In common bucket dissipation design, deflecting distance and depth of scour hole are usually considered important, but the influence of upstream boundary condition to flow phenomenon of inflow is ignored. Combining with hydraulic model test of Cha' yuan Reservoir, analyzing the causes of curved turbulent belt formed on the upstream surface of the reservoir when bucket flood discharging with big flow, the writer emphatically researches the scheme eliminating the curved turbulent flow in order to ensure the project operation safety.
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