Erosion test on riverbed downstream spillway dam of Chaiping Hydropower Station

The dam of Chaiping Hydropower Station is located close to the riverbed curve and has relatively poor geological conditions.The energy dissipation mode for the dam is surface flow energy dissipation,which complicates the discharge flow state of the hydropower station.The downstream riverbed suffers from violent erosion.Therefore,it is necessary to carry out overall hydraulic model test of the hydropower station to prove that the hydropower station design can meet the engineering operation requirements.This study found that the main stream of the discharge flow from the spillway dam is biased to the right bank,and has seriously eroded the riverbed on the right bank downstream the hydropower station.This affects the stability of the dam and the safe operation of the project.It is necessary to optimize the shape of the hydropower station.In this study,we increased the angle of the right guide wall of the hydropower station,extended the left pier of the left side of the spillway dam,and removed the left guide wall of the overflow dam,so as to force the main stream of the discharge flow to the middle of the channel.The optimization scheme can abate the erosion of the downstream riverbed,reduce the impact of riverbed erosion on the overall stability of the dam,meet the operational requirements of the hydropower project,and provide design reference for similar projects.

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