渤海典型余环流及其影响因素研究

以大阪大学海湾模型（ODEM），三维斜压水动力模型研究了渤海夏、冬季节典型余环流结构及其控制园子的影响．浅析了不同计算工况下余流结构对海域不同部分水交换能力的影响．通过分析渤海中部流速的垂向分布，探讨了潮汐、季风和表面热交换对杂环流的贡献．从表面和底层的潮余流结构可以看出渤海的余环流由多个而不是一个旋涡构成，海域的地形和海岸线形状是控制沿岸潮余流结构的主要因素．渤海典型风向下的夏季风和冬季风对余环流的影响差异较大；区域性热盐效应导致的密度流不管是否引起层化现象都会对凤生流和潮余流产生较大的影响．

Research on typical residual circulation and its driving factors in the Bohai Sea

The typical seasonal(summer and winter) residual circulation in the Bohai Sea is studied with the Osaka Dagaiku Estuary Model(ODEM),3 D baroclinic hydrodynamic model.The relationship between the structure of the residual circulation and the ability of the water exchange is presented under different computational cases.The corresponding mechanism and the interaction of tide,wind and heat exchange are also discussed based on the vertical distribution of residual current. From the structure of tidal residual current(surface and bottom) it can be seen that there are many vortexes rather than one big vortex in the Bohai Sea which constitute the tidal residual circulation system.The topography and the shape of the coastal line induce the coastal tidal residual circulation pattern.The effects of seasonal winds on tidal residual current are quite different in summer and winter.Local thermally driven current has great effects on the tide induced current and the wind driven current no matter whether they induce stratification or not.