青草沙水库位于长江南北港分流口下游,河势、地形及水动力条件非常复杂,一次性深滩圈围面积大,龙口位于水库下游深槽段,技术难度、组织难度都非常高。本文通过对水库新建大堤进展、阶段性施工顺序、设置二个龙口合龙的必备条件进行分析,保证龙口顺利合龙。 Qingcaosha Reservoir is located at the lower reaches of the north-south port of the Yangtze River. The river conditions, topography and hydrodynamic conditions are very complicated. The one-time beach area has a large enclosed area and the Longkou reservoir is located in the deep channel section downstream of the reservoir. The technical difficulty and the organization difficulty are very high. In this paper, through the analysis of the progress of the newly constructed dike in the reservoir and the stage construction sequence, the necessary conditions for setting up two longkou collisions are analyzed to ensure the smooth closure of Longkou.