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江苏海岸的一大特点是岸外内陆架上有一大片水下沙脊群。由于东海前进潮波系统和废黄河口外旋转潮波系统的西翼在弶港岸外相遇,故使东台县沿海一带成为这片沙脊的辐射中心区。 1974年以来,弶港地区海岸动态发生强烈变化。通过现场和卫片分析发现,1974年新发育成的大型潮汐水道把蒋家沙隔为两半,与上述变化有因果关系。而1974年特大天文大潮是造成蒋家沙被分为两半的主要因素。这次突变事件在条子泥西侧所带来的后果如下:1)王家槽西段潮位增高,涌潮加强,2)王家槽向西发展曲流超过了过去的最西界;3)王家槽东段淤浅,使条子泥和蒋家沙在该处并滩;4)条子泥南坡形成了新的潮汐支道,5)死生港大辐度西摆,严重冲刷西侧岸滩;6)川港淤积加速。
A major feature of the Jiangsu coast is a large underwater sand ridge on the offshore shelf. Due to the tidal wave system in the East China Sea and the west wing of the revolving tidal wave system outside the wasteland of the Yellow River, they meet outside the port area of Xingang Harbor, thus making the coastal area of Dongtai County the radiation center area of this ridge. Since 1974, the coastal area of Port-Kong has changed dramatically. Through on-site and satellite analysis, it was found that the newly developed large-scale tidal channel in 1974 divided Chiang’s house in two halves and had a causal relationship with the above changes. In 1974, the astronomical tide was the main factor that caused Chiang Kai-shek to be divided into two halves. The consequences of this catastrophe on the west side of the slime mud are as follows: 1) The tide level of the western part of the Wangjia Trough is increased and the tide is intensified; 2) the meandering westerly development of the Wangjia Trough exceeds the westernmost past; 3) 4) the southern side of the sloping mud formed a new tidal branch, 5) the loose tail port swirling westward, seriously washing the west bank of the coast; 6) Sichuan-siltation accelerated.