在地形复杂山区修建水利枢纽时有许多方面不同于平原地区。其特点是:坝址狭窄;场地布置有限;主体和临时建筑物现场运输条件复杂;在上下游围堰间有限的范围内由于河道落差大流速大;下雨时以及洪枯水季节的日流量变幅大等。以上特点是选择导流方式及河道截流 There are many aspects that differ from the plains in the construction of a water complex in a complex mountainous terrain. Its characteristics are: the dam site is narrow; the layout of the site is limited; the transportation conditions of the main body and the temporary buildings are complex; the large flow velocity is large due to the river gap in the limited range between the upstream and downstream cofferdam; Large amplitude. The above characteristics is the choice of diversion and river closure