparison of parameter estimation methods for Exponential Gamma Distribution]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1573.shtml</link>
<description><![CDATA[In view of the superiority of exponential Gamma distribution in hydrological frequency analysis, the application of 6 common parameter estimation methods under this distribution is discussed. Based on the flood data of Ankang, Huazhu, Linjiang, Pengshui, Shanxi and Wusheng, the annual maximum flood peak series taking account of historical data are calculated. Under the 6 methods of optimized line fitting method, moment method, mixed moment method, linear moment method,maximum likelihood method and ordinary entropy method based on maximum entropy theory,the statistical performance and the precision of design values are analyzedusingtheMonte Carlo simulation. And the fitting of the Exponential Gamma distribution is discussed. The AIC criterion and the RMSE are used as the evaluation criteria to evaluate the fitting effect. The results show that the optimal fitting method and the linear moment method have achieved ideal fitting effect in flood frequency analysis, and the general entropy method can be used as a contrast method for the linear moment method in flood frequency analysis in order to obtain a better result. The parameter estimation method in this paper will provide support for hydrological frequency calculation in China.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LI Hang, SONG Songbai, SHI Jihai]]></author>
<pubDate><![CDATA[2018-12-01 00:00:00.0]]></pubDate>
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<title><![CDATA[Influence of combined protection of surge shaft and pressure reducing valve on transient of long distance diversion pipeline hydropower station]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1572.shtml</link>
<description><![CDATA[Based on the hydraulic calculation of characteristic line method and one-dimensional transient flow theory, the mathematical models of the surge tank and the pressure reducing valve are established respectively, which are applied to the hydropower station with long distance diversion pipeline. According to the working principle of the surge shaft and the pressure reducing valve, combined with the control requirements of the unit speed increase rate and the maximum pressure of the volute during the load rejection of all units, it comes to the conclusion that compared with the method of the single surge shaft, the combination of the single surge shaft and the reducing valve can significantly and effectively reduce the maximum pressure at the end of the volute and the rate of increase of the unit speed. On this basis, the influence of the selection of the pressure reducing valve on the operation safety is analyzed. Combined with the numerical calculation result, the opening and closing rules of the pressure reducing valve and the principle of valve diameter selection are determined. The result of numerical simulation provides a reference for the selection of the model of similar waterway pressure reducing valve on hydropower station.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Xiaoying, ZHANG Jian, ZHOU Tianchi]]></author>
<pubDate><![CDATA[2018-11-29 00:00:00.0]]></pubDate>
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<title><![CDATA[Time-domain analysis of tunnel-layered soil based on doubly asymptotic transmitting boundary]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1571.shtml</link>
<description><![CDATA[Developed from modified scale boundary finite element method and continued fraction solution, high-order doubly asymptotic transmitting boundary realizes time localization and achieves stiffness matrix converging rapidly to the exact solution through the whole frequency range, possessing high accuracy and good efficiency. This paper applies this transmitting boundary to propagation of elastic wave in complicated layered soil. Also, combining with FEM, a time-domain coupled model is built to study dynamic response of tunnel-layered soil system. The coupled model is divided into near and far field by the transmitting boundary, of which the near field is modelled by FEM while the far field is modelled by the high-order doubly asymptotic transmitting boundary. The proposed coupled model is studied by numerical examples. The results demonstrate that the solution of the coupled model is stable and agrees well with the solution of extended mesh solution, gaining well balance of accuracy and efficiency. Besides, it also has shown the fitness for long-time seismic response analysis of tunnel-layered soil interaction. Therefore, it is believed that the coupled model could provide a new approach for seismic analysis of tunnel-layered soil interaction and could be further developed for engineering.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHENG Siyuan, LIU Tingjin, TANG Xinwei]]></author>
<pubDate><![CDATA[2018-11-29 00:00:00.0]]></pubDate>
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<title><![CDATA[Numerical prediction of flood discharge atomization induced by complicated aerial collisions]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1558.shtml</link>
<description><![CDATA[To predict the flood discharge atomized characteristics of high dam induced by complicated aerial collisions, a numerical method was proposed with plane-facade collision modes, considering feature information of atomized source and atomized rainfall fields, which was applicated in engineering practice based on Xulong Hydropower Station. For the applicated project, the model's calculations show the design of jet buckets is correlated with the distribution of atomized sources and atomized rainfall. The atomized heavy rain domains of optimal type Ⅱ vary under the flood reoccurrence period of 5000 years and 100 years coupling with adverse wind, whose longitudinal protective boundary of the of the former condition is increased by 50m to the downstream with pile number 0+895m, and the maximum protection elevations on the left and right bank are increased by 9m and 13m, which exceeding the dam crest elevation by 69m and 55m respectively. The atomized heavy rain domains of optimal type Ⅱ include basic and verification protection standards affected by adverse wind and rain, whose longitudinal ranges are 0+(-3m)~0+862m and 0+(-9m)~0+938m, whose left elevations are 2382m and 2391m, and whose right elevations are 2370 and 2371m. Such research results can provide references for the impact assessment and protective decision of related atomized engineering.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LIAN Jijian, LIU Dan, LIU Fang]]></author>
<pubDate><![CDATA[2018-11-22 00:00:00.0]]></pubDate>
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<title><![CDATA[Variation and correlation of pollutants in water and sediments in sponge campus]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1557.shtml</link>
<description><![CDATA[Peiyang Park campus of Tianjin University is a pilot campus of sponge campus construction. This paper focused on the variation of pollutants in the water and sediments of the artificial water system in Peiyang Park campus of Tianjin University. The correlations of pollutants in water and sediments were also analyzed by the correlation coefficients and the determination coefficients of multiple regression. Results showed that the pollutants concentration in water of artificial water system in Peiyang Park campus is mainly determined by the pollution source and water mobility. Lower concentration of contaminants in water were observed in summer, and higher concentration of contaminates in water were observed in winter. The main contaminants monitored in water were nitrogen (total nitrogen is ranged from grade IV to worse than grade V, ammonia nitrogen is ranged from grade III to grade V) and chemical oxygen demand (COD is ranged from grade IV to worse than grade V). But no significant seasonal fluctuation was observed to the contaminants in sediments of artificial water system in Peiyang Park campus. The main contaminants monitored in sediments were nitrogen (total nitrogen is ranged from 0.1 to 17.1 mg/kg and ammonia nitrogen is ranged from 0.6 to 4.7 mg/kg) and chemical oxygen demand (COD is ranged from 26.9 to 190.4 mg/kg). In addition, the sum of determination coefficients of contaminates concentration in water and sediments are larger or smaller than the determination coefficients of contaminates concentration of whole water system (contaminants concentration of water + contaminates concentration of sediments). This indicates that contaminants in artificial water system in Peiyang Park campus are effect by the water and sediments together, and significant correlations are existing between the contaminates in water and in sediments.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HOU Jie, SUN Qiu-hui, GUO Qi-zhong, KANG Hong-zhi, WANG Hui-qi, LIU Xun, ZHU Kai-xuan, CHEN Liang]]></author>
<pubDate><![CDATA[2018-11-22 00:00:00.0]]></pubDate>
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<title><![CDATA[Research and application of superficial insulation of Xiluodu super high arch dam concrete]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1556.shtml</link>
<description><![CDATA[The deep cracks and penetrated cracks are developed from surface cracks which is the majority type in the dam concrete cracks, therefore, the surface insulation is the important measure to prevent concrete surface crack. In the construction of Xiluodu super high arch dam, the systemic researches about the dam insulation scheme are conducted, which include the determination of technical standards, simulation analysis, construction scheme optimization, and the standard process research and so on. Based on the research, the personalized and fine insulation processes are proposed to meet the need of surface insulation of the super high arch dam concrete. Through the site omni-directional real-time monitoring and quality inspection, the results show that the insulation effect of the Xiluodu arch dam is significant, and the risk of cracking on the concrete surface is effectively controlled.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[FAN Qixiang, WU Kun, CHEN Wenfu]]></author>
<pubDate><![CDATA[2018-11-19 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on the method of determining acceptable risk level of dams]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1555.shtml</link>
<description><![CDATA[The F-N curve is a kind of intuitive curve to describe the relationship between risk frequency (F) and consequence (N). It is often combined with ALARP (as low as reasonably practicable) criterion to determine the acceptable level of social risk. There are some problems in the current method, such as lack of theoretical basis, strong subjectivity, and poor generality for different regions and risk categories. This paper proposes an improved F-N curve combined with risk matrix. Risk criteria are integrated into risk matrix and a method of combining qualitative and quantitative classification is proposed to determine risk levels of risk units. Based on this method, the F-N curve is transformed from the risk matrix. On the basis of the study of acceptable risk level of dams, the concrete implementation process of this method is expounded, and the differences and relations between the traditional and proposed methods are analyzed and compared. The results show that the improved F-N curve is more standardized and reasonable than the traditional curve, and is easy to be popularized and applied to other types of risks.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Liping, LI Ningning,MA Haoyu, Zhang Yanke, JI Changming]]></author>
<pubDate><![CDATA[2018-11-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Review on the Application of UAV-based Photogrammetry in Urban Flood Modeling]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1554.shtml</link>
<description><![CDATA[In view of the severe situation of urban floods in China and the current development of flood simulation models, it is pointed out that elaborate urban flood simulation is a focus in the future. The data acquisition method based on low-altitude UAV-based photogrammetry can provide high-resolution ground information and flooding extent of the city and build complete data foundation. By summarizing the related technical indicators and application examples of UAVs, it is pointed out that UAV-based photogrammetry has the advantages of obtaining large-scale and easily updated data with relatively lower costs, hence is widely applied in many fields. Moreover, data like land use, topography and flood extent provided by UAV photogrammetry can make for the model development. In addition to that, technologies like three-dimensional model and monomer model can serve the purpose of better digitalization and refinement of the flooding process simulation and result display. Although the application of photogrammetry technology in flooding simulation has some problems, it has a good application prospect with the improvement and development in further application.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[CHENG Tao, XU Zongxue, HONG Siyang, WANG Zhonghua]]></author>
<pubDate><![CDATA[2018-11-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Coupled fluid-solid analysis of the observation gallery in Rumei dam with multi-body contact]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1553.shtml</link>
