悬对沙Mellor-Yamada海洋边界层模型计算结果的影响

Influence of suspended sand on calculation of Mellor-Yamada ocean boundary layer model

为了分析海洋水体垂向水流紊动及紊动交换情况而采用了一维的海洋边界层模型(Mellor -Yamada)并利用数值实验的方法对悬沙、盐度、温度等数据进行分析。原模型未将悬沙考虑在内 ,本文试将它引入进去探讨由于它的存在对紊动混合特性的影响。2000年4月 ,Mellor将最初的模型引入了依赖于Richardson数的紊动动能耗散率。本文通过比较具有悬沙和不具有悬沙两种情况下的速度、温度和盐度垂向分布随时间的变化 ,分析讨论由于悬沙的存在所引发的密度层化对紊动混合作用的影响 。

In this paper, an one dimensional ocean boundary model is used in order to analyze the vertical turbulence exchanges of suspended sediment, salinity, temperature by numerical experiment. The original model did not account for the suspended sediment, so the author tries to introduce it into the model in order to analyze the effect of suspended sediment in this paper. In April,2000, Mellor revised the original model by introducing the turbulence dissipation dependent on Richardon Number. The aim for introducing suspended sediment into the model is to analyze its effect on the turbulence mixing. In the comparison of the distributions for salinity, temperature and current speed with suspended sediment with those without suspended sediment, we find that the suspended sediment restrains the turbulence mixing.