长江口南北支二维氯度数学模型

2-D CHLORINATE NUMERICAL MODEL FOR SOUTH AND NORTH BRANCHES OF YANGTZE ESTUARY

枯水大潮期间，长江口北支向南支倒灌盐水，使南支河段和黄浦江水质恶化。，多年来这一问题为各界所重视。本文采用二维数学模型模拟了南北支水流和氯度的变化。数学模型经验证以后，计算了封堵北支方案，分析了工程前后含氯度变化情况。封堵北支后，切断了北支向南支倒灌盐水的来源，南支河段含氯度大幅度下降。

The salt water flowing into the South Branch from the North Branch is one of the major water pollution sources in the Yangtze and the Huangpu estuaries during the spring tide of dry seasons. A 2-D chlorinate numerical model was developed to simulate the distribution of the chlorinate both in the South and North Branches. The numerical model was used to Compute flow and chlorinate variations after blocking the North Branch. It was indicated that the volume of the chlorinate in the South Branch decreased rapidly because of cutting off the source of chlorinate from the North Branch.