<description><![CDATA[The multi-body contact problems with seepage are common in hydraulic engineering. However, traditional joint element-based methods exist many shortcomings. In this paper, we developed a new contact algorithm with consolidation using Lagrange method to fulfill the pore pressure continuity condition on contact interface, based on computational contact mechanics and fluid-solid coupling. This algorithm was applied to the stress-deformation analysis of the observation galleries in the earth core of Rumei dam. The numerical results show that the new algorithm is capable of handling the non-conforming meshes. It can effectively solve the enormous difficulties in mesh generation due to the complicated 3D form of the observation gallery and the significant size difference between the gallery blocks and the dam body. The calculated results of displacement of galleries are reasonable, and the discontinuous deformation behaviors such as separation and sliding between the gallery blocks are captured. Furthermore, the results give a more precise and reasonable stress distribution in the blocks because of the local refinement of gallery mesh.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Wei, ZHAN Ling, ZHANG Bingyin]]></author>
<pubDate><![CDATA[2018-11-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Hydrodynamic performance analysis of vertical axis helical triangular blade]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1552.shtml</link>
<description><![CDATA[ In order to improve the stability of the energy output of the vertical axis water turbine, a runner with helical triangular blade was introduced to replace the traditional straight blade H-type runner. In this paper, four helical triangular blade were designed by changing the helical warp angle as 15°, 30°, 45° and 60° at half of the blade height. Then, based on the computational fluid dynamics analysis method, the influence of the helical warp angle on the hydraulic performance of the helical triangular blade was studied. Based on the result, it can be found that the power coefficients of the runner was improved after the helical triangular blade was applied. And the most obvious improvement of power coefficients was found at the large tip speed ratio operating condition. Meanwhile, the greater the helical warp angle, the more stable the power output of the runner. After comprehensive comparison, the runner with 15° helical warp angle has the best performance. It's maximum improvement of power coefficients had reached 13.4% and the stability of energy output also be improved. In addition, by comparing the vorticity field between the initial and modified runner, it can be found that the helical triangular blade effectively reduces the range of the wake vortex of the blade. And the amplitude of pressure fluctuation on blade surface also be reduced. All of these indicates that the helical triangular blade are conducive to the improvement of the operation stability of the vertical axis water turbine. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHU Guojun, JING Xinxin, FENG Jianjun]]></author>
<pubDate><![CDATA[2018-11-09 00:00:00.0]]></pubDate>
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<title><![CDATA[Dynamic update of diversion tunnel construction simulation parameters based on ACDE-SVM]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1551.shtml</link>
<description><![CDATA[Update of construction simulation parameters has great impact on the accuracy of the simulation results. Most of the proposed researches use Bayesian theory to update the simulation parameters, with the assumption of the parameter probability distributions. Moreover, this method cannot output the series of predicted parameters to describe the dynamic variation of parameters. To solve this problem, this paper proposed a schedule simulation parameters update method for diversion tunnel construction, based on the adaptive chaos differential evolution-support vector machine (ACDE-SVM). First, ACDE algorithm is proposed, with the improvement by adaptive scaling factor and chaos theory. ACDE not only can reduce the searching time, but also can overcome the shortcoming of the differential evolution that can easily become premature. Second, this paper optimizes the SVM parameters using ACDE based on the time series of onsite parameters. Then, ACDE-SVM algorithm is proposed to predict the simulation parameters, which overcomes the inefficiency of selection and weakness of generalization capability. Last, some error indices is used to evaluate this method, in comparison with the conventional simulation and Bayesian method to prove the consistency and superiority. The case study shows that this method can fit the trend of the parameter, so that the accuracy of simulation can be increased.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[XIAO Yao, ZHONG Denghua, WANG Dong, LIN Weiwei, WANG Jiajun, LIU Zhen]]></author>
<pubDate><![CDATA[2018-11-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on the influence of humidity on the stress and deformation of concrete simply supported beams]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1550.shtml</link>
<description><![CDATA[The swelling deformation of concrete in contact with water inevitably causes changes in the performance of the concrete structure. The humidity diffusion model is established based on Fick's second law. The saturated humidity diffusion coefficient is determined by physical test. The rationality of the model is verified by the one-dimensional water absorption test of concrete. Taking the one-dimensional free water absorption of concrete simply supported beam as an example, the mechanism of the influence of humidity on the deformation of the beam are studied by experimental and numerical simulation methods.the effects of the elastic modulus and the swelling effect of the concrete on the deflection and section strain of the beam and the effects of the combined effects on the beam stress are studied based on numerical simulation results. Studies have shown that the models and parameters could be used to simulate the nonlinear distribution of humidity well in beams. The deflection and strain change of the beam are less affected due to the change of the elastic modulus of the humidity, However, the deflection and strain of the beam caused by the swelling of the water and the combined effect of the two have a greater influence on the stress of the beam. For concrete structure that are in directly contact with water, it is necessary to consider the effects of humidity on the structure during design.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[YANG Le, LI Zongli, YAO Xiwang，DU Xiangqin]]></author>
<pubDate><![CDATA[2018-11-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Water hammer protection for long-distance water supply projects with special terrain conditions]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1549.shtml</link>
<description><![CDATA[In the long-distance water supply project, the pipeline is generally arranged according to the topographic. In view of some special topographic conditions of water supply projects, in this paper, a water hammer protection scheme combined with air vessel and outlet overflow tank was proposed, and a mathematical model of the overflow tank was established. For a fixed parameters of the air vessel, a theoretical formula for calculating the cross-sectional area of the overflow tank was given, which effectively reduces the blindness and workload in the initial selection of the overflow tank parameters. A comparison was performed of the water hammer protection performance between combined protection of air vessel and overflow tank and pure air vessel protection based on a practical water supply project. The results showed that the combined protection scheme of air vessel and overflow tank had a better protective performance in long-distance water supply projects, which has a large slope in front and a small slope behind. In addition, the protective effect of negative pressure improves with the increase of the overflow-level of overflow tank.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[SHI Lin, ZHANG Jian, NI Weixiang, CHEN Xuyun, LI Min]]></author>
<pubDate><![CDATA[2018-10-30 00:00:00.0]]></pubDate>
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<title><![CDATA[The Critical hydraulic Conditions of Jet-Rotary Joint Cascade Inner Energy Dissipator]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1548.shtml</link>
<description><![CDATA[ In order to obtain the critical hydraulic conditions for a new type of cascade inner energy dissipator united with submerged jet tunnel and horizontal rotary flow tunnel, model test and theoretical analysis were employed to study the pressure characteristics of the jet-rotary joint cascade inner energy disspator. The results show that, when the depth of water at the top of the jet tailrace hole in the shaft increased to 0.2 times of the tailrace hole diameter, a bistable operating flow regime composed of a stable submerged jet and a stable horizontal rotary flow can be formed in the energy dissipator. Both in the submerged jet section and horizontal rotary section, the pressure along the tunnel showed an obvious graded and segmented characteristics. The maximum relative pressure difference for the jet section and rotary flow section were 0.75 and 0.72, respectively. The jacking pressure of the submerged jet orifice increased linearly with the increase of the water depth of the shaft. The relative jacking pressure of the rotary flow generator orifice were controlled by the Froude number of the rotary flow generator orifice, the Froude number of the barrage orifice as well as shaft and downstream water level difference, and linearly decreased with the increase of the three. Taking the Froude number of the jet orifice and the jacking pressure of the rotary flow generator orifice as the upstream and downstream hydraulic conditions, the critical hydraulic conditions that the cascade energy dissipator needs to meet in the bistable operating flow state were given. The results can provide optimization, theoretical basis and engineering application of the jet-rotary joint cascade inner energy dissipator.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[DENG Yuchen, NIU Zhengming, LI Qilong, NAN Junhu, WANG Tianshi]]></author>
<pubDate><![CDATA[2018-10-30 00:00:00.0]]></pubDate>
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<title><![CDATA[Reliability Analysis of Foundation Stability Against Sliding of Gravity Dam Based on PLS-ELM Dynamic Response Surface Method ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1534.shtml</link>
<description><![CDATA[In the reliability analysis of foundation stability against sliding of complex gravity dams, the number of random variables and the nonlinearity of implicit performance function are large, so the traditional response surface method is difficult to converge with low precision and large amount of structural calculation. To solve this problem, a PLS-ELM (Partial Least Squares coupled with Extreme Learning Machine) dynamic response surface method was proposed to estimate the reliability index of dam foundation stability against sliding. The response surface of implicit performance function was constructed by Extreme Learning Machine (ELM), which was suitable to deal with high-dimensional, small-sample, nonlinear regression problems. The number and input weights of hidden layer neurons were optimized by Partial Least Squares (PLS), and the response surface of the model was combined with the Monte Carlo simulation method. The dynamic update of response surface and the solution of reliability index were realized by constructing a reasonable iterative method. On this basis, the reliability index of a practical dam foundation stability against sliding was calculated. The results show that the method has the advantages of less structural calculation, high fitting accuracy and efficiency of response surface, easy convergence and wide applicability, and it is easy to be combined with various structural calculation methods and software. It is suitable for the reliability analysis of dam foundation stability against sliding in practical projects;  The reliability index of dam foundation stability against sliding in engineering example is 5.10, which meets standard requirements; The material parameters of soft interlayer have the greatest influence on the reliability of dam foundation stability against sliding.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Xiaoling, LI Xiao, ZHU Xiaobin, LIU Minghui, WANG Jiajun ]]></author>
<pubDate><![CDATA[2018-10-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Research of Sector Water Right Allocation in Reservoir Based on the Allocation of Reservoir Assets ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1533.shtml</link>
