三峡工程对长江口岸滩的影响

Influence of Three Gorges Project on Yantze River Mouth Waterslde Foreland

三峡工程的兴建将改变河流的来水来沙条件，必然地给坝址下游至长江口地区带来一系列影响。根据多次长江口水下地形资料，分析研究了长江口内外岸滩各自的演变规律，得出口内岸滩“的坍失并非上游来沙量的减少，而是河床淤积、主槽摆动所致；通过点绘上游来沙量与口外南汇边滩的冲淤变化关系图，发现两者存在良好的线性关系。同时综合分析了三峡工程坝址以下河床情况，对三峡工程兴建后大通站泥沙量作了估算，从而预测三峡工程对长江口内外岸滩的影响。

he Construction of Three Gorges hydropower project will change the water sediment regime,and hence to bring about influence over from lower reaches to the river mouth.After studying the process of waterside bank and waterside foreland at the Yangtse River mouth according to many underwater topographic data,it is gotten that landslip of waterside bank inside the mouth is not due to reduction of sediment yield but because of riverbed silt and main stream change.The relationship between the annual sediment yield and the change of erosion-deposition can be found by drawing out those data points.And consequently,the effects of the Three Gorges Project on waterside foreland can be estimated.