苏北沿海浅水区,分布着形态十分独特的大型滨岸沙洲。由于它主要是潮流作用形成的,又大多处于水下,故简称“潮流暗沙”或“暗沙”。 1960年,我们在苏北沿岸进行水文和地质地貌调查时,发现在废黄河口以南、长江口以北的苏北沿海浅水区(水深在20—30米以内)分布着数十条潮流暗沙。它们分别以 North Jiangsu coastal shallow waters, the distribution of a very unique form of large coastal sandbar. Because it is mainly formed by the tidal current, and most are underwater, it is referred to as “tide shoal” or “shoal sand”. In 1960, when we surveyed the hydrology and geomorphology along the coast of northern Jiangsu, we found that a few dozen shoals of shoal sand distributed along the shallow coastal areas of northern Jiangsu north of the Yellow River Estuary and north of the Changjiang River estuary (with a depth of 20-30 meters) . They are respectively