<description><![CDATA[ The allocation of water rights is the key to the registration of water resources and the foundation for the realization of market allocation of water resources. Based on the theory of property rights economics, the property rights subjects and the allocations of reservoir’s water resources assets, reservoir project assets, and aquatic ecologic space assets were studied, then the property rights subjects and the allocations results of the reservoir assets were put into the sector water rights distribution system, and the method of determination of water resource use right quantity of the reservoir’s jus in re propria and jus in re aliena, and the method of sector water right allocations were put forward. The results show that the incorporation of reservoir property rights and asset allocation theory into the allocation system of sector water rights conforms to the basic principles of property rights economics, which is beneficial to the protection of the legitimate rights and interests of all investors in the reservoir construction, and is a useful exploration to guide the registration of natural resources in China. The allocation of reservoir’s sector water right quantity is beneficial to promote the construction of water resources property right system with clear power and responsibility. At the same time, it can provide the basis for the water administration departments to carry out the approval work of water intake permits for different sector users.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Wang Helong, Li Qifeng, Wen Jinhua, Wang Shiwu]]></author>
<pubDate><![CDATA[2018-10-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Dam overtopping risk rate estimation based on Copula function]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1532.shtml</link>
<description><![CDATA[Flood overtopping risk rate estimation is of great significance for reservoir operation and dam safety management. This paper focuses on estimating flood overtopping risk rate based on Copula function and analyzing the effects of the selection of different Copula functions and the correlation between flood peak and volume on the flood overtopping risk rate. The application of the Geheyan Reservoir in Qingjiang River basin shows that the optimal Gumbel-Hougaard Copula function describes the upper tail dependence between the flood peak and volume well, and the corresponding flood overtopping risk rate is 3.79 10-5, while Frank and Clayton Copula functions underestimate the risk rate significantly. It is also demonstrated that the overtopping risk rate is increased as the correlation coefficient of flood peak and volume increases and underestimated in the independence case, while overestimated in the full dependence case. The bivariate statistical approach based on copulas can effectively capture the actual dependence between flood peak and volume, which leads to more reasonable overtopping risk rate results and provides scientific basis for flood overtopping risk analysis.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LIU Zhangjun, XU Xinfa, CHENG Jingqing, WEN Tianfu, ZHANG Fanping, XU Junkai]]></author>
<pubDate><![CDATA[2018-10-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Real-time evaluation of compaction quality of earth-rock Dam using fuzzy logic based on KM and AC-BFA]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1531.shtml</link>
<description><![CDATA[To counter the insufficient accuracy and robustness of compaction quality evaluation models in common use, this study establishes a novel real-time compaction quality evaluation model. A newly fuzzy logic based on kernel method (KM) and adaptive chaotic bacteria foraging algorithm (AC-BFA) is proposed to create the model, and, the input parameters of the model is consists of the material physical parameters of crushed material which are reflected by amplitude of the first harmonic and fundamental decomposed from the vibration signal, the characteristic parameters of material source and rolling parameters in the construction process. The engineering application shows that the proposed model has consistency and superiority compared with the commonly used compaction quality evaluation model, and show stronger robustness in noise data and abnormal data testing, moreover, the compaction quality real-time monitoring system embedded with the model can real-timely evaluate the compaction quality.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Jiajun, ZHONG Denghua, GUAN Tao, TONG Dawei, DENG Shaohui]]></author>
<pubDate><![CDATA[2018-10-10 00:00:00.0]]></pubDate>
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<title><![CDATA[Research on the measures to reduce tensile stress in the high asphalt concrete core wall]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1530.shtml</link>
<description><![CDATA[ In the traditional rockfill dam with asphalt concrete core wall, the core wall and dam shell are both straight. The core wall will produce deflection deformation under pushed by the horizontal water pressure. There are tensile stress in the core wall due to its axis elongation. The higher the dam, the greater the risk of the core wall producing tensile cracks. Based on the mechanism of the core producing tensile stress, two new types of dam for improvement measures are put forward, which are the types of dam with straight dam and cured core(SDCC) and curved dam and curved core(CDCC). The influences of the dam height and dam axis length on the deflection deformation and tensile stress of the core wall are researched by aid of the finite element calculation. And the improvement effect of the new types of dam is investigated. The results show that the higher the dam height, the longer the dam axis length and the larger the slope ratio of bank slope, the greater the tensile stress of the core wall. And the new types of dam have a good effect on reducing tensile stress of the core wall. The analysis of construction technique, construction period and economic cost shows that the new types of dam are feasible and have a good application prospect.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[DANG Faning, GAO Jun, YANG Chao, MA Zongyuan]]></author>
<pubDate><![CDATA[2018-10-10 00:00:00.0]]></pubDate>
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<title><![CDATA[Global sensitivity analysis of a hydro-turbine generator unit system]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1529.shtml</link>
<description><![CDATA[Sensitivity analysis of a hydroelectric generating system model has important significance for model correction and application. The analytical expressions of unbalanced hydraulic forces acting on the hydraulic turbine blades are proposed, playing a key role in linking the models of hydro-turbine governing system and hydraulic turbine generator unit. Based on this, a unified model of hydroelectric generating system is established. Sensitivity analysis of 27 parameters from this unified model is evaluated using Extended Fourier amplitude test method (Extended Fourier Amplitude Sensitivity Test, EFAST). The results are obtained about the generator angular velocity and the rotor centroid. Specifically, first, the generator angular velocity sensitive parameters include the unit self-adjustment coefficient, the penstock diameters at the runner inlet and outlet, turbine rated flow and main servomotor rated displacement. Second, the sensitivity parameters of the rotor centroid at horizontal deflection Shift are the mass eccentricity of turbine generator unit, the quality of the eccentric, self-adjustment coefficient, wheel entrance diameter, runner outlet diameter, and the diameter of the main runner entrance rated servomotor displacement; Third, there is an obvious difference between the interaction effects of the global sensitivity parameters and other parameters on vibration shift of X-direction and Y-direction. Finally, the sensitivity of vibration shift is stronger than the parameters of generator speed. Hence, when using the unified model to analyze the vibration evolution, the generator speed should be adjusted first, then the parameters.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Jie-sheng, XU Bei-bei, CHEN Di-yi, LI Huanhuan, ZHANG Jingjing]]></author>
<pubDate><![CDATA[2018-10-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Optimal adjustment of multi-year regulating reservoir year-end water level based on expert system ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1528.shtml</link>
<description><![CDATA[ Multi-year regulating reservoir year-end water level is a significant control variable 
coordinating current and future benefits. In the case of possible uncertain water inflow in the future, optimizing current year-end water level. The general framework of the expert system for end-of-year water level optimization has been constructed. By analyzing the formation model of year-end water level,
presenting the method of inference data source generation, the water level reasoning is realized in the interface machine. The empirical results of Tankeng reservoir show that the solution of expert system is close to the optimal solution, while there’s a small gap between this solution and the optimal solution, and indicators such as power supply stability and water resource utilization rate also reached a high level. This way is of practical value to guide the annual power generation plan of regulating reservoir for many years.
]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[XIA Zhiyuan, ZHONG Pingan, XU Bin,LIU Weifeng, WANG Jufen]]></author>
<pubDate><![CDATA[2018-10-02 00:00:00.0]]></pubDate>
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<title><![CDATA[Surge characteristics of gas-liquid two-phase centrifugal pump under part-load conditions]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1527.shtml</link>
<description><![CDATA[Gas-liquid two-phase centrifugal pumps are widely used in agriculture, water environment, nuclear industry and petroleum industry. Centrifugal pump perform most efficiently when operating under the single-phase flow conditions. However, the presence of gas causes head degradation, low efficiency and hydraulic performance. Surge is one of the most serious problems faced by gas-liquid two-phase centrifugal pumps. In this paper, the commercial software ANSYS CFX 16.0 was adopted to calculate the three-dimensional turbulent flow in a centrifugal pump with a middle and low specific speed impeller. We can find out from the results that the gathering image becomes more and more obvious, and the gathering area is bigger and bigger with the increase of the inlet gas volume fraction before the surge occurs. Subsequently, a large number of the gas gathered in the impeller channel, and even completely blocked the impeller passages, which known as surge phenomenon. In order to improve the hydraulic performance of the centrifugal pump under surging conditions, a cavity structure was applied to the centrifugal pump. The effects of cavity structure on the centrifugal external characteristics performance and internal flow field have been examined in detail. The results show that under small flow rate conditions, the cavity structure can improve the blade pressure distribution, and uniform gas phase distribution in the impeller channel, which effectively reduce the gas blockage of the centrifugal pump. The research shows that the cavity structure can not only balance the pump impeller and reduce the weight of the pump, but also reduce the phenomenon of gas-liquid separation in the flow field.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LUO Xingqi, YAN Sina, FENG Jianjun, ZHU Guojun, ZHANG Lefu, CHEN Senlin]]></author>
<pubDate><![CDATA[2018-10-02 00:00:00.0]]></pubDate>
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<title><![CDATA[Processes of hydrograph-based bank collapse of a highly sinuous bend in the lower Black River of Zoige Plateau]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1526.shtml</link>
<description><![CDATA[Bank erosion and collapse play an important role on sediment transport in alluvial channel and lateral migration of meandering river. The combination method of field measurement, discharge frequency analysis , and numerical simulation (BSTEM), based on the prototype of bank profiles, was applied to study bank failure process and bank toe erosion and collapse of a Ω-shaped bend of the lower Black River in Zoige Plateau under constant and variable discharge. The results indicate that bank erosion rate and retreat width are increased with the increase of the discharge under the constant discharge condition. While for each average discharge, the bank erosion rate and retreat width are similar and increased with the increase of the average discharge, which is independent of the shape, peak discharge, and dispersion of hydrographs under the variable discharge condition. It means bank erosion is affected by the magnitude of discharge and its frequency, and the erosion rate of bank toe and bank retreat width are mainly controlled by average discharge, rather than the shape of hydrograph and peak discharge. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[YANG Han-yuan, LI Zhi-wei]]></author>
<pubDate><![CDATA[2018-10-02 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on application of the quick-then-slow closure law for turbine wicket gates]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1525.shtml</link>
