Flood Discharging and Energy Dissipation Hydraulic Model Test and Study of the Arch Dam for the Shimenkan Hydropower Project

In order to gain a clear idea of the capability of flood discharging and energy dissipation of the arch dam of the Shimenkan hydropower project,a hydraulic model test of arch dam flood discharging capability was made to simulate flood discharging capability,outlet flow velocity,pressure distribution,energy dissipation and erosion under individual operation of 3 crest outlets and 2 intermediate outlets or under joint operation of a crest outlet and an intermediate outlet,so that the shapes and configurations of the crest outlets and the intermediate outlets in the original design could be verified and finalized.The change of pressure applied on the plunge pool bottom plate during flood discharging was simulated and necessary measures were taken to protect the bottom plat from damage according to the simulation result.A simple analysis was made of atomization caused by flood discharging,and comments on improvement were put forward.