Frequent Weak-wind Boundary Layers Using New Analysis Techniques in the Space-time Domain

使用时空域新分析技术的频繁弱风边界层

• 批准号: 1614345
• 负责人: Larry Mahrt
• 金额: $ 60.31万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-10-01 至 2020-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1614345&HistoricalAwards=false
• 关键词: Frequent; Weak; wind; Boundary; Layers

This study seeks to improve our understanding of the interaction of weak wind flow in the lowest layer of the atmosphere and generation of turbulence in gently sloping terrain. An improved understanding of weak-wind boundary layers could potentially lead to more accurate modeling of the formation of cold pools, damaging frost (including impact to local vineyards), fog formation, and dispersion of contaminants. This study seeks to investigate weak-wind boundary layers using detailed spatial-temporal measurements. These boundary layers demonstrate non-stationarity and the turbulence in them is generally in a non-equilibrium state with the mean flow. Previous studies of such boundary layers were mostly limited to temporal data at fixed locations, and therefore could not take into account hysteresis when investigating scaling properties. This study analyzes detailed spatial-temporal data to form a more complete picture of boundary layer structures. The evolution of the structures and the impact of the sub-mesoscale motions will be investigated.

本研究旨在提高我们对大气最低层弱气流与缓坡地形湍流生成相互作用的理解。 对弱风边界层的更好理解可能会导致对冷池形成、破坏性霜冻（包括对当地葡萄园的影响）、雾的形成和污染物的扩散进行更准确的建模。本研究旨在调查弱风边界层使用详细的时空测量。这些边界层表现出非定常性，其中的湍流通常与平均流处于非平衡状态。以前的研究，这种边界层大多局限于固定位置的时间数据，因此不能考虑滞后时，调查的标度特性。这项研究分析了详细的时空数据，形成一个更完整的图片边界层结构。将研究结构的演变和次中尺度运动的影响。