南黄海辐射沙脊群西洋水道质点示踪数值模拟

Numerical simulation of water particle motion in Xiyang tidal inlet on radial sand ridges of south Yellow Sea

基于二维水动力数学模型和现有西洋垂线流速分布公式,运用Lagrange质点示踪法计算分析了南黄海辐射沙脊群北部西洋水域的质点运动轨迹,并与投放到该海域的GPS漂流浮标运动轨迹作比较,计算结果与实测浮标漂流轨迹吻合良好。模拟结果表明,西洋水域的涨潮表层流速最大可达3.5 m/s,落潮流速最大可达2.0 m/s,水质点运动主要沿着主槽方向,当质点运动到潮流沙脊区域,其运动会发生偏移,Lagrange余流方向指向南面。

Based on the 2D flow model and velocity distribution equation applied in Xiyang, the particle trajectory of Xiyang, located in the region of radial sand ridges in the south Yellow Sea, was obtained by using the Lagrange particle tracer method, which was consistent with the trajectory of a GPS buoy thrown into this area. The results show that the maximal surface velocities are 3.5 m/s and 2.0 m/s at the flood and ebb tide respectiveiy. The water particles move along the main channel primarily and shift in sand ridge zone, with the Lagrange residual current moving towards south.