<description><![CDATA[The optimization for closure law of turbine wicket gates is an important research content of guaranteed regulation calculation in a hydropower station. Adopting reasonable closure law can reduce water hammer pressure and limit the unit speed, which is also an economic and effective measure. The thesis is based on a real hydropower station. The author established the mathematical model for the transition process of water diversion system, simulated the transition process under the control condition of hydropower station, and studied the influence of closure law of turbine wicket gates on water diversion system. The conclusion is that when quick-then-slow closure law of turbine wicket gates is applicable to the hydropower station where the extreme value of water hammer pressure and the extreme value of rotational speed are in different condition. Direct closure can’t meet the requirement of the guaranteed regulation calculation in this type of hydropower station, but the closure law in this thesis aims to solve this problem.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LI Min  ZHANG Jian  YU Xiaodong]]></author>
<pubDate><![CDATA[2018-10-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Numerical Study on the Effect of Waves on the Morphology Change during Storm Surge ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1524.shtml</link>
<description><![CDATA[A two-dimensional numerical model was developed for investigating the effects of wave on sediment transport and bed morphodynamics under different storm surge conditions. This work is based on an existing shallow water model coupling interactions between the flow, sediment transport and bed changes. The SWAN model was adopted to simulate the wave action, and the resultant wave radiation stress was further coupled into the existing sediment-flow model. Morphological changes of an idealized coast during different storm surge conditions are investigated and compared. It is shown that the effect of wave on the morphological change decreases with the increase of the storm tide level. When the storm surge is small, asymmetrical shoals are formed upstream and downstream of the tidal inlet, and a scour hole is formed at the entrance. When the storm tide is at a high level, the asymmetry of the formed shoals is small. The absolute error of morphology change calculated by the models with and without considering the wave action is approximately 5% when there is a high storm tide and the ratio of water depth to wavelength is less than 0.15, while the simulation time with the wave effects could be doubled. It is suggested that coupling waves and flows may be only important for low storm surge tides.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[XU Ludi, HE Zhiguo, PAN Jiajia, HU Peng]]></author>
<pubDate><![CDATA[2018-10-02 00:00:00.0]]></pubDate>
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<title><![CDATA[A preliminary study on the effect of characteristic flow rate on the formation and development of the ditch ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1523.shtml</link>
<description><![CDATA[There is often a ditch on the channel bar of branch river, which makes the activity of bar stronger and affects the stability of the river regime. The formation and development of ditch are mainly comprehensive responses to changing runoff flows. To explore the sensitivity of ditch to different flow rates, a depth-averaged two-dimensional hydro-sediment-morphodynamic model was used to study the the erosion and deposition process of the channel bar under different flow rates, and the formation and development of the ditch was numerically reproduced. Studies have shown that the formation and development of the ditch are closely related to the characteristic flow rate: 1) When the flow rate is small and the water cannot flow over the bar, the water flows through the left and right waterway of the bar, and the ditch won’t be generated; 2) When the flow rate is medium and the water just flows over the bar with a small water depth on the bar, the water exchange between the left and right waterway through the middle low-lying area on the bar happens and the ditch is generated. 3) When the flow rate is large and the channel bar is almost underwater, the water exchange between the left and right waterway is weakened, and the ditch cannot be generated. The research results also show that under different characteristic flow rates, the formation position of the ditch will swing. And the magnitude of the characteristic flow rates of the formation and development of the ditch will depend, to some extent, on the planar shape of the channel bar. For the study of the stability of the channel bar of branch river, the method and conclusion used here can be used as references.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LEI Yun-long, HU Peng,CAO Zhi-xian, LIU Huai-han, LI Wei]]></author>
<pubDate><![CDATA[2018-09-28 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on the hydraulic boundary eigenvalues of embankment breach based on cluster analysis]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1522.shtml</link>
<description><![CDATA[It is an important basis of the study to determine the hydraulic boundary eigenvalues of typical embankment breach before carrying out the research on the occurrence mechanism of embankment breach and the technology of repairing of breach. However, it is difficult to obtain the hydraulic boundary conditions of typical levee breach accurately with the few and incomplete measured data, due to the complexity and changeability of the actual levee breach. Based on more than 100 groups of domestic and foreign examples and test data of embankment/earth dam failure, the correlation between the hydraulic boundary eigenvalues of the breach was established based on cluster analysis approach, and the missing values were imputed after correlating and fitting. At the same time, the hydraulic boundary parameters and related equations of generalized typical breach are obtained through the statistical analysis of probability density of dimensionless eigenvalues of the breach. The analysis shows that the width of the breach is mostly in 20~100m, the water head of the breach is in 4~12m, the velocity of the breach is in 2~8m/s, and all of those distribution probabilities are in 64~71%. The probability density of both the width-to-depth ratio and the Froude number of the breach are subject to the normal distribution characteristics, and the distribution frequency of the width-to-depth ratio of 3~8 is about 55%, and the Froude number&rsquo;s of 0.4~0.8 is about 60%.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[MA Hongfu, SUN Dongpo, LIU Mingxiao, DONG Mingjia]]></author>
<pubDate><![CDATA[2018-09-28 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on the hydrodynamic performance of a tidal current ducted turbine]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1521.shtml</link>
<description><![CDATA[In order to improve the output power of tidal energy conversion turbine system, a new type of horizontal axis ducted turbine were studied using Reynolds-Averaged Navier Stokes (RANS)-CFD modeling power，load, cavitation, unsteady flow characteristic and effect of multi-duct. The experiments were carried out to validate simulation results. The studies show that the ducted turbine has higher output power and axial thrust than the bare turbine, and can maintain high output power within +/-30 degrees of yaw angles. Furthermore, the ducted turbine has non-cavitation and good unsteady flow characteristics under design conditions. For the multi-ducted turbines, the large attached duct can further improve the power and thrust of the turbine in the range of all TSRs, and as the angle of attack of attached duct increases, the power and thrust will further increased too. However, the small attached duct is not conducive to the power of the turbine. The research results support the optimal design of ducted turbine, which can be useful in compensating for energy shortage and preventing pollution.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[SONG Ke, WANG Wenquan, YAN Yan]]></author>
<pubDate><![CDATA[2018-09-25 00:00:00.0]]></pubDate>
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<title><![CDATA[Classification System of Sudden Water Pollution Accident in South-to-North Water Transport Project]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1520.shtml</link>
<description><![CDATA[ The Middle Route of South-to-North Water Transport Project is a big project that benefits the country and the people, and also an important measure of China's future energy development strategy. Based on the “Driving-Pressure-State-Impact-Responses” (DPSIR Model) framework, a classification and grading system for sudden water pollution accidents in the Middle Route of South-to-North Water Transport Project is proposed. Firstly, 16 indicators that can reflect regional driving force, pressure, state, influence and response are selected to construct the evaluation index system. And according to the characteristics of the indicators, they are divided into static system and dynamic system. Second, combining with the actual status of the Middle Route Project, the standardized assignment of the index is carried out. Then, the risk level of sudden water pollution accident is determined by the analytic hierarchy process and the model of social coordinated development. Finally, taking the S237 canal bridge as an example, the rationality of the classification system is described and verified.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LONG Yan, LEI Xiaohui, YANG Yilin, LI Youming]]></author>
<pubDate><![CDATA[2018-09-25 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on the foundation treatment of the spillway control section of the Qian Ping reservoir]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1506.shtml</link>
<description><![CDATA[After the foundation of the spillway control section of Qianping Reservoir is excavated to the foundation surface, the geological conditions and the geological prospecting data of the previous period vary greatly. After supplementary geological survey, the control section is located at the contact zone between anshan porphyrite and diabase, and the base plane is mostly located on the strongly weathered rock bed. The weathering degree of rock is deep, the weathering degree of diabase rock is not uniform, the maximum exposure depth of exploration point is 10.2 m, the nature of rock mass is uneven, the soft and hard phases are interphase, and there are some risks such as local stress concentration and uneven settlement. In order to solve the problems existing in the foundation of the control section, the foundation of the spillway control section is optimized by excavation and replacement concrete, anti-slide pile, reinforced concrete anti-slide slot and so on. To achieve the purpose of foundation treatment, but also for other projects to provide reference and reference.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LI Congshi，HUANGFU Zehua，PENG Guanghua，Tang Jianli]]></author>
<pubDate><![CDATA[2018-09-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Fuzzy Comprehensive Evaluation of Earth-rock Dam Compaction Quality Control Based on Real-time Monitoring]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1505.shtml</link>
<description><![CDATA[The traditional quality assessment method of earth-rock dam compaction bases primarily on controlling parameters during compaction and testing sampled spots at job site. Compaction parameters cannot satisfy requirement absolutely on entire surface. Moreover, same parameters may cause distinct compaction quality influenced by inhomogeneity of material property. The few testing samples usually cause unreliable representation of the compaction quality of the entire surface, and there also exist certain error of compaction value (CV) to evaluate the quality of dam compaction. With the application of real-time monitoring technology for dam compaction quality, compaction parameters and CV can be monitored dynamically. A fuzzy comprehensive compaction quality evaluation method considering compaction parameters and CV was proposed based on Dempster-Shafer evidence theory in this research. In addition, a concept of equivalent continuous weak area was proposed by means of density-based spatial clustering of applications with noise (DBSCAN) to ensure that no obvious continuous weak areas occurred in compacted surface, and weak area spatial distribution of compaction quality was evaluated quantitatively on that basis. Case analysis shows that the presented method can avoid one-sidedness of compaction parameters evaluation and CV evaluation effectively, comprehensiveness of compaction quality assessment was enhanced and a new way for quality controlling in earth-rock dam construction.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LIU Donghai, WU You]]></author>
<pubDate><![CDATA[2018-09-18 00:00:00.0]]></pubDate>
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<title><![CDATA[Underground caver construction simulation based on M5P-SVR failure prediction]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1504.shtml</link>
