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一、历史的回顾 长江全长6300余公里,流域面积180万公里~2,年平均迳流量9280亿米~3(在宜昌处为4510亿米~3),落差5400米,其长度居我国之首、世界第三。流域内耕地面积3.65亿亩,人口3.5亿。1985年全国有17个城市工业总产值超过100亿元,长江沿岸即有9个。长江流域的工业、农业、商业、矿产资源、水利水电资源等在全国均占有极重要的地位。
I. Historical Review The Yangtze River, with a total length of 6,300 kilometers and an area of 1.8 million kilometers to 2 years, has an average flow of 928 billion meters to 3 meters (451 billion meters to 3 meters at Yichang) with a drop of 5,400 meters and its length ranks in China First, the world’s third. The basin area of 365 million mu of arable land, population 350 million. In 1985, the gross industrial output value of 17 cities nationwide exceeded 10 billion yuan, that is, there were 9 along the Yangtze River. The industrial, agricultural, commercial, mineral resources and water conservancy and hydropower resources in the Yangtze River Basin all occupy a very important place in the country.