Horizontal and vertical distribution of wind speed in a vegetation canopy
| Autor: | J.H. van Boxel, Adrie F. G. Jacobs |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1991 |
| Předmět: |
Meteorologie en Luchtkwaliteit
Wind gradient Meteorology and Air Quality plants meteorological factors turbulence planten turbulentie Wind direction Atmospheric sciences Agricultural and Biological Sciences (miscellaneous) Standard deviation Wind speed Wind profile power law microklimaat Log wind profile meteorologische factoren Wind shear Environmental science wind grenzen Shear velocity boundaries microclimate |
| Zdroj: | Netherlands Journal of Agricultural Science 39 (1991) Netherlands Journal of Agricultural Science, 39, 165-178 |
| ISSN: | 0028-2928 |
| DOI: | 10.18174/njas.v39i3.16539 |
| Popis: | Wind speed measurements within a maize row canopy were carried out to investigate the horizontal and vertical variability of the mean wind speed and its standard deviation. Attention was given to finding adequate scaling parameters of the within-canopy wind speed profiles under various atmospheric stratification states. A validation of existing model simulations was also carried out. The horizontal mean wind speed and its standard deviation can vary about 20% from its spatial mean value. During day time and night time the friction velocity appears to be a good scaling parameter. Clear nights, however, are exceptions, when the wind speed above the crop drops to a very low value. Then the free convection velocity appears to be an appropriate scaling parameter for the within-canopy processes. The canopy models of Wilson & Shaw [Journal of Applied Meteorology (1977) 16, 1197-1205] and Li et al. [Boundary-Layer Meteorology (1985) 33, 77-84] were found to simulate the spatially averaged mean wind profile within the range of the horizontal variability. (Abstract retrieved from CAB Abstracts by CABI’s permission) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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