某电站明渠截流优化方案试验对比研究  

Experimental and comparative study on optimal scheme of open-channel closure for construction of a hydropower station

作　　者：李盼[1] 雷运华[2] 张建民[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点试验,四川成都610065 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《水利水电技术》2016年第5期38-42,共5页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金资助项目(51279118)

摘　　要：针对流速高、落差大、单宽功率高的明渠截流工程,采用物理模型方法进行试验,获得了截流水力学参数与上游梯级电站调控流量及分流建筑物提前分流方式的相关变化规律,比较了不同戗堤方式对截流水力学指标的影响。通过对比试验与分析,论证了合理的龙口流量调控措施——导沙坎分流孔,其设置可有效降低截流龙口抛投量、尺寸及其流失率。研究表明,对于高落差,大流速并存的明渠截流而言,选取合理的截流流量和分流建筑物有利于降低截流难度,增加工程经济性和安全性。研究成果可供类似工程参考。For the open-channel closure project with high flow velocity,large head and high unit-width power,experiment is made with the method of physical model,and then the hydraulic parameters of the closure as well as the regulated flow rate of the upstream cascade hydropower station and the relevant variation of the advanced diversion mode of the diversion structure are obtained,while the impacts from the modes of various closure dykes on the closure hydrauolic indexes are compared. Through the experiment and comparison,a reasonable measure for regulating the gap flow rate——the diversion orifice of sand-guide sill is verified,of which the arrangement can effectvely decrease the quantity,size and loss rate of the dunping materials. The study shows that for the open-channel closure with high head and large flow velocity,choosing reasonable closure flow rate and diversion structure is favorable to lower the closure difficulty and enhance the economics and safety of the project. This study result can provide references for the similar project concerned.

关 键 词：截流 高流速 大落差 龙口 流量调控 水力学参数 模型试验 

分 类 号：TV13[水利工程—水力学及河流动力学]