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(一)汉江是我国四大名川——江淮河汉——之一,也是长江最大的一条支流。发源于陕西省凤县秦岭南麓,流经陕西、湖北两省,在武汉与长江相汇。流域面积约17万余平方公里,北部与黄河流域接壤,东北部与淮河流域毗邻。流域内山地多、平原少,上游地区(丹江口以上为上游)几乎全属山地和丘陵,只有一块较大的汉中盆地和一些零星的小块河谷平原,中下游地区(丹江口至锺祥为中游,锺袢以下为下游)山地丘陵和平原各占一半。汉江干流全长约1,530公里,从河源到河口的水面落差共约1,850米,每年平均流入长江的水量约有560亿立方米,略大于黄河入海的水量。由于汉江有丰
(1) The Han River is one of the four famous rivers in China, the Han River and the Han River, and also the largest tributary of the Yangtze River. Originated in Qinling County, Shaanxi Province, south of Qinling, flows through Shaanxi and Hubei provinces, in Wuhan and the Yangtze River together. The basin area of about 170000 square kilometers, bordering the Yellow River Basin in the north, adjacent to the Huaihe River Basin in the northeast. There are many mountainous and plains in the basin, with few plains. Almost all of the upper reaches (upper reaches of the Danjiangkou) are mountainous and hilly. There is only one larger Hanzhong basin and some sporadic small valley plains and middle and lower reaches (from the middle of Danjiangkou to Zhongxiang, Zhong 袢 below is the downstream) mountainous hills and plains each half. The total length of the Hanjiang River is about 1,530 kilometers. The water surface drop from Heyuan to the estuary is about 1,850 meters. The average annual flow of water into the Yangtze River is about 56 billion cubic meters, which is slightly larger than that of the Yellow River into the sea. As the Han River abundance