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Modeling wind erosion flux and its seasonality from a cultivated sahelian surface : A case study in Niger

Auteur(s) et Affiliation(s)

PIERRE, C.
Géosciences Environment Toulouse (GET), UMR 5563, IRD, Univ. Toulouse, UPS (OMP), CNRS, Toulouse, France
Lab. Interuniversitaire des Systèmes Atmosphériques, LISA, Créteil, France
Lab. Interuniversitaire des Systèmes Atmosphériques, LISA, Créteil, France
Univ. Abdou Moumouni, Jeune Equipe Associée à l'IRD, Anthropisation et dynamique Eolienne (JEAI ADE), Dept. de Géologie, Niamey, Niger
RAJOT, J.-L.
IRD Bioemco, UMR IRD/UPMC/CNRS/UNS/UPEC/AgroParisTech, Bondy, France
KERGOAT, L.
Géosciences Environment Toulouse (GET), UMR 5563, IRD, Univ. Toulouse, UPS (OMP), CNRS, Toulouse, France


Description :
A wind erosion model is tested in this study to check the capacity to reproduce observations collected over a millet field and a neighboring bare plot in southwestern Niger during a three-year period. Observations of sediment horizontal fluxes and of vegetation growth and decay show that most of the eroded mass is due to major events occurring at the end of the dry season and at the beginning of the rainy season for the millet field, while erosion also occurs during the dry season for the bare soil plot. Horizontal erosion fluxes were computed with and without obstacles and compared to the measurements. Simulations were found in a good agreement with erosion measurements for both bare and millet plots, in terms of temporal dynamics, reproduction of the major events and annual quantities. Modeling is therefore able to represent anthropogenic impacts on wind erosion over typical Sahelian surfaces.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, n°. 122, p. 61-71, nombre de pages : 11, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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