Cartographie de la vulnérabilité multifactorielle à l'érosion hydrique des sols de la région de Bonoua (Sud-Est de la Côte d'Ivoire)

Abstract

Water soils erosion has not been studied enough in the region of Bonoua south-eastern Côte d'Ivoire where major economic activity remains the agriculture. Consequently, control methods are necessary in order to ensure sustainable management of soils and to secure agricultural productions. The objective of this study is to supply tools for mapping multifactorial vulnerability to water soil erosion. The method involves an analysis of the main factors of erosion: rainfall erosivity, soil erodibility, slope and land use. Obtained maps are integrated in Geographic Information System (GIS) throughout an additive combinaison to establish a vulnerability water soils erosion map. This map is validated after ground observations. Three classes of multifactorial vulnerability to water erosion have been distinguished: areas with low vulnerability (29 per cent); areas with middle vulnerability (34 per cent) and areas with high vulnerability (37 per cent). Thus, in the region of Bonoua, classes with a middle or high multifactorial vulnerability represent 71 per cent of the study area. This first map is a tool that would help decision makers in attribution of areas for agricultural activities and for socio-economic substructures.

Keywords

• GIS
• Côte d'Ivoire
• water erosion
• multifactorial vulnerability