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本文根据多断面昼夜水文、泥沙观测,潮滩重复水准测量并借助~(210)Pb测年,分析了辽东湾北部潮滩和浅海区潮流及泥沙的分布和变化。结果表明:本区泥沙以纵向搬运为特征。双台子河口及西部来水来沙是东部沙洲和浅滩发育的主导因素。汛季大潮期,泥沙落淤在河口及附近浅海且泥沙自西向东运移;小潮期,泥沙除纵向扩散外(向东),存在净向海搬运。调查期滩面淤积强度自西向东减弱。高、中浓度泥沙浑位置与盐度梯度区的上部界面相符,多出现在25—30km以内的岸段(水深10—13m),30km以外泥沙骤减,海水亦由黄棕色变为兰绿色。
In this paper, the distribution and changes of tidal current and sediment in the tidal flat and shallow sea area of the northern part of Liaodong Bay are analyzed based on the multi-section diurnal hydrology and sediment observations, tidal flat repeat leveling and ~ (210) Pb dating. The results show that the sediment in this area is characterized by longitudinal transport. Shuangtaizi Estuary and water and sand coming from the west are the dominant factors in the development of sand banks and shoals in the east. During the flood season, sediment is silted in the estuaries and nearby shallow sea and the sediment is transported from west to east. In the small tide period, sediment is transported to the sea in addition to the longitudinal diffusion (eastward). During the investigation period, the siltation intensity on the beach surface weakened from west to east. High and medium concentrations of muddy muddy place correspond to the upper boundary of the salinity gradient zone, mostly occurring in the shores of 25-30km (water depth of 10-13m). Sediment is drastically reduced beyond 30km and seawater is also changed from yellow-brown to blue green.