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一、汉江下游河道形势汉江是长江流域最大的支流之一,洪水期集水面积为142000平方公里。丹江口水利枢纽位于流域上、中游交界处,集水面积95200平方公里。汉江中游(丹江口水利枢纽至皇庄,简称丹～皇区间)集水面积46800平方公里,区内支流众多,地形复杂,下垫面差异大,降雨不均,没有水文站控制的面积约占二分之
First, the Han River downstream channel situation Han River is one of the largest tributaries of the Yangtze River Basin, flood catchment area of 142000 square kilometers. Danjiangkou Water Control Project is located in the basin, the junction of the middle reaches, catchment area of 95200 square kilometers. Hanjiang River (Danjiangkou water conservancy hub to Huangzhuang, referred to as Dan ~ Imperial zone) catchment area of 46800 square kilometers, many tributaries in the area, complex terrain, underlying surface differences, uneven rainfall, there is no hydrological station control area of about two points It