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崇明岛东部滩地受潮汐作用明显,波浪作用弱。滩地的淤涨速度快。沉积物以粉砂为主,自潮上带到潮下带,粒度增大,分选变好。潮上带泥裂多,具有水平层理。潮间带,潮下带以小水流波痕为主,小波痕交错层理发育。潮间上部具有浪成波痕、干扰波痕、流痕,波状、脉状、透镜状层理主要出现在该部位。波痕等表面构造随大、小潮变化。潮沟局限于潮上带和潮间带上部,边滩发育,有两种形态不同于河流沉积的点坝,沉积物大都呈双众数分布。
The beaches in the east of Chongming Island are obviously affected by the tides, with weak waves. The siltation of the beach is fast. Sediment dominated by silt, from the tide to the tidal zone, particle size increases, sorting better. Mud on the tide with more layers of bedding. Intertidal zone, the influx of small waves to the main stream, small bedding staggered bedding development. Waves into the upper tidal wave ripples, ripples, flow marks, wavy, veins, lenticular layering mainly in the site. Wave marks and other surface structures with large and small tidal changes. The tidal flats are confined to the upper tidal zone and the upper intertidal zone. There are two types of point dams which are different in shape from the river sediments. Most of the sediments are in dual mode.