微弯分汊河段枢纽增建鱼道水流条件数值模型试验

大源渡航电枢纽拟增建鱼道，受枢纽总平面布置条件限制，鱼道进口如果布置在电站尾水，则施工难度和投资均较大，存在严重安全隐患。为既确保安全、节省投资，又满足过鱼要求，采用SMS-RMA2模型建立了平面二维水动力数学模型，模拟得出枢纽坝轴线下游一定范围内多种不同工况下的流场图，为在坝址所处微弯分汊河段找到合适的鱼道进口位置提供了可靠的参考依据。为提高过鱼效果，建议在鱼道进口上游侧设置导鱼电栅等拦鱼系统和喷淋水声、灯光等诱鱼系统，帮助鱼类及早发现鱼道入口。

Numerical model test on flow condition of additional fishway in slightly curved braided reach

The Dayuandu navigation power junction is designed to build up the fish path,which is limited by the general layout conditions of the hub.The entrance of the fish way is arranged in the tail water of the power station,the construction is difficult and the investment is big,and there is a serious risk of safety.To ensure the safety,save the investment and meet the requirements of the fish path,a two-dimensional hydrodynamic numerical model is established using SMS-RMA2 model to simulate and get the flow field map in a certain range under different operating conditions in the downstream of the axis of the hub dam and to provide a reliable reference for the determination of the proper fish path entrance in slightly curved braided reach where the dam is built.In order to improve the effect of the fish path,it is suggested to set up the electric fish screen and the sound & light of sprinkler water on the upper side of the inlet of the fish path,so as to help fish find the entrance of the fish path as early as possible.