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中文摘要：
长江口深水航道整治工程使得南港北槽开通12．5m水深航道，长江口河势及不同汉道动力条件随深水航道整治工程的完工发生了一系列的变化。利用长江口深水航道整治工程实施前后地形资料，分析出工程对长江1：7各汉道的地形变化的影响，同时应用上海河口海岸科学研究中心自主开发的平面二维模型模型计算了长江口流场变化，给出南北港、南北潮涨落潮分流比的变化，并分析了导致这种变化的主要原因。
英文摘要：
The water depth of navigational channel in the south channel and north passage is over 12.5 m after the Yangtze estuary deepwater channel regulation project. The river regime and flow dynamics condition of the Yangtze estuary changed after the project. The characteristics of bed transformation in the Yangtze river estuary is studied with actual underwater geomorphic data. The 2-D numerical simulation of tidal current SWEM2D of Estuarine ＆ Coastal Science Research Center of Shanghai is used to simulate the flow field in the Yangtze estuary. The change of flow ration of south channel and north channel, south passage and north passage, which is the main factor to the Yangtze estuary, is analyzed. The main reasons for the change of flow ration are also given.
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