面流消能水力设计难点研究

Study on Difficulties of Hydraulic Design for Surface Flow Energy Dissipation

近年来面流消能水力设计在中小型水利水电工程中被广泛采用，设计中存在的一些难点问题也亟待解决。以石桥水电站溢流坝水力设计为例，对设计中选取下游河床高程和坎台高度等难点进行了研究与总结，得出正确选取下游河床高程需要满足：选取坎下主河床最低点；与下游主河道底坡降相协调；与坎下多数点稳定河床标高相一致的要求，及坎台高度灵活选取的条件，解决了这些困扰设计者的难点问题。

Surface flow energy dissipation hydraulic design is widely used in medium and small hydropower engineering, but there are some main difficulties need to be solved urgently. In this paper, it takes the hydraulic design of Shiqiao hydropower station overflow dam for an example; it researches and summarizes the difficulty in design of downstream river bed elevation and selected Kan height. The correct selection of the requirements of downstream river bed highlight must follow three points： Firstly, it should be the lowest point of the main river bed. Secondly, it should coordinate with the main channel of the lower reaches of the bottom slope. Finally, it should coordinate with the most stable river bed elevation. This research solves the difficult problems for designer.