Moving Beyond Monin–Obukhov Similarity Theory in Modelling Wind-Speed Profiles in the Lower Atmospheric Boundary Layer under Stable Stratification
Moving Beyond Monin–Obukhov Similarity Theory in Modelling Wind-Speed Profiles in the Lower Atmospheric Boundary Layer under Stable Stratification
复制标题
超越莫宁-奥布霍夫相似理论模拟稳定层结下低层大气边界层的风速剖面
DOI：
10.1007/s10546-014-9953-z
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发表时间：
2014
影响因子：
4.3
通讯作者：
F. Bosveld
中科院分区：
文献类型：
--
作者：
M. Optis;A. Monahan;F. Bosveld
Monin-Obukhov相似理论（MOST）通常用于模拟与风力发电有关的高度（例如10-200米）的风速分布。虽然这种方法对于不稳定到弱稳定的层结相当准确，但在越来越稳定的层结下变得不太准确，这主要是由于MOST假设的恒定通量表层变得比感兴趣的高度范围更浅。此外，在表层以上，科里奥利力对风速廓线有相当大的影响（特别是在低空急流的形成方面），这是不能用相似理论模拟的。我们的目标是比较替代外推模型的准确性，这些模型在物理上更适合于表层以上。使用2007年7月至2008年6月期间来自荷兰213米Cabauw气象塔的数据，表明MOST仅在低海拔和低稳定性下准确，并在高海拔和高稳定性下发生故障。在所有高度和稳定度上，局部相似性通常比MOST更准确，尽管模型需要多个高度的湍流通量数据，这通常是不切实际的。相比之下，一个两层MOST-埃克曼模型被认为是可比的其他模型在低稳定性范围内，并在高稳定性范围内相当准确，而只需要一个措施的表面稳定性和地转风。
Monin–Obukhov similarity theory (MOST) is commonly used to model the wind-speed profile at altitudes relevant to wind-power production (e.g. 10–200 m). Though reasonably accurate for unstable to weakly stable stratification, this approach becomes less accurate under increasingly stable stratification, largely due to the constant-flux surface layer assumed by MOST becoming shallower than the altitude range of interest. Furthermore, above the surface layer, the Coriolis force has a considerable influence on the wind-speed profile (in particular in the formation of low-level jets) that cannot be modelled using similarity theory. Our goal is to compare the accuracy of alternative extrapolation models that are more physically appropriate above the surface layer. Using data from the 213-m Cabauw meteorological tower in the Netherlands between July 2007 and June 2008, it is shown that MOST is accurate only at low altitudes and low stability, and breaks down at high altitudes and high stability. Local similarity is generally more accurate than MOST across all altitudes and stabilities, though the model requires turbulent flux data at multiple altitudes that is generally impractical. In contrast, a two-layer MOST–Ekman model is found to be comparable to the other models at low stability ranges and considerably more accurate in the high stability range, while requiring only a measure of surface stability and the geostrophic wind.