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壩区壩段的选择三峡自奉节至宜昌系由三个主要峡谷:瞿塘峡、巫峡及西陵峡所组成,全长205公里。峡谷内岸陡、河狭、水深,流急。洪枯水位变幅在30公尺以上。除水运外无陆路交通。三峡在地质构造上都是由近乎垂直河道的大背斜所组成,全区主要系沉积岩,只在下段西陵峡的中部黄陵背斜地区系花岗岩区。在背斜东翼峡谷出
Selection of Dam Area Dam Three Gorges from Fengjie to Yichang are made up of three major canyons: Qutang Gorge, Wu Gorge and Xiling Gorge, with a total length of 205 km. The inner canyon steep, narrow river, deep, impatient. Floating flood level at 30 meters above. In addition to water without land transport outside. The Three Gorges are all composed of the large anticlines of nearly vertical rivers in the geological structure. The whole area is mainly composed of sedimentary rocks, and the granite area is only found in the Huangling anticline area in the lower part of Xiling Gorge. In the anticline East Wing out of the valley