针对土石围堰过水时淘刷围堰堰脚和下游河床的问题,基于面流冲刷理论的计算方法,对围堰下游的冲刷及其相关水力指标进行了仿真计算;通过模型试验得到过堰水流冲刷产生的坑深、坑距以及水位、流速等水力参数,比较分析表明计算成果与试验成果吻合较好.同时发现当导流河床的特性和围堰结构型式使过堰水流产生收缩与不均匀分布,仿真计算相关水力指标值会略小于试验值. Aiming at the problem of scouring cofferdam cofferdam and downstream river bed when soil cofferdam crosses over water, the scour of downstream cofferdam and its related hydraulic indexes are simulated based on the calculation of surface scour theory. The cofferdam The pit depth, the pit distance, the hydraulic parameters such as the water level and the velocity of flow produced by water scouring are comparatively analyzed, and the results show that the calculation results are in good agreement with the experimental ones.It is also found that when the characteristics of the diversion channel and the cofferdam structure structure cause the shrinkage of the weir flow, Uniform distribution, simulation calculation of hydraulic indicators will be slightly less than the experimental value.