<description><![CDATA[The simulation of underground cavern group construction is an important means to analyze the construction process of underground caverns. It is difficult to achieve high-precision simulation calculation of slag transportation time for traditional simulation models, and there are some problems such as subjective and large error in quantifying the influence of transportation machinery failure on construction progress. This study proposed an underground caverns construction simulation model predicting this failure by M5P-SVR. This model includes the following two aspects: (1) The slag module in the traditional CYCLONE model was improved. The transportation simulation circuit was established to calculate the slag transportation time which improved simulation accuracy; (2) Some external factors was considered scientifically. Training rules of M5P model tree is simple but effective, and support vector machine regression (SVR) can effectively solve the nonlinear prediction problems which don’t have enough sample. Combining these two advantages, the M5P-SVR based transportation machinery fault prediction method was proposed. The cross-validation results showed that the method can effectively improve the prediction accuracy. Finally, the model was used to simulate the actual project and compared with the traditional method. The analysis results proved the effectiveness of M5P-SVR and verified the accuracy and superiority of the proposed simulation model.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHONG Denghua, LIN Hanwen, WU Binping, ZHAO Mengqi, YU Jia]]></author>
<pubDate><![CDATA[2018-09-17 00:00:00.0]]></pubDate>
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<title><![CDATA[ Multi-objective optimization of hydrological model based on runoff and snow ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1503.shtml</link>
<description><![CDATA[This study uses the HBV(Hydrologiska Byr?ns Vattenbalansavdelning) hydrological model to simulate snow and runoff in the area above Nuxia streamflow gauging station in Yaloo Zangbu River Basin. A multi-objective optimization method that considers runoff, snow depth, and snow cover area simultaneously is proposed to calibrate the parameters of the hydrological model and the results are compared to those considering only the runoff and snow depth. The results show that the HBV hydrological model based on measured runoff and snow depth data can simulate the runoff quite well, but the simulation of snow depth is poor. By adding snow cover area in the optimization, the hydrological model can accurately determine the snow and runoff in the basin. The simulation efficiency coefficient has also increased, indicating that changes in snow and runoff in the study area can be better predicted and simulated by the HBV hydrological model based on runoff, snow cover area, and snow depth data. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HE Keqi, GAO Chao, XIE Jingkai, XU Yueping]]></author>
<pubDate><![CDATA[2018-09-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Experimental study on the wave attenuation characteristics of rigid-flexible combined wavebreak forests ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1502.shtml</link>
<description><![CDATA[By studying the physical experiment in regard to water attenuation property of different wavebreak forests, a wavebreak forest combing rigid and flexible vegetation is founded. This combination is specific to rivers with seasonal and significant variation in water level and it seems to ensure a better wave-breaking performance of ecological revetment projects. Through integrating with the height of present wavebreak forests and measured water levels in Laolongkou reach, wave-breaking experiments with respect to four combinations of vegetation are carried out under eight different water levels respectively. Results show that, in different inflow conditions, significant changes of wave-breaking effect can be seen in single type, but improved and stable effect can be seen in combined type. The transmission coefficients of rigid-flexible combined wavebreak forests is under 58.04%. Vegetation has respective superiorities of water attenuation under different water levels, these advantages are utilized and integrated by combined type adequately. Therefore, such combined type provides better stability and the effect of water attenuation, making it more cost-efficient and reasonable to construct the wavebreak forests within rivers with wide range fluctuation of water level. Meanwhile, the analysis of wave attenuation features of rigid-flexible combined wavebreak forests based on physical experiment, can provide theoretical support for the design of ecological revetment projects within the rivers which have similar characteristic as Laolongkou reach.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHOU Yue，DONG Zengchuan，CAO Haijin， XU Wei, SUN Biao，REN Jie, WEI Yiming]]></author>
<pubDate><![CDATA[2018-09-12 00:00:00.0]]></pubDate>
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<title><![CDATA[Fault diagnosis for hydropower unit based on fractal and probabilistic neural network]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1501.shtml</link>
<description><![CDATA[The vibration signals of hydropower unit are non-linear and non-stationary. They are similar in different scales and are typical fractal signals. In this paper, the multi-fractal method is used to analyze the vibration signal of the unit, extract the generalized dimensional spectral features of the signal, and use the probabilistic neural network optimized by artificial fish swarm algorithm for fault diagnosis. A case study shows that the combination of multifractal and probabilistic neural network can accurately distinguish fault types. Compared with BP and RBF network, this method has higher diagnostic recognition rate and faster speed, and provides more reliable reference basis for unit operation and maintenance personnel. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LI Hui, LI Xintong, JIA Rong, LUO Xingqi, ZHAO Jixing]]></author>
<pubDate><![CDATA[2018-09-12 00:00:00.0]]></pubDate>
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<title><![CDATA[Evolution of Oases under Human Interference in Arid Northwest China ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1500.shtml</link>
<description><![CDATA[Heihe River Basin, Shule River Basin, Shiyang River Basin and the Tarim River Basin are the major inland river basins in Arid Northwestern China. In recent years, oasis changed rapidly due to the intensification of human activities. Base on the Land use data from 2002 to 2012, we explored the oases evolution process in each basin separately. Results shows that: (1) Oases in all the 4 basins are expanding during the entire study period in principle. (2) The WGW (woodland, grassland and waters) is relatively stable during the entire study period, while the socio-economic land is relatively unstable. (3) The gravity center of oasis moves downstream in Heihe River Basin, while the gravity center of oasis moves upstream in the Shule River Basin. (4) During the transformation between oasis and desert, grassland and woodland contribute more than other land use types. (5) During the transformation between WGW and socio-economic land, the transformation from WGW to socio-economic land dominates.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Yu-ding, ZHENG Hang, ZHAO Jian-shi]]></author>
<pubDate><![CDATA[2018-09-12 00:00:00.0]]></pubDate>
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<title><![CDATA[Drift velocity of non-uniform suspended sediment]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1499.shtml</link>
<description><![CDATA[ In natural rivers, suspended sediment are generally composed of non-uniform grains, and the non-uniformity plays a key role in sediment transport and fluvial processes. However, research on non-uniform sediment transport is always conduct without considering the interactions between particles in different grain sizes, and the non-uniformity effect on sediment suspension remains unclear. This paper presents the constitutive equation for drift velocity of non-uniform suspended sediment in order to elucidate the non-uniformity effect on sediment suspension. Firstly, on basis of two-phase flow theory, basic governing equations for flows and non-uniform sediment are developed, in which the particle-particle interactions between sediment in different grain sizes are included. And two-phase mixture equations for non-uniform sediment-laden flows are further developed to avoid the complex computation of interphase interactions. Secondly, for the closure of the two-phase mixture equations, drift velocity is introduced and its constitutive equation is developed. The constitutive equation of drift velocity reveals that the suspension of the non-uniform sediment can be attributed to influences imposed by the fluid turbulence, the sediment particles themselves, and more importantly, interaction between particles in different grain sizes, which is main difference from the research on uniform sediment transport. Finally, transport equations for the non-uniform sediment are developed based on the constitutive equation of drift velocity, and vertical concentration profiles of each grain size of sediment mixtures are obtained. The calculated concentration profiles are compared to experimental data, and well consistency is observed between the two. Comparison of the concentration profiles between Rouse formula, the uniform and the non-uniform formula is also presented. Result shows that when the concentration is relatively high and the variety of grain sizes is relatively large, the difference of the concentration profiles between the uniform and non-uniform methods becomes more distinct, and the particle-particle interactions play an important part in sediment suspension. The constitutive equation of drift velocity provides a theoretical way to essentially elucidate the effect of particle-particle interactions on suspension of non-uniform sediment.  ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[JIA Baozhen, ZHONG Deyu]]></author>
<pubDate><![CDATA[2018-09-08 00:00:00.0]]></pubDate>
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<title><![CDATA[Experimental study on the characteristics of open channel flow with submerged rigid vegetation ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1498.shtml</link>
<description><![CDATA[The aquatic submerged rigid vegetation can be found in a lot of water bodies, such as oceans, rivers, reservoirs, lakes and canals. The vegetation can cause great impact on the flow structure, scour and sediment of river bed, flood process and navigation. In order to exactly understand the impact of aquatic vegetation on water flow, it is necessary to carry out research for river flow with vegetation systematically. In this paper, the flow characteristics in a laboratory flume with aquatic rigid vegetation, which are replaced by glass rods, are measured by three-dimensional laser Doppler velocimeter(LDV). Four arrangements of the vegetation are designed, i.e. parallel arrangement with full-coverage, staggered arrangement with full-coverage, parallel arrangement with semi-coverage and staggered arrangement with semi-coverage, and four submergence values of the vegetation are set for each of the arrangements. The measured results are analyzed systematically and it is found that the density, arrangement and submergence of vegetation have closed relationship with water surface gradient, head loss, flow velocity, and turbulence intensity.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[SONG Yingting, JING Hefang, ZHANG Kai, HUANG Lingxiao, LI Chunguang]]></author>
<pubDate><![CDATA[2018-09-07 00:00:00.0]]></pubDate>
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<title><![CDATA[Influence on water temperature of the Lancang River by the Buyuan River’s discharge]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1497.shtml</link>
<description><![CDATA[In this research, a combined field experiment and modeling approach has been practiced so as to reveal the influence on the water temperature of the lower reach of the Lancang River by one of its main tributaries, the Buyuan River. Through continuous water temperature monitoring at the Yunjinghong hydro-station (on main stream), Man’an hydro-station (on the Buyuan River) and Guanlei hydro-station (on the main stream and downstream to the Buyuan River’s merging point), a trend that Guanlei’s water temperature is highly correlated to the temperature measured from Man’an hydro-station has been observed. Also, numerical model method has been practices so as to speculate the water temperature at the Guanlei from Nov. 2014 to Nov. 2015. By comparing the model result based on scenarios that with and without the Buyuan River, the influence of the Buyuan River’s discharge has been revealed. The study result suggests that, during Sept. and Oct. 2014, when the discharge of the Buyuan River is relatively high and the hydro-power plants at the upstream of mainstream of the Lancang River is in the impounding period, yet still lower than the mainstream water discharge and water temperature is relatively lower than the mainstream water temperature, the discharge of the Buyuan River could effectively lower the Guanlei’s water temperature by at most1 Degree Celsius. However, except that period, the water temperature at Guanlei is dominated by mainstream water temperature.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[JING Bo, WANG Fushan, SHEN Chen, LU Ying, NI Guangheng]]></author>
<pubDate><![CDATA[2018-09-06 00:00:00.0]]></pubDate>
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<title><![CDATA[Structural model test of high-pressure hydraulic tunnel under high geotemperature conditions ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1496.shtml</link>
