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Non-stationary Boundary Layers
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2020-06-15 , DOI: 10.1007/s10546-020-00533-w
L. Mahrt , Elie Bou-Zeid

The literature includes a wide variety of definitions or perceptions of non-stationarity. Non-stationarity can be expressed in terms of turbulence statistics or variability of the forcing of the turbulence such as time changes of the wind vector, the horizontal pressure gradient, or the surface heat flux. Our survey emphasizes the development of non-equilibrium turbulence caused by non-stationary forcing. The degree of non-equilibrium of the turbulence is most reliably evaluated following the local flow rather than using the more available fixed-point measurements. We survey methods to eliminate non-stationary records or partially filter out the non-stationarity. We also summarize issues with parametrization of the non-stationarity. Non-stationarity over the sea can be complex due to time-dependent wave state and surface roughness. The impact of non-stationarity is generally less understood in the stable boundary layer compared to the unstable boundary layer.

中文翻译:

非平稳边界层

文献包括对非平稳性的各种定义或看法。非平稳性可以用湍流统计或湍流强迫的可变性来表达,例如风矢量、水平压力梯度或表面热通量的时间变化。我们的调查强调了由非平稳强迫引起的非平衡湍流的发展。遵循局部流动而不是使用更可用的定点测量最可靠地评估湍流的非平衡程度。我们调查了消除非平稳记录或部分过滤非平稳性的方法。我们还总结了非平稳性参数化的问题。由于时间相关的波浪状态和表面粗糙度,海上的非平稳性可能很复杂。
更新日期:2020-06-15
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