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苏北海岸长达千里,除北部连云港地区为砂质山地港湾岸外,其余大部分为淤泥质平原海岸。第四纪以来,由于黄河的南北迁徙及长江口的南移,使苏北海岸的动态平衡不断遭受破坏。特别是1855年黄河改道入渤海后,苏北海岸中、南段(射阳河口至启东咀之间)的动态变化十分复杂。弶港以北,岸滩强烈淤涨;掠港以南,岸塌后退,滩面淤涨。
The coast of northern Jiangsu is a thousand miles away, with the exception of the sandy mountainous harbor bay in the northern part of Lianyungang. Most of the rest is the silt plains coast. Since Quaternary, due to the north-south migration of the Yellow River and the southward migration of the Yangtze River estuary, the dynamic balance of the coast of North Jiangsu has been continuously damaged. Especially after the diversion of the Yellow River into the Bohai Sea in 1855, the dynamic changes in the middle and south sections of the coast of North Jiangsu (between Sheyang Estuary and Qidong Tsui) are quite complicated. To the north of Hong Kong, there is a strong uplift of the shore beach; south of the harbor, the shore retreats and the beach surface rises.