长江口整治工程对河口潮流的影响

采用沿水深积分的平面二维非定常流数学模型对长江口整治工程进行流场数值模拟，讨论了整治工程实施后不同的典型水文条件（平水年、洪水年、大潮汛）下沿江水位、流速、各叉道流量的变化。结果表明，工程后南支上段的徐六泾深槽落潮流速加大，长江流流稳定北偏进入白茆沙北水道；南支下段沿南岸一线的落潮速均有增加；长导堤固定了浏河沙，从根本上防止新浏河沙体的整体南压；南北港的分流比变化不大；北槽在工程后除局部区域外，全

Effects of Integrated Regulation Project on Tidal Flow in the Changjiang Estuary

The influences of the integrated regulation project of the Yangtze estuary on tidal flow fields were simulated numerically by using a depth integrated 2 dimensional model of unsteady flows. Based on the computational results obtained for typical hydrological conditions, the changes of tidal level, velocity and discharges of the branches produced by the regulation project were discussed. The computed results show that the maximum velocity of ebb flows increases within the Xuliujing deep channel in the upper river section of the South Branch and the major current enters the Baimaosha deep waterway towards a slight northern direction steadily. The maximum velocities of ebb flows along the southern bank of the Southern Branch are increased basically by the project construction. The Xin Liuhesha is protected to move south wards by the long dike which fixes the dynamic sands. The ratio of the ebb flow discharges between the Northern Passage and the Southern Passage seems to be not changed by the project. The velocities of the ebb flows in the Northern Channel increase basically after the project construction, except some local area near the parallel dikes. It is recognized that the regulation project will not cause harmful effects on hydrodynamic condition in the navigation channels, flood control and drainage along the bank of the Yangtze estuary.