长江口南汇咀近岸水域泥沙输移途径

南汇咀近岸水域位于长江口和杭州湾的交汇带 ,其动力条件、泥沙运移、沉积过程和地貌演变复杂。根据长江口南汇咀近岸水域的水文泥沙观测和沉积地貌等资料 ,通过综合分析研究 ,探讨了长江口入海水沙在南汇咀近岸水域与杭州湾的交换和泥沙输移途径。研究结果表明 ,沿南汇水下沙咀存在一个泥沙通道 ,长江口水沙在多种动力因子的驱动下经过该通道直接进入杭州湾 ,参与杭州湾水沙的周期变化。通过进一步研究还发现 ,长江口泥沙以异重流的方式向杭州湾输移

SEDIMENT TRANSPORT ALONG THE NANHUI SUBMERGED SPIT OF THE YANGTZE ESTUARY

The nearshore around the Nanhui Spit is a transitional zone between the Yangtze Estuary and the Hangzhou Bay with complicated dynamic conditions, sediment transport, sedimentological processes and morphological evolution. Based on a great amount of hydrological and sediment data and the submerged spit evolution analysis, this paper discusses the sediment exchange between the Yangtze Estuary and the Hangzhou Bay and sediment transport along the Nanhui Submerged Spit. The results suggest that a sediment passage occurs in the nearshore of the Nanhui Spit. The sediments from the Yangtze Estuary transport into the Hangzhou Bay by densimetric flow through the passage.