黄、东海环流的数值研究Ⅱ潮及潮致环流数值模拟

A Numerical Study on Circulation in the Yellow and East China Sea Ⅱ Numerical Simulation of Tide and Tide-Induced Circulation

该文中数值模拟了黄、东海陆架区的四大天文潮及其潮致拉格朗日环流。运用“流速分解法”将线性三维分潮波问题化为一个分潮潮位及深度平均流的二维问题和一个流速垂向剖面问题求解。其二维问题的底摩擦系数由三维模式导出 ,所导得的线性底摩擦力公式更符合物理意义 ,且避免一般二维模式中底摩擦力的经验假定。结果表明 ,三维模式完全可以通过准二维方法求解 。

The four major astronomical tides and their corresponding Lagrangian tide induced circulations are simulated numerically in the Yellow Sea and the shelf area of the East China Sea. By applying the SCM (Splitting Current Method) to the model the linear 3D tidal constituents equations are transformed into a tidal elevation equation, a 2D depth averaged current equation and the solution of a vertical current profile. The bottom friction coefficient in the 2D case is deduced from the 3D model. It reflects a clear physical understanding and avoids the empirical assumption made in the normal 2D model for the bottom friction. It shows that in this paper the 3D numerical model can be solved by a quasi 2D model and thus skip the tremendous computation in the normal 3D model.