以南水北调中、东线一期工程为例，利用二维水流数学模型计算分析了调水工程对长江口水流的影响。结果表明：调水工程实施后，长江口径流来量减小，涨潮动力略有增强，落潮动力略有减弱，潮位、流速、各通道分流比等均发生一定程度的变化，但总体变化幅度不大，对长江口水动力特性影响较小。

To take South-to-North Water Transfer Project’s middle route and east route for an example， the influences on Yangtze River estuary’s flow character after transferring water are analyzed. The results show that the amount of runoff incoming water will decreased， rising tide force increase， falling tide force decrease and tidal stage， current velocities，diversion ratios of every channel correspondingly change after transferring water，but there will be only little variation overall.