针对碧湖水库溢流坝水翅及出坎水流对冲右岸山体现象，结合工程实际，通过试验对尾墩及挑坎体型进行优化，对比分析了在闸墩后设置尾墩及溢流坝边墙偏转不同角度的优化效果。结果表明，通过在闸墩后设置合理尾墩，可基本消除闸室出口水翅现象；右侧边墙逆时针偏转5°（起始为反弧段）的优化方案使溢洪道出口水舌合理归槽，避免了水流对冲右岸山体的现象，同时满足了下游消能要求。

Considering the phenomenon that the fins of the Bihu Reservoir overflow dam and the outflow of the river rush against the right bank mountain and combining the actual situation of the project, the tail pier and the cantilever shape are optimized through experiments, and the optimization effect of setting tail pier behind gate pier and different deflection angles of side wall of overflow dam are compared and analyzed. The results show that by setting a reasonable tail pier behind the gate pier, the phenomenon of hydrofins at the exit of the gate chamber can be basically eliminated; the optimization scheme of the right side wall deflected counterclockwise by 5°(starting at the inverse arc segment) makes water tongue of spillway outlet return tank reasonably, and avoids the phenomenon that the water flows against the right bank mountain and meets the downstream energy dissipation requirements.