【摘要】 渤海为极浅陆架海 ,其中湍流耗散作用显著。将三维斜压陆架海模式 HAMSOM应用于渤海 ,以渤海周边台站每天 4次的常规气象资料作为风和热驱动 ,渤海海峡开边界以 5个主要分潮调和常数计算水位强迫 ,计算了渤海 1982年水文要素和流场变化 ,并用模式以湍的局地平衡理论封闭计算出垂直湍流粘性的时空分布。结果表明 :渤海湍流混合冬强夏弱 ,变化幅度较大 ( 10～ 2 0 0 cm2 / s) ,这是风搅拌和潮混合的湍流输入在密度层化调整下的结果 ;风的作用在冬季强于潮的作用 ,而底层则由潮混合控制呈现半月周期 ;渤海湍粘性系数的空间分布十分复杂 ,这是在渤海地形和岸形轮廓限制下 ,由一定大气条件驱动的流场和密度场导致的湍流混合强度不同所致更多还原

【Abstract】 The intensity of turbulence is measured by the vertical eddy viscosity ( A v ) in the ocean. It is necessary for us to discuss its spatial and temporal distribution, because it influences not only the structure of the current but also the calculated tidal elevation. It has also been shown that it is of importance to the complex system of physical and biological processes, especially to the distribution of the biomass of plankton. The role of the vertical eddy viscosity is more significant in the Bohai Sea due to its small depth. Based on a three dimensional coastal shelf sea modelHAMSOM, the current field and other variables are obtained in 1982. The model is driven by wind and heat flux every 6 hours per day, and five tidal components are imported through the open boundary. The vertical eddy viscosity is calculated at the same time based on the hypotheses of local turbulent equilibrium. The spatial and temporal distribution of the vertical eddy viscosity is related to the processes of warming, cooling, wind mixing and tidal mixing. The grid space is 1/12 degree and the time step is 360s.更多还原