Spatial Variability of the Flow and Turbulence Within a Model Canopy

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• 作者：Ian N. Harman ; Margi Böhm ; John J. Finnigan ; Dale Hughes
• 刊名：Boundary-Layer Meteorology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：160
• 期：3
• 页码：375-396
• 全文大小：1,009 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Meteorology and Climatology
  Atmospheric Protection, Air Quality Control and Air Pollution
  
• 出版者：Springer Netherlands
• ISSN：1573-1472
• 卷排序：160

文摘

The spatial variability of the mean flow and turbulence in and above a model canopy is investigated using three-dimensional laser Doppler velocimetry. The mean flow and turbulence are shown to be highly variable in space within the canopy but rapidly converge above the canopy. The coherent variations in the mean flow generate dispersive fluxes contributing almost a fifth to the total flux of momentum, and a greater contribution to the divergence of the flux, within the canopy. The higher-order turbulent statistics are more variable than the mean flow and often strongly correlated in space to variations in the mean flow. The implications of this microscale spatial variability for both field experiments and other laboratory experiments into canopy flow are discussed.KeywordsCanopy flowDispersiveSpatial variabilityTurbulenceWind tunnel