Abstract: The Changheba hydropower station is typical of high head and large capacity of multi-tunnel
combined discharge with flip-bucket energy dissipaters that require a great capacity of the downstream river
channel in energy dissipation and anti-scour. Large-scale hydraulic model tests have been conducted to solve
the problems of insufficient energy dissipation and poor condition of nappes plunging into river at the initial
stage. For slit-bucket and constant-width flip bucket, we compared their effects of energy dissipation and
anti-scour on the second spillway in the conditions of individual operation and combined operation, and
verified the advantages of combined slit-bucket and flip bucket for multi-tunnel combined operation. The
results are useful for design of similar energy dissipation and anti-scour structures.