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一、坝址的自然条件葛洲坝水利枢纽位于长江干流湖北省宜昌市北郊,上距三峡出口南津关2.3公里,下距宜昌市约6公里。长江出南津关后,由高山峡谷河段进入丘陵宽河谷段,坝址处江面宽2200米,有葛洲坝,西坝两个小岛,将长江分割成大江,二江和三江,右侧大江为主河道,二江和三江枯季断流。枢纽以上集水面积为100万平方公里,约占全流域面积的55%。宜昌站多年平均流量为14300秒立米,多年平均径流量为4529亿立米,汛期水量占全年
I. Natural Conditions of Dam Site Gezhouba Dam is located in the northern suburb of Yichang City, the main stream of the Yangtze River in Hubei Province. It is 2.3 km away from the Nanjin Exit of the Three Gorges Reservoir and about 6 km away from Yichang City. After leaving the Yangtze River, the Yangtze River valley enters the wide valley section of the hilly valley where the river surface is 2,200 meters wide. There are two small islands, Gezhouba and Xiba. The Yangtze River is divided into two major rivers, two rivers and three rivers. Main rivers, two rivers and three rivers off the dry season. Above the hub catchment area of 1 million square kilometers, accounting for about 55% of the basin area. Yichang Station for many years the average flow rate of 14,300 seconds of legislation, the average annual runoff of 452.9 billion cubic meters of water flood season accounted for the whole year