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太湖风生流的三维数值模拟
引用本文:梁瑞驹,仲金华.太湖风生流的三维数值模拟[J].湖泊科学,1994,6(4):289-297.
作者姓名:梁瑞驹  仲金华
作者单位:河海大学水文系 南京210098(梁瑞驹),河海大学环境水利研究所 南京210098(仲金华)
摘    要:建立了太湖三维风生流数值模型,并用差分法求解;垂直方向上采用了坐标变换技术,把任一节点的水深转换成无量纲水深,从而有效地消除了因风力作用造成的自由水面波动和湖底不规则的影响;水平面上采用锯齿网格处理,对于四周以闭边界为主的湖泊水域,显得比较合理。计算结果表明,湖泊风生流沿垂直、水平方向都有较大变化,流向上下、水平也并不一致,这是湖泊水流区别于其它水域水流之所在。计算模拟显示所建模型的有效性和可操作性。

关 键 词:太湖  风生流  数值模拟  湖泊
收稿时间:1993/4/15 0:00:00
修稿时间:1993/12/30 0:00:00

A three-dimensional numerical simulation of wind-driven water current inTaihu Lake
Liang Ruiju and Zhong Jinhua.A three-dimensional numerical simulation of wind-driven water current inTaihu Lake[J].Journal of Lake Science,1994,6(4):289-297.
Authors:Liang Ruiju and Zhong Jinhua
Institution:Department of Water Resonrces and Hydrology, Hohai University, Nanjing 210098 and Institute of Hydraulic Environment, Hohai University, Nanjing 210098
Abstract:A three-dimensional numerical simulation on wind-driven current in Tauhu Lake is developed in this paper, in which the finite difference method is used. A dimensionless vertical coordinate is applied for the vertical grid regulation so as to eliminate the impacts of the wind-induced water level fluctuation and the irregular lake bottom forms. whereas grids with saw-toothed boundaries is applied along the horizontal dimensions when supposing the boundaries of the lake are closed.The wind data in July and August, 1988 are used in the numerical simulation of water level at Dapukou Station and Xukou Station. The comparison between the simulated and the observed results indicates certain consistancy. Further studies reveal that, when a constant 14 m/s SE wind dominates for 20 hours on the water surface, the water level at Dapukou St. increases 45 cm while the level at Xikou St. decreases 40 cm. The four-layer (surface, upper-middle, lower-middle, near bed) velocity fields obtained respectively show that the absolute velocity of the surface flow is about 1.2 m/s, while the bed flow is between 0. 3-0. 6 m/s but in the opposite direction. The simulation also reveals that the velocity field in the upper-middle layer change directions more frequently, which is in agreement with former researches done by foreigners.In conclusion, the wind-driven currents in lak es are very complicated, the representativeness of wind data is an important factor that affects the accuracy of numerical simulation. That the wind-induced current directions are vertically inconsistent and the velocity fields along the horizontal dimensions not evenly distributed is the characteristics of lake flow differed from that of other water bodies.
Keywords:Taihu Lake  wind-driven current  numerical simulation  increase and decrease of water level  finite difference method  simulation regulation  
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