It is shown that the ratio of standard deviation of lateral velocity to the friction velocity, o;/u,, and therefore wind direction fluctuations, are sensitive to mesoscale terrain properties. Under neutral conditions, a,/~, is almost 40% larger in rolling terrain than over a horizontal surface. In
The horizontal distribution of space correlation coefficients of wind fluctuations in the atmospheric surface layer
β Scribed by Taiichi Hayashi
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 752 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0006-8314
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β¦ Synopsis
The horizontal distribution of space correlation coefficients of wind fluctuations was investigated in the atmospheric surface layer. The observational network of wind sensors was arranged to form a two-dimensional extension in the horizontal plane. The shape of the distribution of the correlation coefficients was approximated by a group of concentric ellipses; streamwise and lateral integral scales were estimated as 75 m and 25 m, respectively. Taylor's frozen eddy hypothesis was tested using streamwise and time integral scales.
π SIMILAR VOLUMES
Height dependency of statistics of horizontal and vertical wind direction fluctuations over plant canopies have been studied, using observational data in the surface layer over paddy fields. Vertical wind directions just above plant canopies have significant positive average values and large standar