为了保证大岗山水电站截流工程成功实施 , 进行了截流模型试验研究。通过对大岗山水电站工程截流方案的试验研究，获得了截流过程龙口的水流特性，确定了不同龙口宽度时抛投材料的粒径和合理的抛投强度，推荐采用单戗双向截流的较优方案，为工程截流的实施提供了科学依据。

By eight river closure scheme tests about Dagang Mountain Hydropower Station Project, the flow characteristics of closure-gap during the closure was analyzed, the equivalent diameter of dumped ripraps and reasonable intensity of dumping in the different closure-gap widths were decided. The closure result shows that the single-dike bidirection end dumping closure is feasible, successful, which provides a scientific basis for implementation of closure work.