中文摘要：

计算双戗堤立堵截流龙口水力要素时，提出用非恒定流计算方法求解戗堤间恒定流动时的水面线，分析龙口流速变化规律，研究上戗堤、下戗堤进占时截流落差分配之间的关系，降低上戗堤合龙难度，提出相应的双戗堤截流优越性判断方法．通过物理模型试验分析截流过程中戗堤间水位变化规律，分析双戗堤截流机理，验证双戗堤立堵截流水力控制条件及其双戗堤优越性判断方法的正确性．

英文摘要：

A steady flow is solved as an unsteady flow is when hydraulic parameters of river closure gap are calculated in order to offer method of calculating closure. On the basis of analyzing the regularity of river closure gap flow velocity, the optimal distance between upriver and downriver embankments and fall head of water distribution is advanced. A judging method of river closure with double embankments is put forward. Variational regularity of water level between double embankments is analyzed through physical model test, which proves that the formula that controls river closure using double embankments and the method judging superiority of two embankments is reasonable.