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| Titel |
Profile of the horizontal wind variance near the ground in near neutral flow – K-theory and the transport of the turbulent kinetic energy |
| VerfasserIn |
S. Yahaya, J. P. Frangi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 5 ; Nr. 27, no. 5 (2009-05-04), S.1843-1859 |
| Datensatznummer |
250016504
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1843-2009.pdf |
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| Zusammenfassung |
| This paper deals with the characteristics of the atmospheric
turbulent flow in the vicinity of the ground, and particularly with
the profile of the horizontal wind variance. The study is based on
experimental measurements performed with fast cup anemometers
located near the ground at 5 different levels (from 0.25 to 4 m)
and sampled at 1 Hz. The experiment was carried over two
agricultural plots with various tillage treatments in a fallow
semiarid area (Central Aragon, Spain). The results of this study
reveal that near the ground surface and under moderate wind, the
horizontal wind variance logarithmically increases with height, in
direct relationship with the friction velocity and the roughness
length scale. A theoretical development has allowed us to link this
behaviour to the modeling of the turbulent kinetic energy (TKE)
transport through the eddy diffusivity. Thus, the study proposes a formulation of the
similarity universal function of the horizontal wind variance. Besides, the formulation offers a new
method for the determination of the friction velocity and the
roughness length scale and can be used for the evaluation of the TKE
transport rate. |
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