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上海北扼长江口,面濒杭州弯,东临东海。由于长江径流每年挟带着近5亿吨泥沙下泄入海,至河口区域,因水流扩散,挟沙能力降低,又受海潮上溯顶托,加是咸淡水交融使泥沙悬粒絮凝沉降等多种因素的综合作用,约有半数泥沙在长江口和杭州湾北岸区域沉积,形成众多的江心沙洲,河口沙岛和水下三角洲,并使江边海边滩涂不断淤涨,从而为上海带来了源源不断的滩涂土地资源,有利上海陆域不断扩大。一、滩涂利用现状
Shanghai north of the Yangtze River estuary, face near Hangzhou bend, east of the East China Sea. Since the Yangtze River runoff carries nearly 500 million tons of sediment into the sea every year and reaches estuarine areas, due to the spread of water flow, the sediment carrying capacity is reduced and the tides are traced back to the top. The addition of fresh and brackish water causes the flocculation and sedimentation of sediment and so on About half of the sediments are deposited in the Changjiang Estuary and the northern bank of the Hangzhou Bay. As a result, a large number of river sand bars, estuarine sand islands and underwater deltas are formed, and the silt up the waterfront of the riverside keeps rising. As a result, A steady stream of beach land resources, conducive to the continuous expansion of land in Shanghai. First, the status of beach utilization