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HydraulicCharacteristics and Energy Dissipation ofstepped Spillway

Pan Ruiwen ;Xu Yiming ;Yang Zhilin(School of Electric Power Engineering,YPU,Kunming,China,65005 1)  
The hydraulic characteristics of stepped dissipation on the spillway face with ahigh sill broad一crested weir are sys tematicaIIy studied by experiment. From comparisonwith the conventional spillway,it is seen that skimming flow formed on the steppedspillway face makes a full entrainment of air into the discharge,and the horizontal axisvortices with much air are developed on the stepped face。The depth and velocitv of aer。ated flow are almost unchanged along the flow course,Agreat amount of flOw energycan be dissipated by the stepped spillway.Hence,the hydraulic conditions in thedownstream can be greatly improved.The periment resuIts show that the steps located onspillway face are an effective dissipator and cavitation of the spillway can be preventedto some exent.The effciency of this energy dissipator depends on weir height,unitdischarge, step height and step number,as well as spillway face slope and the skimmingflow length along the stepped spillway face。
【Fund】: 云南省应用基础研究基金
【CateGory Index】: TV652.1
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