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Structure of stable stratified boundary layers: study with of nonlocal turbulence model

机译：稳定分层边界层的结构：非函数湍流模型研究

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摘要

Two types of vertical structure of turbulence are identified in the atmospheric boundary layer. One is the "traditional" boundary layer, in which turbulence is generated near the surface and is transported upward, in contrast to the second type, where turbulence is transported downward to the surface from a source aloft in the boundary layer. The latter can be called as the "upside-down boundary layer". In this case, the turbulence can be transferred downward to the surface, e.g., as random process. In this study, the boundary layer is upside down if turbulence increases with height and the transport of turbulence energy is downward toward the surface. Presumably, a similar structure can develop within the flow of air over a surface with large-scale roughness (city), when the horizontal temperature gradient between the heated air above the city and the air on the adjacent colder surface of the environment generates turbulent thermal circulation. If this turbulence generation is substantially larger than the generation of turbulence due to surface processes (wind shear), then the vertical transport of turbulence is downward toward the surface. In the present study, the vertical profiles of wind speed, temperature and turbulent quantities in the nocturnal urban boundary layer, calculated by means of the improved mesoscale model, are analyzed to understand the vertical structure of this layer.
机译：在大气边界层中识别出两种类型的湍流结构。一个是“传统”边界层，其中湍流在表面附近产生并且与第二种类型相比，向上运输，其中湍流从边界层中从源极轿厢向下传送到表面。后者可以称为“颠倒边界层”。在这种情况下，湍流可以向下传递到表面，例如随机过程。在这项研究中，如果湍流随高度增加并且湍流能量的传输向下朝向表面向下增加，边界层倒置。据推测，当城市上方的加热空气和环境上的较冷表面上的空气之间的水平温度梯度产生湍流热量时，类似的结构可以在具有大规模粗糙度（城市）的空气中的流动。循环。如果这种湍流产生基本上大于由于表面处理（风剪切）引起的湍流的产生，则湍流的垂直传输向下朝向表面向下。在本研究中，通过改进的Messcale模型计算的夜间城市边界层中风速，温度和湍流量的垂直简档，以了解该层的垂直结构。

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