玄武湖风生流数值模拟研究

应用浅水湖泊风生流计算的二维有限元数学模型，对玄武湖风生流进行了数值模拟，并研完了玄武湖6m／s东南风风生流的历时变化特征及4m／s6种风向(E，W，S，N，ESE，WNW)下的稳定风生湖流特征．结果表明：6m／s风作用1h后在玄武湖开阔水域一般可形成稳定流场；稳定风生流场可以划分为逆时针环流主导型、顺时针环流主导型和过渡型3种类型；不同方位风场作用形成的稳定的风生流流态是不同的；对峙方位风场形成的风生流流型相似，流向相反．

Numerical simulation of wind-driven current in Xuanwu Lake

The 2-D Galerkin FEM model was used to simulate the wind-driven current in the Xuanwu Lake. The duration variation of the current field induced by SE wind of 6?m/s and the characteristics of stable flows under the action of wind of 4?m/s in 6 directions, including E, W, S, N, ESE, and WNW, were studied. The results show that the stable wind-driven current field occurs in open areas of the Xuanwu Lake after 1?hour action of wind of 6?m/s. The stable wind-driven current fields can be divided into three types, i.e. the clockwise circumfluence, the counterclockwise circumfluence, and the transient circumfluence. It is also indicted that the flow patterns induced by winds in different directions are different, and that wind fields in opposite directions result in current fields with similar flow patterns but in opposite directions.