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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 5
Ann. Geophys., 27, 1843–1859, 2009
https://doi.org/10.5194/angeo-27-1843-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 1843–1859, 2009
https://doi.org/10.5194/angeo-27-1843-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 May 2009

04 May 2009

Profile of the horizontal wind variance near the ground in near neutral flow – K-theory and the transport of the turbulent kinetic energy

S. Yahaya1,* and J. P. Frangi1 S. Yahaya and J. P. Frangi
  • 1Equipe Géomatériaux & Environnement, Institut de Physique du Globe de Paris/Université Paris 7 – Denis Diderot, UMR 7154, case postale 89, 4 place Jussieu 75252 Paris cedex 05, France
  • *current address: National Centre of Solar Energy (CNES), BP 621, Niamey, Niger

Abstract. 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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