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The Energy Dissipation Effect of Combined Flared Piers and Bucket Basin of Yantan Project

Wu Shengguang(Guangxi Yantan Hydropower Construction Corporation)  
The combined dissipator of flared piers and bucket basin was initated in China.The difficulties of dissipation arising from big unit flow over high spillway dams and low froude number is resolved.The effect is very remarkable in Yantan project.Higher flow velocity in the basin is reduced more than one half at the tail of basin and the outflow is rather smooth.The height of wave in the river channel is evidently decreased and the erosion of bank is weakened.The range of misting is reduced.Besides around the end of guide wall between the power house and dam no erosion is observed in the river bed.
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