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本文从长江河口水流和泥沙运动的特性,论述长江口河床演变的特征有三:(1)沙岛浅滩使水道有规律地分汊。(2)南冲北淤沙岛北移。(3)落潮主泓摆动,南北港交替兴衰。根据这些特征对南支南北港的治理认为必要条件有三:(1)南北港分水分沙要基本平衡,防止落潮主泓的偏移。(2)固定分汊口不使继续后退。(3)稳住扁担沙,防止滩槽的剧烈变动和大量泥沙下移。
Based on the characteristics of water flow and sediment movement in the Yangtze River estuary, this paper discusses three characteristics of the riverbed evolution in the Yangtze Estuary: (1) Sand Island Shoal shoals the waterways regularly. (2) South red sand silt island north move north. (3) Lord ebb swing, north-south port alternately rise and fall. According to these characteristics, the governance of Nanzhuang North-South Harbor is considered to have the following three requirements: (1) The separation of water and sediment should be basically balanced between the North and South ports to prevent the migration of the main ecliptic. (2) Fixed points do not make the mouth continue to retreat. (3) stabilize the Pangsha sand to prevent drastic changes in the trough and a large amount of sediment down.