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一、概述建国以来,江苏沿海地区水利建设取得了很大成绩,新开挖人工河道总长1068公里,总排洪能力约1.2万立方米/秒,农田水利基本建设完成土方55亿立方米,为改善农业生产条件发挥了积极作用。但进入八十年代后,工程效益出现衰减趋势,其主要原因之一就是沟河淤积严重,引排能力下降,特别是水土保持工作未能跟上,加剧了水土流失,致使沟河逐渐淤浅,工程效益衰退,影响正常排灌。据南通市1985年调查,沟河一般淤高1—1.5米,全市12条一级河,淤积土方达0.8
I. Introduction Since the founding of the People’s Republic of China, great achievements have been made in the water conservancy construction in the coastal areas of Jiangsu. The total length of newly excavated artificial channels is 1068 km and the total discharge capacity is about 12,000 cubic meters / second. The capital construction of irrigation and water conservancy projects has completed 5.5 billion cubic meters of earthwork Improve the conditions of agricultural production has played an active role. However, since the 1980s, the declining trend of engineering benefits has emerged. One of the main reasons for this is the serious siltation of the ditch and the reduction of drainage capacity. In particular, soil and water conservation efforts have failed to keep pace with the water and soil erosion, , Engineering benefits decline, affecting normal irrigation and drainage. According to a survey conducted in 1985 by Nantong City, Doushui River generally has a silt height of 1-1.5 meters. There are 12 first-class rivers in the city and a silting earth reaches 0.8