Energy Dissipation Method of Overflow Surface Hole of Dongzhuang Water Conservancy Project
The Dongzhuang Water Conservancy Project is located in a narrow river channel,and the sediment ejection and flood releasing orifices are compactly arranged in the dam body,so the exit of the flood releasing structure not only requires sufficient energy dissipation,but also should reduce the adverse impact of flood discharge atomization on the bank slope and buildings on both sides as much as possible.For the purpose of optimizing the energy dissipation mode and body shape of the outlet of the overflow surface hole,a lot of research work have been conducted by the design institute together with Tianjin University and Nanjing Institute of Hydraulic Sciences,based on hydraulic model tests,including wide-flange pier+drop flow,drop flow+deflecting flow,wide-flange pier+drop flow+deflecting flow,narrow slit+base slab hollowing+drop flow.In order to make the nappe from the surface hole diffuse for energy dissipation in the air and disperse into water,so as to reduce the impact pressure and pulsation pressure peak of the bottom plate of plunge pool,and minimize the impact of atomization,the joint energy dissipation mode of narrow slit+base slab hollowing+falling flow is finally adopted for the overflow surface hole.
overflow surface holeoutlet energy dissipationwide-flange piernarrow slitbase slab hollowing
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