高含沙高水流海区工程布置对泥沙运动的影响

根据现场实测资料,分析了洋山深水港区的水文泥沙特征,提出了封堵汊道、平顺水流、安全靠泊、减小淤积等建设深水大港的基本原则。论述了水流强弱是港口建成后,维护要求水深的关键,也是随工程布置唯一可变的因素。从而得出如下主要结论:工程方案布置应尽量保持现有水流条件,特别是港池和航道水域;在岸线开发利用上,应视自然水深大小而定;小洋山汊道全部封堵后,势必造成主通道涨、落潮量的减小。适当缩窄西口门宽度,确保主通道水流单宽流量维持现有水平,应是今后进一步研究的课题之一。

Influence of project layout in sea area with high sediment concentration and high flow on sediment motion

Based on field measured data,hydrologic and sediment characteristics in Yangshan Deep-water Harbor Area were analyzed.Then the construction principles of large deep water port such as blocking branch channels,smoothing water flow,ensuring berth safety and reducing siltation were put forward.It has been explained that flow strength,which is the only factor varying with different project layout schemes,is the key to maintain the required water depth after the completion of the harbor.The following conclusions are obtained: the project layout should preserve the present current condition as much as possible,especially in harbor basin and channel area.The exploitation and utilization of the sea shore should be decided according to natural water depth.As the blocking of the whole Xiaoyangshan branch,the flood volume and ebb volume certainly will be reduced.Thus it should be one of the future research tasks to narrow west entrance properly and insure that the unit discharge in main channel maintains existing level.