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长江下游地区,地处我国东部,西起江西省的湖口,东至上海市东北部的长江口,东西长约760公里。本区在大构造方面,正好位于我国东部北东东方向近于东西向的构造下沉区,第四纪以来长江及其支流所带来的大量的疏松物质在区内沉积较厚,形成了我国东部重要的冲积平原之一。以平原的成因和形态类型划分,长江下游平原可分为仪征以西河漫滩冲积平原、仪征以东现代三角洲平原及太湖平原(见附图1)。平原上河网密布、湖泊众多,土地
The lower reaches of the Yangtze River, located in eastern China, west of Hukou in Jiangxi Province, east of Shanghai’s Yangtze River Estuary in the northeast, east-west length of 760 km. In the area of large structure, the area is located in the tectonic subsidence area near east-west direction in the east, northeast and east of our country. Since the Quaternary, a large amount of loose material brought by the Yangtze River and its tributaries has been deposited thickly in the area, One of the important alluvial plains in eastern China. Divided by the causes and morphological types of plains, the plains of the lower reaches of the Yangtze River can be divided into the alluvial plain of the west of Yizheng, the delta plain of the east of Yizheng and the plain of Taihu Lake (see Figure 1). River plain in the plain, many lakes, land