COHERENS模型在东京湾动力过程模拟中的应用

Application of COHERENS Model in Numerical Simulation of Tokyo Bay

水动力过程和温盐变化的准确模拟是研究生态过程的重要基础。COHERENS是一个模拟海洋动力过程的通用模型,可以用于模拟中尺度海域的水动力、温盐变化等过程。将COHERENS模型应用于东京湾,对湾内一年间实际的水动力过程、温盐过程进行了模拟,并与实测数据进行对比分析。计算结果与观测值吻合良好,较好地模拟了跃层的消长等季节变动,再现了温盐的年间变化过程,以及湾内典型季节的余流特征。结果表明,东京湾余流在冬、夏两季均会形成以上层流出、下层流入为特征的垂向流动结构。进一步通过对不考虑风应力的假设工况进行计算,可以看到风对余流结构有着较为重要的影响,较为持续的风应力作用会强化湾内的环状流动形态。

The accurate numerical simulation of hydrodynamic processes and the variation of temperature and salinity in coastal waters is of signifi- cance in the research of biological processes in marine ecosystem. COHERENS is a widely used hydrodynamic model in the research for regional and shelf seas. In this study,COHERENS is applied to simulate the current, temperature and salinity in Tokyo Bay during a period of one year. The calculated results are compared to observed in-situ data, and good agreement is found. The predicted water temperature and salinity are shown to reproduce the real variation throughout the year,and some typical processes, such as the formation of seasonal thermocline, are also shown in the results. The characteristics of seasonal residual current are also modeled for both winter and summer. From the residual current pattern ob- tained, the vertical circulation in the bay is known, which shows water flows out of the bay in the upper layers while flows into the bay in the lower layers. Further,the influence of wind on the residual current is discussed,which shows that the prevailed wind will strengthen the circulation pattern inside the bay.