<description><![CDATA[ To reveal the bearing characteristics of surrounding rock mass of hydraulic tunnels under the combined effects with high geotemperature and high internal water pressure, a large-scale structural model test of hydraulic pressure tunnel with high geotemperature gradient is carried out based on developing a similar material of complete and hard rock mass in multi-physical fields. The model test employed acoustic emission signal monitoring and location techniques, developed a new combined loading techniques of temperature load and internal water pressure, and conducted tests and analyses of dynamic evolution processes of temperature field, osmotic pressure field, acoustic emission, and fracture propagation. The test results show that compared to the condition without high geotemperature, the critical internal water pressure of surrounding rock mass of hydraulic pressure tunnel decreased obviously as hydraulic fracture occurring under high geotemperature conditions. Differing from a surrounding rock mass without the high geotemperature condition which only results in a few number of main fracture propagation, the surrounding rock mass of the pressure tunnel with high geotemperature possessed a complete evolution of induced fractures between the main fractures. The surrounding rock mass has an obvious coupling effect of Thermo-Hydro-Mechanical fields under high geotemperature conditions, and fracture propagation and increasing damage of the surrounding rock mass presented a discontinued step-like evolution character in the condition of constant water pressure. Under high in-situ stress conditions, locations of hydraulic fracture and propagation of cracks of the tunnel are influenced by lateral confining coefficient of in-situ stress.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[PENG Lifeng, SU Guoshao, HU Xiaochuan, QIN Zihua, HE Baoyu]]></author>
<pubDate><![CDATA[2018-09-04 00:00:00.0]]></pubDate>
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<title><![CDATA[Experimental study on deformation characteristics and shear strength of rockfill under freeze-thaw cycles]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1495.shtml</link>
<description><![CDATA[The freeze-thaw cycles are important issues affecting the safety of high earth-rock dams in severe cold regions. This paper describes the test results on the rockfill materials of Rumei project, a high core wall rockfill dam in Lancang River, Tibet. The freeze-thaw cycle tests were conducted by using the rockfill weathering test apparatus developed by Tsinghua University, and the direct shear tests were performed under different normal stress conditions. According to the test results, the deformation and strength characteristics of the rockfill materials during the freeze-thaw cycle were investigated. In a given freeze-thaw cycle, the rockfill samples will undergo three typical states: “thaw-shrinking”, “frost-shrinking” and “frost-heaving”. After the freeze-thaw cycle, the rockfill sample will have a large back expansion deformation, which will reduce the compactness and shear strength of the sample. After 20 freeze-thaw cycles, the shear strength of the sample will be reduced by about 11.5% to 15.4%.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[CHEN Tao, WANG Wei, YIN Yin, ZHANG Bingyin, SUN Xun]]></author>
<pubDate><![CDATA[2018-09-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Design and application of reservoir wireless video monitoring system based on 3D real scene modeling ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1494.shtml</link>
<description><![CDATA[In this paper, taking Qianping Reservoir as an example, wireless signal bridge transmission is used in the reservoir construction period video surveillance system, based on the UAV aerial photography generated three-dimensional real-time model video surveillance points and wireless bridge are designed.This paper introduces the aerial photographer's oblique photography using Dajiang UAV DJ1 PHANTOM4 PRO,and the process steps of using Context Capture 3D to generate 3D real scene models.The method of optimizing monitoring points layout, visual field and channel rechecking based on 3D real scene model is studied.Practice shows that the design of wireless video surveillance system for reservoir based on UAV 3D model is reliable and can be used for reference for other similar projects.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Zhaosheng,MA Shanyu,HUANGFU Yingjie LI Congshi,HUANGFU Zehua, ZHANG Yuming]]></author>
<pubDate><![CDATA[2018-09-02 00:00:00.0]]></pubDate>
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<title><![CDATA[Quantitative assessment the influence of parameter uncertainty propagation on runoff simulation]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1493.shtml</link>
<description><![CDATA[ Hydrological model is an important tool for simulating hydrological process. But the uncertainty of model parameters reduces the adaptability of simulation results. Therefore, the SWAT (Soil and Water Assessment Tool) model is taken as an example to quantitatively explore the influence of parameters uncertainty on runoff simulation by using factor analysis variance decomposition method. The results show that the influence of parameters uncertainty on runoff simulation is obviously different under different floods and the parameters uncertainty is larger in the lower flow than in the higher flow; the most sensitive parameters for the hydrological response are followed by the ratio coefficient of main channel flow into deep aquifer propagation loss, effective hydraulic channel conductivity and the saturated hydraulic conductivity of soil. The interaction effect between the ratio coefficient of main channel flow into deep aquifer propagation loss and the saturated hydraulic conductivity of soil , the effective hydraulic channel conductivity and the saturated hydraulic conductivity of soil also has significant on runoff simulation. The results can provide a theoretical guidance to reduce the impact of the parameter uncertainty of hydrological model.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LI Ziyan, LIU Dengfeng, HUANG Qiang, BAI Tao, ZHOU Shuai]]></author>
<pubDate><![CDATA[2018-08-30 00:00:00.0]]></pubDate>
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<title><![CDATA[Influencing Factors of Adhesive Slant Shear Strength of Bond between Rubber Concrete and Ordinary Concrete]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1491.shtml</link>
<description><![CDATA[The Experimental study on the adhesive properties of inclined shear of the new rubber concrete with the old common concrete,and study on the effects of particle size, dosage and interfacial agent on adhesive properties of inclined shear. The test results show that the adhesive properties of inclined shear of rubber concrete with 1.0至3.0mm rubber particles is slightly greater than that of rubber concrete with 3.0至6.0mm rubber particles. The adhesive properties of inclined shear of the concrete bond specimen decreases with the increase of the content of rubber particles. Compared with uncoated interfacial agent and cement paste interfacial agent, the new epoxy interfacial agent can improve the adhesive properties of inclined shear of concrete bond specimens. The composite modification has obvious effect on the improvement of the adhesive properties of inclined shear between rubber concrete mixed with 3.0至6.0mm rubber particles and ordinary concrete, while the effect is poor when mixed with 1.0至3.0mm rubber particles.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Feng Lingyun,Huang Fu Zehua,Han Juhong,Yuan Qun,Ren Xiaofu,Wu Huanhuan]]></author>
<pubDate><![CDATA[2018-08-30 00:00:00.0]]></pubDate>
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<title><![CDATA[Numerical Simulation of Whole Process of Concrete Fracture under Hydrostatic Pressure]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1478.shtml</link>
<description><![CDATA[Based on the initial fracture toughness criterion and the Paris displacement formula,the theoretical expressions of external loads and crack opening displacements of concrete wedge-splitting specimens under hydrostatic pressure were deduced. The numerical iterative method was used to simulate the whole fracture process.Researched the effect of water pressure on the whole fracture process of concrete.Under different water pressures,the parameter sensitivity of the peak load and the open displacement of critical fracture were further analyzed.The results show that the full crack propagation curve calculated by this method are in good agreement with the experimental results.Water pressure and initial crack length affect the load-displacement curve.With the increase of water pressure, the peak load and the critical crack mouth opening displacement are all reduced. With the increase of initial crack length, the influence of water pressure on the whole process curve of crack propagation is more obvious. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[QING Longbang, SU Yimeng]]></author>
<pubDate><![CDATA[2018-08-20 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on shaft tubular pump unit based on regular design]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1477.shtml</link>
<description><![CDATA[In order to discuss the regular design method of shaft tubular pump set, more than twenty typical large-scale tubular cross-flow pump devices were selected as statistical analysis objects, and the main control size reasonable value range of inlet and outlet flow channels was obtained through analysis. Combined with practical engineering, based on the regular design method, a large shaft tubular pump device with an impeller diameter of 3200 mm was designed. 3D-Turbulent flow numerical simulation was applied to analyze water flow characteristics and hydraulic loss characteristics, and velocity distribution and inflow angle of shaft passage based on regular design method. It reveals that hydraulic loss is 0.065 m of inlet passage, 0.096 m of outlet passage, and inlet passage exit velocity uniformity and inflow angle is respectively 97.5% and 87.7 ? . A model pump device was designed and made according to the model scale 10.667. The test system was constructed and the energy characteristics of the model pump set were studied. Research indicates, based on the regular design of the shaft tubular pump device, the lift of the ultra-low device is 1.08m, the pump set efficiency is 77.5%, the efficiency of the design point Q=25 m3/s, H=0.62m is 66%, and the efficiency of the pump device is high. The research results have important guiding significance for the hydraulic optimal design of shaft tubular pump device.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[CHEN Jiaqi, ZHU Quanrong, SU Zhimin, ZHOU Zhengfu, CHEN Songshan]]></author>
<pubDate><![CDATA[2018-08-20 00:00:00.0]]></pubDate>
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<title><![CDATA[A hydrological staging method based on Bai and Perron’s multiple structural breaks test]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1476.shtml</link>
<description><![CDATA[ Under the conditions of global warming and violent human activity, and flood disasters occur frequently. This article proposes a hydrological staging method based on Bai and Perron’s(BP) multiple structural breaks test in order to provide the basis for flood disaster prevention and so on. This method is an unit root test of multi-structural breaks which introduces structural mutation components based on the traditional unit root test. Process data first, and use Bai and Perron’s multiple structural breaks test to check out the structural breaks, the start and end of flood season. Finally, the results of this test are used for hydrological staging. BP test and traditional fuzzy statistical method are used to test the runoff series in the middle and lower reaches of the Lancang River. The flood season is June to October, and the non-flood season was November to May of the following year. The results of BP test and fuzzy statistical method are consistent, which proves that using Bai and Perron’s multiple structural breaks test for hydrological staging can meet the needs of hydrological staging. And Bai and Perron’s test is more applicable for variable scale sequence when compared with fuzzy statistical method. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[KE Wei, XIE Ping, SANG Yanfang, WU Ziyi]]></author>
<pubDate><![CDATA[2018-08-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on Vibration Fault Diagnosis of Hydro-power Unit Based on Bayesian Network]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1475.shtml</link>
<description><![CDATA[ The condition monitoring system of hydropower station has accumulated a lot of monitoring data.
However, due to the lack of on-site experts, these data have not been well utilized. How to mine these data and combine expert experience for fault diagnosis is the focus of this paper. In this paper, a vibration fault diagnosis model for hydropower units based on Bayesian network is proposed. Bayesian network structure and some node parameters are obtained based on expert experience. Data signals are discretized by SOM neural network. The probability distribution of other nodes was obtained by learning parameters of EM algorithm. The subsystem models based on Bayesian network are built and integrated into a complete system model. At the end of the article, the correctness and rationality of the model's diagnostic results are verified through the design test.  
