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本文根据上海市1949年至1995年滩涂圈围使用的调查资料,对各个历史时期的圈围数量、圈围规模、圈围用途及地域分布进行了统计,对逐年围海造地与建设占用耕地在数量上作了比较,对圈围的投资、造价进行了静态和动态计算,对圈围垦区的农业产值作了分析,对代表性垦区进行了经济评估,从而使以往经济研究中常用的“上海围垦工程具有一定的经济效益”这一定性分析提升为定量分析。文中根据上海市的实际情况,提出了加大中、低滩涂促淤力度,结合长江口整治、开发长江口滩涂的对策,在满足保持上海市耕田总量平衡要求的同时,也达到束水攻沙,改善长江口通航条件的目的。
Based on the survey data of the area around the beach in 1949-1995 in Shanghai, this article makes statistics on the number of encirclement, encirclement, encirclement and geographical distribution in each historical period. The quantities were compared, the investment in the circle, the static and dynamic calculation of the cost, the analysis of agricultural output value of reclamation area, conducted an economic assessment of the representative reclamation area, so that in the past economic research commonly used Shanghai reclamation project has some economic benefits "This qualitative analysis upgraded to quantitative analysis. According to the actual situation in Shanghai, this paper puts forward some countermeasures to increase the intensity of middle and low tidal flats, combining with the remediation of the Changjiang Estuary to develop the tidal flats of the Changjiang Estuary. While meeting the requirement of maintaining the balance of total farmland in Shanghai, To attack the sand and improve the navigation conditions at the mouth of the Yangtze River.