水库防护区泵站设计排水量实例分析

Analysis on Designing Water Discharge of Pump Stations in Protected Reservoir Area

大中型水库一般都修建在山区,库区农田(包括居民点等)防护工程多建在水库淹没深度不大,但处在库区集水区的最低洼处。山区地形坡度大,降雨汇流历时短,区间调蓄能力差,并且防护区多有河流通过。因而,库区防护工程排水泵站与平原圩区除涝泵站在排水设计流量计算上有着根本的区别。通过长江三峡工程库区巴东县平阳坝防护工程设计的实践,探索出用来水过程线推求库区防护工程排水泵站设计流量的方法,该法既省力,又准确。

A large-medium scale reservoir is generally built in the mountain area. The protective projects of farmlands （including residential places, and so on） in the reservoir region are mainly built in the lowest place of reservoir watershed where the floodwater depth is not great. The top- ographic slope is not large. The time of flow concentration of raining is short. The interval regu- lation and storage capacity is poor. And there are many rivers flowing through the protected area. Therefore, there is an essential difference in calculating drainage design between the pump station of protective projects and the waterlog control pump station in plain region. Through the desig- ning of protective projects of Pingyang Dam in Badong county in the Three Gorges reservoir re- gion, it＇s explored the way to design the runoff of drainage dump station of protective projects in the reservoir region by using the original water level. The way is both accurate and labor-saving.