]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[LIU Dong, WANG Xin, HUANG Jianying, ZHANG Xiaojing, XIAO Zhihuai]]></author>
<pubDate><![CDATA[2018-08-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on Multi-objective operation and Decision Making of Parallel reservoirs for the Hanjiang-to-Weihe Water Diversion Project in dry year ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1474.shtml</link>
<description><![CDATA[ Aiming at proving the ability of water diversion and power generation of Hanjiang-to-Weihe Water Diversion Project in dry year, a multi-objective optimal model has been constructed by parallel reservoirs. Non-dominated sorting genetic algorithm II (NSGA-II) has been used to solve the model, then the four-dimensional evaluation indexes has been constructed, and the final optimal scheme was effectively obtained by the approach of successive elimination of alternatives based on order and degree of efficiency (SEABODE). The results prove that: among the three dry years, only 1.36 billion cubic metres of water could be transferred in low water year and water shortage will be occurred in 3 months. Meanwhile, average 1.01 billion cubic metres of water could be transferred and water shortage will be occurred in 8~10 months in extraordinary dry year inevitably, while the maximum shortage in one month is 74 million cubic metres. The results quantify the water shortage  and provides a theoretical basis for guiding the efficient utilization of water resources in dry year for Hanjiang-to-Weihe Water Diversion Project.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[JIN Wen-ting, WANG Yi-min, BAI Tao, SHI Jing-tao]]></author>
<pubDate><![CDATA[2018-08-17 00:00:00.0]]></pubDate>
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<title><![CDATA[Design management of international EPC projects based on contractor-designer alliance  ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1473.shtml</link>
<description><![CDATA[The majority of Chinese international EPC contractors are construction companies, because their strengths lie in construction, there is a clear need for these contractors to choose suitable designers as their cooperative alliance to improve the design ability of international EPC project. Based on literature review, a conceptual model of alliance between contractors and designers in international EPC projects was established. Path analysis was adopted to analyze data collected by questionnaires, interviews, and case studies to test the above conceptual model, and revealed two significant paths from contractor-designer alliance to final design ability: alliance → preliminary design ability → final design ability and alliance → final design ability. The results of survey data analysis demonstrate that preliminary design ability is the basis of final design ability, and can critically affect final design ability. The contractor-designer alliance can not only improve its final design ability by enhancing its preliminary design ability, but can also directly promote its final design ability.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Qingzhen, TANG Wenzhe, ZHANG Xuteng, SHEN Wenxin, LEI Zhen, HUANG Yulei]]></author>
<pubDate><![CDATA[2018-08-10 00:00:00.0]]></pubDate>
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<title><![CDATA[Threshold Condition of Neck Cutoff of Qigongling Bend and Its Influence on Chenglingji Water Level in Lower Jingjiang River]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1472.shtml</link>
<description><![CDATA[Neck width of Qigongling bend is much less than average channel width in the confluence of lower Jingjiang River and Eastern Dongting Lake, in combination with the effect of Three Gorges Reservoir that results in scouring riverbanks to speed up the neck narrowing. In case of the occurrence of neck cutoff triggered by overbank flooding or bank collapse, it is essential to investigate the condition of neck cutoff in this bend. Using hydrological data, topographic data, and MIKE21 hydrodynamic model, two-dimensional hydrodynamic model of the upper and lower reaches of Qigongling Bend (Jianli-Luoshan reach) was established. The hydrodynamic simulation and analysis were conducted under different discharge conditions and cutoff channel depth in neck, in order to reveal the hydrodynamic condition of neck cutoff and influence on the Chenglingji water level. Results show that it is highly possible that neck cutoff triggered by overbank flooding and bank collapse may occur under the conditions of high flood discharge and narrower neck, respectively. The water level at Chenglingji station tends to increase by at least 0.3 m after neck cutoff due to the top-off effect of the Eastern Dongting Lake confluence. Although the top-off effect has different amplitude of water level, the discharge difference of new cutoff channel and previous main channel is always less than 1% of incoming discharge.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[YUAN Shuai, LI Zhi-wei, ZHU Ling-ling]]></author>
<pubDate><![CDATA[2018-08-08 00:00:00.0]]></pubDate>
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<title><![CDATA[Experimental Study on Seepage Deformation of Unsaturated Gravel Clayey Soil]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1471.shtml</link>
<description><![CDATA[Key words: Gravel soils; piping; fines content; pre-saturated state; loading mode of hydraulic gradient

 
0  引言
为了协调解决变形和抗渗问题，国内外高心墙堆石坝常采用砾石土作为Experiments of seepage deformation of unsaturated gravel clayey soil are carried on in this paper. The influence of the saturated state and the loading mode of hydraulic gradient on the ability against seepage failure of wide-graded gravel clayey soil is studied. The saturation state has great influence on ability against seepage failure. The pre-saturated soil sample can bear large hydraulic gradient without piping failure. When the soil sample is not pre-saturated, piping failure occurs at a certain hydraulic gradient. When relatively large hydraulic gradient is applied at one single stage, unsaturated gravel soil samples all fail. The time at which the fine particles begin to be brought out and the time to piping failure decreases with the increasing of hydraulic gradient. The decreasing of fines content will also lead to a decline in the resistance of the sample to piping failure. For gravel soils with same dry density and water content, the failure hydraulic gradient decreases with the decreasing of fines content. The anti-piping ability of gravel soil with the protection]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[TIE Mengya, ZHANG Yinqi, DENG Gang*, WEN Yanfeng, ZHANG Yanyi ]]></author>
<pubDate><![CDATA[2018-08-07 00:00:00.0]]></pubDate>
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<title><![CDATA[Development of a Three-dimensional Two-phase Mixture Model Based on SCHISM]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1470.shtml</link>
<description><![CDATA[In classical fluvial models, flows carrying suspended sediment are usually described by the Reynolds equations directly borrowed from the fluid dynamics for single-phase flows with an advection-diffusion equation supplemented for considering the transport of suspended load. Since classical models cannot consider the complicated mechanisms arise from interphase interaction and particle collisions, classical fluvial models cannot give a good prediction when the particle size and concentration increase. A two-phase mixture model was adopted to investigate sediment-laden flows. This model considers solid-liquid flows as an integrity with interphase interactions and particle collisions considered. This model has a very similar form to the classical fluvial model, thus is easy to be embedded in existing codes and applied practically. This paper summarizes the basic equations of the two-phase mixture model. The equations of the two-phase mixture model were then rewritten in the form of the governing equations used in a developed 3D hydrodynamic model SCHISM. Finally, fully developed steady and uniform open channel flows, trench observations and an actual flood occurring in the reach from the Huayuankou to Aishan station in the Yellow River are investigated by this model.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HUANG Hai, ZHANG Hongwu, ZHANG Lei，ZHONG Deyu]]></author>
<pubDate><![CDATA[2018-07-27 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on optimal Design of Spillway of Qianping Reservoir based on hydraulic Model Test]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1469.shtml</link>
<description><![CDATA[The hydraulic model test of Qianping reservoir hub project shows that the overall design arrangement of diversion tunnel, spillway and flood discharge tunnel of Qianping reservoir is reasonable, the level of upstream reservoir area is smooth, and the water surface of the reservoir area is relatively calm. There is no large bad flow pattern in the open discharge of the buildings, and the discharge of the buildings meets the design requirements. However, because the spillway is located at the entrance of the hillside on the left bank of the main dam, it is affected by the transverse flow of water in the reservoir area. In the front of the guide wall on the left and right bank of the inlet canal there is a transverse deflection which affects the water flow through the sluice.In order to improve the water flow pattern, six types of guide wall on the right side of spillway inlet are studied experimentally. At the same time, under the condition of selecting the recommended scheme, the optimum shape of the left guide wall is studied under three working conditions. It has the effect of design optimization, and also provides reference for other projects.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Zhu Cuimin, Huangfu Zehua,Huangfu Mingxia,Zhao Yuliang,Peng Guanghua]]></author>
<pubDate><![CDATA[2018-07-23 00:00:00.0]]></pubDate>
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<title><![CDATA[Research on the fuzzy risk of short-term operation of hydropower station considering the runoff forecasting error]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1468.shtml</link>
<description><![CDATA[The forecasted runoff is used for formulating the plan in the short-term power generation operation of hydropower station. Due to the accuracy limitation of runoff forecasting, there is error between the forecasted inflow process and actual inflow process, which will bring the problems of water abandoning or output shortage when the hydropower station operation is close to the borderline water levels. In view of this, to quantitatively analyze the fuzzy characteristics of runoff forecasting error and its influence on short-term power generation operation of hydropower station, this paper proposed an optimization method of fuzzy membership function for runoff forecasting error based on the optimal closeness criterion, and by introducing the credibility theory, established a fuzzy risk analysis model for the short-term power generation operation of hydropower station, especially when the operating water level is close to the two typical borderlines (normal and dead water levels), and this model effectively realized the coupling and transformation between the fuzziness of forecasting error and the risk of hydropower station operation. In the case study of Jinxi hydropower station, this model presented the high risk areas and suggested operation areas for this hydropower station in the two typical borderline situations, which can provide a strong reference for the actual short-term power generation operation.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[JIANG Zhiqiang; WU Wenjie; QIN Hui; JI Changming, ZHOU Jianzhong]]></author>
<pubDate><![CDATA[2018-07-23 00:00:00.0]]></pubDate>
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<title><![CDATA[Experimental study on formation and morphologic change of the Lake Delta due to deposition]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1467.shtml</link>
<description><![CDATA[Formation and evolution of the lake shallow water delta are the important parts of river alluvial processes, and the research on waterway alluvial process in delta has become the key problem in the study of river dynamics. Tank experiments based on the natural model method were carried out to simulate the formation and evolution of the lake delta. By changing the upstream sediment supply and downstream water level, the experiments explored the influence of different boundary conditions on the delta plane shape, longitudinal, vertical and horizontal stretching. The deltas first stretch forward like the tongue, and then change as the development of lobes. The ratio of length to width increase rapidly first and then comes to a relatively stable stage. The more the amount of sediment from the upstream is, the smaller the ratio of length to width of the delta becomes. And the higher the downstream water level is, the more obvious the size of the delta can be suppressed. Both longitudinal and lateral broadening of the delta present the rapid growth in the beginning, and then enter a relatively stable period, during which the "step type" growth appears. The more sediment concentration is, the faster the speed of horizontal and vertical propulsion grows, resulting in an earlier abrupt growth. The higher the water level is, the sooner the delta enters a stationary phase with smaller size, and the longer the mutation period is, the smaller the growth value appears. Sediment often silted in the downstream of the delta. However the more coming sediment will cause the sediment accumulate in an upper section. The upstream channel depth decreases, the slope of the cross section in the middle and lower reaches increases and overall longitudinal slope of the delta increases. ]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[XU Haijue, HU Xiao, BAI Yuchuan, YANG Haojun, ZOU Dasheng, BAI Yang]]></author>
<pubDate><![CDATA[2018-07-23 00:00:00.0]]></pubDate>
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<title><![CDATA[Explicit solution analysis of underground pipeline mechanical response under tunnel construction condition]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1453.shtml</link>
