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一、湖荡面积演变趋势和原因里下河腹部地区位于淮河下游的江苏中部,总面积1165平方公里。该区由古泻湖演变而成的碟形洼地,周边高,中间低,四周地面高程为3～5米(废黄河口零点),中间洼地一般为2米左右。境内沟河交错成网,湖荡密布,湖荡高程一般为O～1米,是天然的涝水承蓄区,可以调蓄里下河腹部60％的雨涝产水量。但由于多种原因,各地竞相圈圩,使现有湖荡面积比1965年减少了4/5。据资料测算统计,1965年
First, the trend and reason for the evolution of lake area The lower river belly area is located in the central part of Jiangsu Province, which is located in the lower reaches of the Huaihe River with a total area of 1165 square kilometers. The area evolved from the ancient lagoon disc-shaped depression, around the high, low in the middle, around the ground elevation of 3 to 5 meters (waste Yellow River estuary zero), the middle depression is generally about 2 meters. The territory of the ditch intertwined into a network, the lake is covered with cloth, the lake is generally 0 to 1 meter elevation, is a natural waterlogging catchment area, you can regulate the lower reaches of the river 60% of the waterlogging rainfall. However, due to a variety of reasons, competing around the fair, so that the existing lake area than in 1965 decreased by 4/5. According to statistics statistics, 1965