太湖风生流特征的数值模拟研究

Numerical study on the characteristics of wind-induced current in Taihu Lake

该文基于对太湖地形和水动力特征的分析,建立了沿垂向平均的太湖二维浅水动力学模型,给出了模型参数和模型的数值求解方法。通过对太湖风生流的模拟,分析了太湖风生环流的基本形态特征,并得到了实测流场的良好验证。进一步对盛行风场下的太湖流场和水动力特征进行数值研究表明,太湖风生流的形成主要由风场、湖泊边界及湖底地形决定;得到了不同湖区的流动规律和水动力特征,并揭示了不同湖区流动差异的形成原因。

In this paper, a depth-averaged two-dimensional hydrodynamic model for Taihu Lake was developed, and the some parameters and numerical approach of the model were given based on understanding the characteristics of landform and hydrodynamic of Taihu Lake. By numerical simulating, the basic modalities of the wind-induced current of Taihu Lake were analyzed, and the model was verified by comparing with data of the survey current. Further more, the performances of the wind-induced current and hydrodynamics of Taihu Lake in the prevailing wind were simulated, the results show that the wind-induced current in Taihu Lake is formed by the wind, the lake boundary and the landform of the lake bottom as well. There are obvious different taws of the current and hydrodynamics in different lake regions, and the reason caused the difference is analyzed with the fluid flow mechanism.