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本文应用 ECOM模式 ,设计 1个控制试验 ,研究理想河口环流和盐水入侵的动力过程。数值计算结果表明 ,盐水入侵产生盐度锋面 ,在锋面处底层存在着向陆的密度流 ,为保持断面上质量连续 ,上层的流速趋于增大 ;近口门附近底层流有偏南分量 ,表明有横向环流存在。在口门外因斜压和底形的作用 ,产生明显的上升流。盐水入侵在空间上具有不对称性 ,高盐水位于北岸的下层。在拦门沙上游出现上下 2个相反方向的横向环流 ,而在口门处只出现 1个顺时针方向的横向环流。从动力机制上分析了盐水入侵的空间不对称性和横向环流的产生。
In this paper, ECOM model is used to design a control experiment to study the dynamic process of ideal estuarine circulation and salt water intrusion. The results of numerical calculation show that the salinity front is produced by salt water intrusion, and the density flow to the land is present at the bottom of the salient front. In order to maintain the continuous mass on the cross section, the velocity of the upper layer tends to increase; It shows that there is horizontal circulation. In the mouth outside the baroclinic and the role of the bottom shape, resulting in significant upward flow. Saltwater intrusion is asymmetric in space, and high-salinity water is located below the North Shore. In the upper reaches of sand bar there are 2 vertical and horizontal reverse circulation in the opposite direction, and only a clockwise at the mouth of a transverse circulation. From the dynamic mechanism, the spatial asymmetry of salt intrusion and the generation of lateral circulation are analyzed.