长江口悬沙锋及其对物质输移的影响

本文通过长江口水域多次水文测验，取得了大量的水流和悬浮体等资料，又进行了锋面现象跟踪观测。从而表明长江口分布了范围宽广的悬沙场，并形成了含沙量梯度较大的悬沙锋。悬沙锋受自然条件的影响，时空变化较为复杂，可出现内，外两个锋面，锋面是清，浑水接触带，促使悬浮体絮凝和沉积，因此悬沙锋的消长和进退对悬浮体起着过滤效应，长江口外北冲南淤的格局和水下三角洲的廓形与悬沙锋平面形态基本上相吻合，反映悬沙锋对物质输

Suspended Sediments front and its Impacts on the Materials Transport of the Changjiang Estuary

A broad suspended sediments field and its front with the larger sediment concentration gradient are showed through in situ multi-hydrological and tracing observations in the Changjiang Estuary. The time-space variation of the front is complicated due to natural conditions. Basically there may be two suspended sediments fronts at the inside and the outside.The front is the contact zone of both water bodies so makes the suspended matter flocculent and deposited. The growing or lossing and advance or regress of the suspended sediments front can play the role of filtraction to the suspended matter. The feature which is to be eroded at the north of the estuary and deposited at the south and the outline of submerge delta are basically consistent with the plan shape of the suspended sediments front. It shows that the suspended sediments front plays an important action to the' exchange of sediments of the Hangzhou Bay.