立堵截流龙口水力特性与截流难度的试验研究

Research on Hydraulic Parameter and Dumping Intensity of River Closure

利用某水电站截流模型,研究了立堵截流过程中龙口流速、落差、单宽功率的变化规律,同时分析了龙口水力要素与不同截流方案下抛投强度的依存关系。试验研究表明,截流过程中最大单宽功率出现在龙口宽度比为0.32时,这一时期抛投强度和大规模抛投材料使用量最大即截流难度最大,是截流关键期。另外,通过对比,不同截流方案下各龙口水力要素最大值(龙口区水流最大落差、最大流速与单宽功率)与抛投强度、大规模抛投材料均有一定关联,同时也受到截流流量、下游控制水位和抛投材料的重要影响。

By way of the river closure hydraulic model of a hydroelectric station, the change regulations of velocity, static head and the single wide power of gap is studied and the dependence relationship between hydraulic parameter and dumping intensity of differ- ent closure plans is analyzed. The experimental research shows that the biggest single wide power appears when the ratio of gap width is 0. 32. It is the crucial period of the difficulty of closure which dumping intensity and large-scale dumping material reaches the maximum. Besides, there is some relationship between hydraulic parameters （maximal static head , velocity and the single wide pow er） and dumping intensity, large-scale dumping material. The hydraulic parameters are also influenced by closure discharge, control water level of downstream and dumping materials.