伶仃河口湾铜鼓水域水沙净输运分析

Analysis on the Net Transport of Current and Sediment in Tonggu Waters of Lingding Estuary

根据对珠江伶仃河口湾铜鼓水域丰水期９个测站大、中、小潮三次同步水文泥沙资料及５７个底质样品的分析结果，本文讨论了此水域的水沙净输运趋势。结果表明，铜鼓水域表层余流向海，浅滩测站中底层余流指向河口方向，欧拉余流主要由径流构成。沟槽悬沙输运以净平流作用为主，浅滩区则以向上游的潮抽吸输运为主。

Based on nine hydrologic stations′ data of spring,medium and neap tidal periods and fifty seven samples of sea bed surficial sediments collected in Tonggu Waters of Lingding Estuary during the river flood stage,this paper discusses the net transport trend of current and sediment. The results show that the surface residual current of the waters flows seaward,but the residual current of middle and lower layers in the shallow area flows landward.The Euler residual current is mainly composed of the river water. The transport of suspended sediment of the stations located in the trough is dominated by the net advection while the transport in the shallow area is controlled by the tidal pumping.The transport trend of the sea bed surficial sediment indicates that the Tonggu Shallows is the convergent zone of sediment from both the sea and the river.