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首页> 外文期刊>Journal of the Atmospheric Sciences >Structure of the Atmospheric Boundary Layer in the Vicinity of a Developing Upslope Flow System: A Numerical Model Study
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Structure of the Atmospheric Boundary Layer in the Vicinity of a Developing Upslope Flow System: A Numerical Model Study

机译：发展中的上坡流系统附近大气边界层的结构：数值模型研究

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摘要

The development of a morning upslope flow is studied by means of idealized numerical simulations. In particular, two cases are examined: a plane slope connecting a lower plain and an elevated plateau and a symmetric mountain in the middle of a uniform plain. The analysis examines various steepness cases and aims at understanding the processes occurring in the area of transition between the upslope flow region and the convective boundary layers (CBLs) growing nearby. A characteristic sequence of events is recognized in the simulations, and their relationship with the along-slope variability of the thermal energy and turbulent kinetic energy budgets is studied. Features occurring after the onset of the upslope wind include a transient depression in the boundary layer depth at the base of the slope and the formation of elevated turbulent layers above the CBL, caused by the divergence of turbulent flow from a thermal plume at the slope top. Numerical evidence agrees well with the results of previous experiments, including both field campaigns and water tank models. It is observed that the occurrence of streamwise inhomogeneities in the upslope flow field favors the occurrence of a multilayered vertical structure of the CBL near heated slopes. Multiple layering appears to be a transient feature, only persisting until sufficient heating causes the merging of the CB L with the overlying elevated turbulent layers. The analysis suggests that the slope steepness is an important factor in determining the speed at which the boundary layer structure near a slope evolves in time: in particular, the development of the wind system appears to occur faster in the vicinity of a steeper slope.
机译：通过理想的数值模拟研究了早晨上坡流的发展。特别是，研究了两种情况：连接下平原和高原的平面坡度，以及均匀平原中间的对称山脉。该分析研究了各种陡峭情况，旨在了解在上坡流动区和附近生长的对流边界层（CBL）之间的过渡区域中发生的过程。在模拟中识别出事件的特征序列，并研究了它们与热能和湍动能预算沿坡度变化的关系。上坡风开始后出现的特征包括斜坡底部边界层深度的短暂凹陷和CBL上方高位湍流层的形成，这是由于坡顶顶部的热羽流产生的湍流发散所致。 。数值证据与先前实验的结果非常吻合，包括野战和水箱模型。可以看出，在上坡流场中沿流向的不均匀性的出现有利于在加热的坡度附近出现CBL的多层垂直结构。多层似乎是一个短暂的特征，仅持续到足够的加热导致CB L与上覆的湍流层合并为止。分析表明，斜坡陡度是确定斜坡附近边界层结构随时间变化的速度的重要因素：特别是，在陡峭的斜坡附近，风力系统的发展似乎更快。

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