Studies on Environmental Turbent Flows

CTS-9523249 费尔南多 这项工作将是一项实验室研究，辅以理论分析，研究对环境和气候预报有意义的湍流。 具体而言，拟议的工作涉及对了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）在背景分层和平均剪切的存在下，负浮力流体质量的下沉和B）在垂直速度梯度的存在下，在湍流混合层的底部夹带。 第一项研究已应用于强阵风和水平风切变的产生接近地面。 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式的混合参数化。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.