葛洲坝枢纽利用坝址处的葛洲坝岛和西坝岛把长江分割为大江、二江、三江的有利地形和二、三江在枯水期为滩地河床的条件,采用分期导流方式施工。第一期先围二、三江,修建二江泄水闸、电厂和三江冲砂闸、船闸,从大江宜泄流量,照常通航,第二期截断大江,迫使江水改从二、三江建筑物宣泄(见图1),进行大江电厂、冲砂闸和船闸的施工,并利用大江上游围堰拦蓄库水,一期工程发挥通航发 Gezhouba Dam uses Gezhouba Dam and Xiba Island at the dam site to divide the Yangtze River into favorable terrains of the Yangtze River, the Erjiang River and the Sanjiang River and the conditions of the second and the third rivers for the riverbed in the dry season. The first phase of the first two Wai, Sanjiang, the construction of the two rivers, sluice gates, power plants and Sanjiang red sand gate, ship lock, flow from the river to the discharge, as usual navigable, the second phase cut off the river, forced the river to change from two or three buildings vent See Figure 1), the implementation of the Dajiang Power Plant, Chongzha sluice and ship lock, and the use of the upper reaches of the cofferdam blocking reservoir water, a project to play through traffic hair