Accéder directement au contenu Accéder directement à la navigation
Communication dans un congrès

Gully erosion prediction in a Sahelian context

Abstract : In Sahelian region, concentrated overland flow often leads to the formation of gullies. Although this phenomenon is widespread in those regions, research efforts are still needed to be able to model their spatial distribution and the role of the different parameters involved in this process. In this context, the objectives of this study are twofold. The first step is to investigate to what extent the role of Sahelian soil surface crusts (biological and/or physical) on soil surface infiltrability and detachment affect the formation and development of gullies. The second step is to integrate the results of these investigations in a simple geomorphological model to predict gully location at the watershed scale. The evaluation of the resulting model on two test catchments demonstrated that the integration of soil crusting is a key parameter to insure the quality and relevance of gully prediction. The model is able to distinguish between two types of gullies, those whose width range between 0.5m and 4m and those whose width exceeds 4m. The application of the model at the regional scale is however limited by the resolution of available regional digital elevation model (i.e. the 90m resolution SRTM DEM) which only permits the prediction of large gullies.
Type de document :
Communication dans un congrès
Liste complète des métadonnées

https://hal-brgm.archives-ouvertes.fr/hal-00660122
Contributeur : Aurore Gay <>
Soumis le : lundi 16 janvier 2012 - 09:15:52
Dernière modification le : jeudi 19 novembre 2020 - 15:54:29
Archivage à long terme le : : mardi 13 décembre 2016 - 23:01:45

Fichier

Gully_EUROSOIL_2012.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-00660122, version 1
  • PRODINRA : 244740

Citation

Aurore Gay, Olivier Cerdan, Jean-François Desprats, Oumarou Malam Issa, Christian Valentin, et al.. Gully erosion prediction in a Sahelian context. 4th International Congress EUROSOIL 2012, Jul 2012, Bari, Italy. ⟨hal-00660122⟩

Partager

Métriques

Consultations de la notice

763

Téléchargements de fichiers

142