崎头洋附近群岛水域泥沙特征及悬沙来源分析

Analysis on sediment characters and source of suspended sediment in archipelago sea waters around Qitou Ocean

依据实测水文泥沙资料分析舟山群岛南部崎头洋附近海域的悬沙与底沙特征,建立该水域二维潮流数学模型,同时根据底沙及悬沙的粒径分布和潮流的运动路径对该海域的悬沙来源做进一步分析。指出崎头洋附近群岛海域的悬沙除部分来源于潮汐动力作用下的底沙起动再悬浮之外,主要是杭州湾附近灰鳖洋水域的泥沙在潮汐动力作用下经群岛西北方向水道进入群岛内部水域的,进而在潮动力作用下经由东南方向水道进入东海及象山港附近水域。

Based on field hydrology and sediment data, characters of suspended sediment and bed load around Qitou Ocean in the south of Zhoushan Archipelago are analyzed, and the 2D tidal current numerical model about this sea area is established. Meanwhile, the source of suspended sediment is further analyzed considering particle size distribution of sediment and moving path of tidal current. Then, it is indicated that part of suspended sediment around Zhoushan Archipelago area originates from sediment incipient motion and re-suspension; in addition, owing to transport function of tidal current, other sediment mostly comes from Huibie Ocean near the Hangzhou Bay, and moves into Qitou Ocean through channels in the northwest of Zhoushan Archipelago, and then enters into East China Sea and Xiangshan Port water areas through channels in the southeast of Zhoushan Archipelago.