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一、流域地形概况汉江流域位于东径106°1′至114°14′北纬30°08′至34°11′之间,呈一狭长形,为长江流域大支流之一。地势西北高而东南低;河道弯曲系教1.78,流域均匀系数2.57;河道长1,530公里;流域面积174,000平方公里。河源至丹江口长881公里为上游段,河道介于山脉之间,基本上为峡谷,间有少数盆地,河槽宽窄与峡谷盆地相应;丹江口至马良力中游段,长322公里,两岸山势已渐开展,河槽在低水时宽300～400公尺,洪水时丹江口至碾盘山河段间水面宽可至8,000～10,000公尺,与唐白河尾闾结成一片,容蓄量较大,对其下游的洪峰削减起一定作用;马良以下为下游段,长329公里,河身位于平原地带,水面比降甚平,
First, the basin topography Hanjiang River Basin is located in the east longitude 106 ° 1 ’to 114 ° 14’ latitude 30 ° 08 ’to 34 ° 11’, a narrow shape, as one of the tributaries of the Yangtze River. The terrain is high in the northwest and low in the southeast. The curvature of the river channel is 1.78, and the average coefficient of the river basin is 2.57. The length of the river channel is 1,530 km and the drainage area is 174,000 km 2. 881 km from Heyuan to Danjiangkou is the upper reaches of the river between the range of the mountains, basically a canyon, between a few basins, fluvial width and valley basin corresponding; Danjiangkou to Ma Liangli middle reaches, 322 km long, both sides of the mountain has gradually The river channel is 300-400 meters wide at low water. During the flood, the water surface from Danjiangkou to Nian Panshan reaches 8,000 ~ 10,000 meters. It forms a slice with the tail of Tangbaihe River and has a large capacity. Of the peak reduction play a role; Ma Liang following the downstream section, 329 km long, the river is located in the plains, the water level is very flat,