中文摘要：

牙根二级水电站具有高水头、大流量、窄河谷的特点,结合其底流消能进行了模型试验研究。通过反弧末端加设跌坎,降低了消力池的临底流速,对不同的跌坎高度进行比较,总结了跌坎池深比对淹没水跃的影响。通过表孔加设Y形宽尾墩,进一步降低脉动压力和临底流速,增强了消能效果,为工程设计提供了有力支持。

英文摘要：

Yagen Ⅱ Hydropower Station has the features of high water head, large flow rate and narrow valley, and then a model experimental study is made in combination with its underflow energy dissipation. Through adding drop-sill at the end of the ogee section, various heights of the drop-sill are compared, while the effect of the sill-pool depth ratio on the submerged hydraulic jump is summarized as well. With arranging additional Y-type flaring pier for the crest outlet, the fluctuating pressure and the underflow velocity are further lowered, thus the dissipation effect is enhanced, and a powerful support is provided for the engineering design concerned.