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Slope and rainfall effects on the volume of sediment yield by gully erosion in the Souar lithologic formation (Tunisia)

Auteur(s) et Affiliation(s)

BOUCHNAK, H.
Ecole Nationale d'Ingénieurs de Tunis (ENIT), Lab. Télédétection et Système d'Information à Référence Spatiale (LTSIRS), Tunis-Belvédère, Tunisie
Ecole Nationale d'Ingénieurs de Tunis (ENIT), Lab. Télédétection et Système d'Information à Référence Spatiale (LTSIRS), Tunis-Belvédère, Tunisie
Ecole Nationale d'Ingénieurs de Tunis (ENIT), Lab. Télédétection et Système d'Information à Référence Spatiale (LTSIRS), Tunis-Belvédère, Tunisie


Description :
The Souar lithologic formation in semi-arid Tunisia is undergoing severe gully erosion which is threatening soil and water resources. Soil conservation strategies have focused more on terracing than on gully control techniques. This paper reports investigations into the sediment yield provided by head-cut as well as sidewall-floor erosion of first order gullies on gentle and steep slope catchments underlined by the Souar lithologic formation. Two equations between the length of the gully head cutting and the corresponding volume of evacuated sediment were established. The aims of the research reported here are : to combine gully field measurements with gully data extracted from air photographs to quantify on a medium time span (48 years) gully sediment yield; to distinguish between the relative contribution of gully head cutting and subsequent sidewalls-floor erosion in total sediment yield; to establish relationships between rainfall and gully head-cut sediment yield.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2009, vol. 78, n°. 2, p. 170-177, nombre de pages : 8, Références bibliographiques : 27 ref.

Date :
2009

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

Langue :
Anglais
Droits :
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