基于FVCOM的渤、黄海M_2分潮的数值模拟

Numerical Simulation of M_2 Sub-Tide In Bohai and Yellow Sea Based on FVCOM

本文基于有限体积方法的海洋数值模式FVCOM,对渤、黄海M2分潮潮汐、潮流进行数值模拟。模式水平采用不规则三角形网格,较好地拟合曲折岸线并提高近岸海域的网格分辨率;底摩擦采用数值模式同化结果,较真实的反应了海底实际底摩擦状况;采用干/湿处理模块,可以较好模拟近岸的潮汐潮流。通过沿岸19个验潮站M2分潮潮汐调和常数的实测值与计算值的对比,振幅平均误差为5.6 cm,位相平均误差为6.1(°),模拟值与实测值较为接近。表层潮流椭圆的分布,基本反映了渤海及黄海北部的潮流特征。

Based on the finite-volume ocean numerical model FVCOM,the tide and current of M2 sub-tide in Bohai and Yellow Sea is simulated numerically.It can fit well with the winding shoreline and improve the grid resolution in the coastal waters by using irregular triangle meshes for the model in the horizontal direction;take the numerical model assimilation result as the bottom friction,reflects the seabed friction condition more closely;simulate the tide and tidal current inshore well by using the wet/dry treatment technique.Through the comparison of the measured values with the calculated ones of the tidal harmonic constants of M2 sub-tide in 19 tide stations,the average error of amplitude is 5.6 cm,and that of phase is 6.1.The calculated co-amplitude and co-phase chart and the distribution of tidal current ellipse are basically consistent with those in the previous studies,on the whole reflects the tide and trend features in the Bohai Sea and the northern Yellow Sea.However,the vertical distribution of the tidal current ellipse presents a rather special situation,the quantity and direction of the maximum velocity vary complex with the depth.