Studies on Environmental Turbent Flows

这项工作将是一项实验室研究，在理论分析的基础上，对环境和气候预测有兴趣的湍流进行研究。具体来说，拟议的工作涉及对理解海洋和大气中的小尺度现象至关重要的两个过程。确定的研究过程是：a)在背景分层和平均切变存在的情况下，负浮力流体团下沉；b)在垂直速度梯度存在的情况下，湍流混合层底部的夹带。第一项研究应用于强阵风和接近地面的水平风切变的产生。更好地了解这些现象对航空安全至关重要。第二项研究旨在改进混合层模型的混合参数化。这些模型用于短期预测。

CTS-9523249 Fernando This work will be a laboratory study, augmented by theoretical analysis, of turbulent flows that are of interest to environmental and climatic forecasting. Specifically the proposed work addresses two processes that are vital for the understanding of small-scale phenomena in oceans and the atmosphere. The processes identified for study are: a) the sinking of negatively buoyant fluid masses in the presence of background stratification and mean shear and b) the entrainment at the base of a turbulent mixing layer in the presence of vertical velocity gradients. The first study has application to the generation of strong gusts and horizontal wind shears close to the ground. A better understanding of these phenomena is paramount to aviation safety. The second study is aimed at improving the mixing parameterizations of mixed layer models. These models are in use for short term forecasting.