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根据海岸带和海岛两次调查的实测资料和水下地形图，用动力地貌学方法对长江口三岛岸滩剖面的形态和冲淤变化进行研究。结果表明，分汊河口冲积岛岸滩有“江岸型”、“洲头型”和“潮滩（tidalbeach）型”三种基本类型；河槽变迁导致“江岸型”岸滩发生数年周期的变化，岸滩的季节性变化受风、海面、潮差和含沙量等多种因子影响，台风和寒潮则引起周期更短的“风暴旋回”，受植被保护的沼泽滩面的冲淤过程与光滩截然不同。
According to the measured data and the submarine topographic maps of the two surveys of the coastal zone and the island, the morphological changes and scouring and silting changes of the beach profile of the three islands in the Changjiang Estuary were studied by dynamic geomorphology. The results show that there are three basic types of “river bank”, “continent head” and “tidalbeach” in the alluvial islets along the Fenhe Estuary; The seasonal changes of shore beach are affected by many factors such as wind, sea surface, tide difference and sediment concentration. Typhoon and cold wave will cause a shorter cycle of “storm swirling”, and the scouring and silting process of vegetation-protected swamp beach surface and Light beach completely different.