Modifications to the Mellor-Yamada-Nakanishi-Niino (MYNN) model for the stable stratification case
Modifications to the Mellor-Yamada-Nakanishi-Niino (MYNN) model for the stable stratification case
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DOI：
10.2151/jmsj.2010-506
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发表时间：
2010-10
影响因子：
3.1
通讯作者：
Y. Kitamura
中科院分区：
文献类型：
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作者：
Y. Kitamura
为了解决Mellor-Yamada-Nakanishi-Niino （MYNN）模型的问题，我们尝试按照Canuto等人（2008）针对稳定分层情况提出的方法对其进行修改。与原来的MYNN模型相比，改进后的模型没有临界Richardson数，并且在二级模型中，湍流运动的影响对所有Richardson数的值都保持不变。此外，改进后的模型即使对于2.5级和3级模型也具有优势。通量Richardson数是无界的，在原MYNN模型中必须施加湍流动能的下限；这些特征不会出现在修改后的模型中。
To solve the problems of the Mellor-Yamada-Nakanishi-Niino (MYNN) model, we attempted to modify it by following the method proposed by Canuto et al. (2008) for the stable stratification case. In contrast to the original MYNN model, the modified model has no critical Richardson number, and the effect of turbulent motions remains for all Richardson number values in the level 2 model. Furthermore, the modified model possesses an advantage even for the level 2.5 and level 3 models. The flux Richardson number is unbounded, and a lower limit of the turbulent kinetic energy must be imposed in the original MYNN model; these features do not appear in the modified model.