胶州湾三维潮流及潮致余环流的数值模拟

THE SIMULATION OF 3D TIDAL AND RESIDUAL CURRENT IN THE JIAOZHOU BAY

运用一个三维正压湍流封闭数值模式 ,成功模拟了胶州湾 M2 分潮的潮汐与潮流分布。模拟结果表明 ,胶州湾的潮流以往复流为特征 ,最大流速出现在胶州湾口 ,量值为 95cm/s。潮致余流的水平结构是“团团转”的多涡结构 ,其中 5个余流涡旋的位置得到观测资料的证实。在模拟结果的基础上 ,比较了欧拉余流和拉氏余流的差异 ,并分析潮致拉氏余流涡的垂向结构特征。垂向湍粘性系数的水平分布与水深分布形态相似 ,呈现出底、表层小、中层大的垂直分布结构。

A three dimension barotropic model, included the Mellor Yamada turbulent closure scheme, was applied to simulate M 2 tide, tidal and residual current in the Jiaozhou Bay. The tide simulation was verified. The model results show that the character of tidal current in Jiaozhou Bay is go back flow and the maximum current, 95 cm/s, is located at the mouth of Jiaozhou Bay. The multi cycles are showed in the horizontal residual current pattern. Five cycle locations had been verified by current observations. On a basis of model result, the differences between Eular and Lagrange residual current were compared and the vertical structures of Lagrange residual current were analyzed. The horizontal pattern of the vertical eddy viscosity is similar with depth distribution in Jiaozhou Bay. The vertical structure of the vertical eddy viscosity is showed that the values in the middle level are larger than these in the surface and bottom level.