<description><![CDATA[ In order to study the influence of underground pipeline under tunnel construction, the modified formula was proposed to consider the influence range of tunnel construction on underground pipelines based on the theory of Winkler elastic foundation beam and related research results. The explicit solution calculating the deformation of the underground pipeline in a single line tunnel and a new method that is suitable for solving the mechanical response of underground pipelines such as slop, bending moment and shear force are given out in this paper. On the basis of this, the reliability of the method is validated by MATLAB software. Finally, the calculation method of the underground pipeline mechanical response during the construction of the side-by-side twin tunnels was proposed with the superposition principle. The study shows that there is significant difference in the mechanical response of underground pipelines under side-by-side twin tunnels construction and that of single line tunnel, and the distance between side-by-side twin tunnels has a significant influence on the mechanical response of underground pipelines: with the distance between side-by-side twin tunnels varying, the trend of the deformation and slope distribution of underground pipelines is basically the same, but the maximum deformation and slope are always larger than single line tunnel; meanwhile, there is a certain range, and the maximum bending moment and shear force are larger than the single line tunnel when the distance between the tunnels is outside this range. Otherwise, the maximum bending moment and shear force will appear smaller than the single line tunnel. This paper provides an effective calculation method for calculating the mechanical response of underground pipeline to ground movement caused by single and twin tunnels construction, which can provide a theoretical reference for the safety evaluation of operating status of urban underground pipelines.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Wenjun，ZHU Zhankui，LI Yao]]></author>
<pubDate><![CDATA[2018-07-15 00:00:00.0]]></pubDate>
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<title><![CDATA[Oxygenation performance evaluation of an improved MABR ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1450.shtml</link>
<description><![CDATA[The key to managing the city's black odorous water is to increase the oxygen content of the water body. The low-pressure and bubble-free characteristics of the membrane aeration biofilm reactor (MABR) often lead to uneven distribution of dissolved oxygen (DO) in the treated water, thereby reducing the overall oxygenation performance of the MABR system and affecting the treatment effect. For this problem, the MABR system is modified to provide special hollow fiber membrane filaments in this study. The improved MABR system can form bubble plumes, whose stirring characteristics can keep the MABR system’s oxygen transfer efficiency high and improve its oxygen uniformity simultaneously, and then improve the black stink water treatment effect. The simulation experiment was conducted to analyze the oxygenation effect and uniformity of the modified MABR system in the artificial black and odor water. The results showed that the oxygenation effect of the improved MABR system increased with the increase of aeration pressure. Compared with the average DO saturation rate within 24 h of the non-aerated (0 kPa) test, the average growth rate of river DO saturation rate was -2.8%, 17.7% and 29.4%, and 13.6%, 6.6%, and 32.1%, respectively in the horizontal and depth tests at 10, 20, and 30 kPa. At the same time, the distribution of river DO saturation rate in the horizontal and depth tests was more uniform with the increase of aeration pressure, compared with the 0 kPa test (the mean variance of the DO saturation ratios in the horizontal and water depth tests were 1.7 and 13.5, respectively), the mean deviations of the DO saturation rate of the river water in the horizontal and water depth tests at 10 20 and 30 kPa were 0.3, 3.9 and 0.4, and 9.8, 18.4 and 3.4, respectively. The improved MABR system can achieve a good oxygenation effect and uniformity to the water body and provide technical support for solving the problem of black and odor water body in urban rivers in China.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[SUN Qiu-hui, DENG Heng,CAO Cuicui, MA Chao, GUO Qi-zhong, CHEN Liang]]></author>
<pubDate><![CDATA[2018-07-05 00:00:00.0]]></pubDate>
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<title><![CDATA[Improved model of maximum energy storage increment based on progressive approximation]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1449.shtml</link>
<description><![CDATA[The traditional criterion of maximum energy storage increment does not take into account the influence of hydropower stations’ power generation efficiency and uses the average value of a period to approximately calculate the energy storage increment, which cannot reflect the hydropower stations’ dispatching objectives. In view of the above problem, this paper first introduces the concept of energy efficiency coefficient to reflect a hydropower station's capacity to utilize hydropower resources, and the traditional criterion of maximum energy storage increment is improved. Secondly, progressive approximation algorithm is adopted to accurately calculate the energy efficiency coefficient of each hydropower station in the improved criterion of maximum energy storage increment, and an improved model of maximum energy storage increment based on progressive approximation is established. Finally, a case study of Pankou-Xiaoxuan cascade reservoirs in the Du River basin is carried out. The results show that the model in this paper is scientific and reasonable. Through the model’s calculation the energy storage and the power generation benefits of cascade reservoirs can be effectively promoted. Compared with the existing models, this model has a better optimization effect, thus can provide more effective guidance for the production practice of "electric to water" mode.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[JI Changming, YU Hongjie, YAN Xiaoran, WEI Xiaowen, WANG Liping]]></author>
<pubDate><![CDATA[2018-06-29 00:00:00.0]]></pubDate>
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<title><![CDATA[Runoff and sediment load variations in the Middle and Lower Reaches of the Beijiang River and the impacts of cascade reservoirs ]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1448.shtml</link>
<description><![CDATA[ Quantitative research on the sediment trapping effect was key in revealing the influence of cascade reservoirs on sediment transport. Based on the analysis of runoff and sediment variations in the middle and lower reaches of the Beijiang River recorded at the hydrologic stations on the main river and tributaries in the past 60 years, the sediment trapping efficiency of the reservoirs had been estimated. A modified trapping efficiency formula was proposed based on the trapping efficiency curves obtained by G. M. Brune, and was used to investigate the influence of cascade reservoirs on sediment transport. The results showed that: (1) The sediment discharge at the Shijiao Station during 2000-2005 was 39.17% less than the value in 1956-1999, while the annual runoff declined by only 6.16%. The total sediment trapped by the reservoirs was about 1.4259 million tons per year, which accounts for about 52.34% of the sediment reduction at the Shijiao Station. The contribution of project measures of water and soil conservation to the reduction in total sediment load was 18.83%, and the runoff amount conservation dropped by 5.07%. (2) The cascade reservoirs’ sediment trapping efficiency was about 12.81%, as computed by the modified trapping efficiency formula, which was in agreement with the measured value. (3) Since 2006, the rates of sedimentation and sand mining were nearly balanced in the cascade reservoir area, and the reservoirs’ sediment trapping efficiency will be maintained at this level for a long time into the future.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[HUANG Dong, LI Haibin, LIAN Weihang, LIU Huamei, XU Linchun]]></author>
<pubDate><![CDATA[2018-06-29 00:00:00.0]]></pubDate>
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<title><![CDATA[Study on deriving the staged dispatching rules of hydropower station]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1447.shtml</link>
<description><![CDATA[Based on Grey relational analysis (GRA) and Bayesian model averaging (BMA) method, this paper proposes a method for the regulation of hydropower production dispatch in hydropower station. According to the results of deterministic optimal dispatch model, the decision variables and impact factor sets are determined firstly based on GRA. Then, Multivariate Linear Regression model, Support Vector Machine model and Back Propagation System model are used to obtain the staged hydropower production dispatch function. At last, BMA is applied to derive the final monthly power dispatch function. Taking the Xinanjiang hydropower station as a case, the research shows that the method is of better accuracy in simulating，and can inherit the deterministic optimal dispatch efficiency in hydropower production.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[Guo Yuxue, Fang Guohua*, Wen Xin, Huang Xianfeng ]]></author>
<pubDate><![CDATA[2018-06-29 00:00:00.0]]></pubDate>
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<title><![CDATA[Prototype test on anti-collision device of Xiangjiaba ship lift chamber impacted by ship]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1446.shtml</link>
<description><![CDATA[ Anti-collision device of chamber is important to keep the running safety of large ship lift and becomes the focus in the navigation acceptance. In order to investigate the validity and reliability of the chamber anti-collision device of Xiangjiaba ship lift and reveal the working mechanics of the anti-collision system of the “braking cylinder with wire rope” type, prototype impact test on anti-collision device is conducted. The results show the running ship with five different speeds is stopped by the anti-collision device and the design is reasonable and the function is reliable. Under the condition of over design ship speed 0.6m/s and over design kinetic energy, the buffer cylinder reaches the first step overflow status and the maximum force of the wire rope is 51 t, the maximum stress of the predetermined breaking point is 254.5MPa and has not reached the lower yield strength. The maximum buffer distance is 2.43m and still in the permit scope of design. It shows linear relationship between the force of anti-collision and the ship speed. The impact kinetic energy is mainly transferred by the buffer cylinder power and the energy dissipated by the buffer cylinder power is over 75% of the impact kinetic energy.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[WANG Xin, HU Ya-an]]></author>
<pubDate><![CDATA[2018-06-26 00:00:00.0]]></pubDate>
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<title><![CDATA[Variations in planform and cross-sectional geometries of the Qingshuigou channel in the Yellow River Estuary (1976-2016)]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1424.shtml</link>
<description><![CDATA[(2 Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003 , China)
Abstract: Remarkable channel adjustments have occurred in the Yellow River Estuary since the artificial avulsion from the Diaokouhe course to Qingshuigou course in 1996. The processes of the channel evolution can be divided into four phases, following the sequences of “rapid aggradation—channel scouring—channel shrinkage—severe degradation”. The variations in channel geometry indicated that: (i) during the first period from 1976 to 1980, the study reach underwent drastic aggradation, with the increase rate of the channel length being from 75.1km to 93.2 km; (ii) numerous branches near the river mouth gradually coalesced into a single channel directed to the southeast in 1980-1984, and channel incision was dominant during this period; (iii) After 1984, the bankfull area decreased by 61% due to the severe shrinkage caused by the operation of Longyangxia reservoir. The thalweg migrated frequently with the migration intensity and distance of 0.17 and 102 m, respectively; and (iv) the bankfull depth increased by 41% during the period from 1999 to 2016, and the migration width and intensity decreased to 37 m and 0.09, respectively. In addition, empirical relationships between the reach-scale bankfull dimensions, the thalweg-migration intensity and the previous 4-year average fluvial erosion intensity were developed, with high correlation degrees between them being obtained.
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<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[ZHANG Shi-yuan，XIA Jun-qiang，WAN Zhan-wei, LI Jie]]></author>
<pubDate><![CDATA[2018-05-25 00:00:00.0]]></pubDate>
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<title><![CDATA[Investigation on internal wave due to hydro-peaking in a deep run-of-the-river reservoir]]></title>
<link>http://manu71.magtech.com.cn/Jwk3_slfdxb/EN/abstract/abstract1420.shtml</link>
<description><![CDATA[The Xiluodu Reservoir is a quintessential deep run-of-the-river reservoir. Under stratification, hydro-peaking would induce internal wave at metalimnion. In this study, long-term water temperature in the reservoir was measured by a thermistor chain and a two-dimensional longitudinal-vertical numeric model was established to simulate the internal wave. Based on the observation and simulation, the phenomenon, formation and propagation of the internal wave were studied. The results shows that, the epilimnetic withdraw and hydro-peaking induced the 24-hour-period internal wave. The amplitude of this wave decays while propagating upstream along the metalimnion and the wave speeds agree well with the solution of Kelvin- Helmholtz wave theory. This hydro-peaking internal wave has no significant influence on the deepening of the hypolimnion. Currently, there are only a few studies about internal wave in deep run-of-the-river reservoir. This study would enhance the understanding about internal wave in reservoir and provide analysis tool and theoretical foundation for engineering applications related to internal wave.]]></description>
<category><![CDATA[Forthcoming Articles]]></category>
<author><![CDATA[XIE Qike, LIU Zhaowei, CHEN Yongcan, CHEN Xiao]]></author>
<pubDate><![CDATA[2018-05-24 00:00:00.0]]></pubDate>
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