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受潮汐影响的河口三角洲,其滨海部分常分布有宽阔的潮滩,它的冲淤变化不仅涉及岸滩的利用和防护,而且与口门航道水深的维护密切相关.根据多次现场调查和定点观测资料,发现长江口潮滩冲淤存在着多年变化的长周期、季节性变化的年周期和暴风浪作用的短周期,其中暴风浪对岸滩的破坏性很大,而近岸潮流运动的不对称性却经常挟带泥沙上滩淤积.鉴于长江口南槽具有特殊的动力地貌条件,滩槽之间的水体和泥沙交换频繁,特别是大风天气,航道拦门沙的淤浅常受两侧边滩的影响.常风向和强风向可以控制口门地区岸线的走向,一当岸滩形成以后,海岸廓线又可以限制和调节不同风向条件下近岸波浪、水流和泥沙运动的强度.
In estuarine delta affected by the tides, its tidal flat is often distributed along the coast and its erosion and deposition not only relate to the utilization and protection of shore beaches, but also to the maintenance of the waterway at the mouth gate.According to several on-site surveys and fixed-point Observational data show that there are long-term and seasonal changes in the tidal flat in the Yangtze River estuary and short periods of storm-induced waves, of which the storm is very destructive to the shore, while the tidal current in the near-shore Symmetry is often accompanied by sediment deposition on the beach .In view of the Yangtze River estuary south trough has a special dynamic topography, water and sediment exchange between beach trough frequent, especially in windy weather, waterway sand bar shallow stubborn The effects of both sides of the beach The tendency of the frequent winds and strong winds can control the coastline of the port area. Once the shoreline is formed, the coastline can limit and regulate the waves, water currents and sediment movement in different winds Strength of.