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我国长江三角洲一带,在数万年之前,原是一片汪洋,由于长时期长江泥沙的冲击,才变成今天的陆地;同时,它一直在受海潮的冲击,历代沿海人民创造了与潮水作斗争的办法,就是筑海塘。 上海地区“捍海塘”,始于汉、晋,成于唐代,古称“捍海塘”。据“松江府志”记载:“唐开元(713～741)年间,重筑盐官(今盐海县)沿澉浦、平湖、金山、华亭、奉贤、南汇、川沙、宝山捍海塘。迄吴松江,堤长凡五百一十里。”今杭州湾中的王盘山与大小金山,原与上海有涂十八滩相连,唐代始坍没入海。元代加固才逐渐稳住这带岸线。到明代中叶,长江南水道
In the area along the Yangtze River Delta in our country, tens of thousands of years ago it was a vast ocean. Due to the long-term impact of the sediment of the Yangtze River, it has become the land of today. At the same time, it has been hit by the tidal waves. The solution to this struggle is to build a sea pond. Shanghai “defend Hai Tong”, began in Han, Jin, into the Tang Dynasty, the ancient name “defend Hai Tong.” According to “Songjiang Fuzhi” records: “Tang Kaiyuan (713 ~ 741) years, reconstruction of salt officer (now Yanhai) along Xupu, Pinghu, Jinshan, Huating, Fengxian, Nanhui, Chuansha, Baoshan defend the sea. Wu Songjiang, Embankment length of five hundred and eleven. ”Now Hangzhou Bay in the size of the Panshan and Jinshan, originally linked to Shanghai Eighteen Beach, the beginning of the Tang Dynasty slumped into the sea. Yuan Dynasty reinforcement gradually stabilize this belt line. To the mid Ming Dynasty, the Yangtze River South Waterway