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Ben Slimane A., Raclot Damien, Evrard O., Sanaa M., Lefevre I., Le Bissonnais Y. (2016). Relative contribution of rill/interrill and gully/channel erosion to small reservoir siltation in mediterranean environments [plus Supporting information]. Land Degradation and Development, 27 (3), 785–797. ISSN 1099-145X

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Titre
Relative contribution of rill/interrill and gully/channel erosion to small reservoir siltation in mediterranean environments [plus Supporting information]
Année de publication2016
Type de documentArticle référencé dans le Web of Science WOS:000373949600030
AuteursBen Slimane A., Raclot Damien, Evrard O., Sanaa M., Lefevre I., Le Bissonnais Y.
SourceLand Degradation and Development, 2016, 27 (3), p. 785–797. p. 785–797 ISSN 1099-145X
RésuméReservoir siltation because of water erosion is an important environmental issue in Mediterranean countries where storage of clear surface water is crucial for their economic and agricultural development. The high density of gully systems observed in Mediterranean regions raises the question of their contribution to reservoir siltation. In this context, this study quantified the absolute and relative contributions of rill/interrill and gully/channel erosion in sediment accumulation at the outlet of small Tunisian catchments (0·1-10 km2) during the last 15 years (1995-2010). To this end, a fingerprinting method based on measurements of caesium-137 and total organic carbon combined with long-term field monitoring of catchment sediment yield was applied to five catchments in order to cover the diversity of environmental conditions found along the Tunisian Ridge and in the Cape Bon region. Results showed the very large variability of erosion processes among the selected catchments, with rill/interrill erosion contributions to sediment accumulated in outlet reservoirs ranging from 20 to 80%. Overall, rill/interrill erosion was the dominant process controlling reservoir siltation in three catchments whereas gully/channel erosion dominated in the other two catchments. We identified the presence of marly gypsum substrates and the proportion of catchment surface covered by soil management/conservation measures as the main drivers of erosion process variability at the catchment scale. These results provided a sound basis to propose guidelines for erosion mitigation in these Mediterranean environments and suggested to apply models simulating both rill/interrill and gully/channel erosion in catchments of the region.
Plan de classementHydrologie [062] ; Pédologie [068]
LocalisationFonds IRD [F B010066399]
Identifiant IRDfdi:010066399
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010066399

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