本文根据杜家台闸历年运用和超标准分洪情况,探讨了汉江在出现特大洪水需要杜家台闸超标准分洪时,由于闸址河段水面比降、流速、回流范围的剧增,弯道环流对凹岸的淘刷以及鱼咀泡旋水流的加剧和进闸流量、挟沙量的增大,所引起的汉江河道防冲护岸及闸身稳定和洪道冲淤等一系列工程安全的问题. According to the years of use and excessive flood diversion of Dujiatan floodgate, this paper discusses the drastic increase of the water surface area, velocity and return flow of Dujiatai flood in the case of extra-large flood in Han River. Circulation of the scouring of the concave bank, as well as the aggravating of the fish-head bubbling flow and the increase of the sediment flow, the increase of sediment concentration, the safety of the Hanjiang River embankment, the stabilization of the gate body and the flood scouring and silting.