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介绍了三峡工程大江截流的特点；根据龙口宽度的大小将其处理为梯形或三角形断面，并分别应用宽顶堰理论，建立了大江截流期龙口水力学要素计算模型
According to the width of the Longkou, it is treated as a trapezoid or triangular section, and the theory of wide crest weir is applied respectively to establish the computational model of the hydraulics of the Longkou river closure phase