海坛海峡二维潮流场数值模拟

Numerical simulation of two-dimensional tidal current model for Haitan Strait

海坛海峡为南北狭长型海峡，海峡内潮波属于前进波．本文建立了平面二维浅水波数学方程，利用欧拉-拉格朗日差分方法得到数值解，模型采用随时间变化的动边界技术，成功地模拟了海坛海峡的前进波特征，并根据实测数据进行了验证．同时计算了同潮时线和等振幅线，不同时刻的潮流场和潮流平均流速分布．计算结果表明，北部湾口M2分潮高潮时间比南部湾口早约5～6min，等振幅线范围约为2．12～2．15m．海峡内流速分布呈南北强、中间弱的特点，最大流速1m／s左右．

Haitan Strait is a south-north and long restricted channel strait, tidal wave in the strait belongs to progressive wave. A two-dimensional shallow flow equation is present and solved with semiimplicit and Eulerian-Lagrangian finite difference method. A variable boundary with time-variation technology is applied. The model described characteristic of progressive wave in the strait. The computed results show good agreement with the measured data. Meanwhile, co-phase lag and co-amplitude curves for the M2 constituent, and tidal current field, and distribution of mean flow velocity is computed. The result shows that, the high tide time for the M2 constituent at the north bay is about 5 -6min earlier than the south bay,co-amplitude level for the M2 constituent is 2.12 -2.15m, and the maximum current velocity about 1 m/s.