Essai de modélisation des terrains susceptibles à l’érosion dans la région Sud de Bordj Bou Arreridj.

Abstract

Algeria is one of the most erodible countries in the world. The main objective of this study is to study the application of the frequency ratio model (FR), based on probabilities in mapping the susceptibility to gully erosion, using the geographic information system. Gully erosion is triggered by a combination of factors including slope, slope exposure, lithology, vegetation cover and hydrological conditions. Since the study area does not have any inventory and forecast maps of gully erosion, seven factors related to gully erosion were collected, the inventory was produced based on field research (GPS) and satellite images to produce a gully erosion susceptibility map of the study area. A total of 354 forms of erosion were mapped and randomly subdivided into a training set (70%) and a test set (30%) for validation purpose. The result shows that the proximity to roads, river and the slope exposure are the most important factors causing gully erosion. These results could be useful for land-use planning and decision-makers for the managing and controlling of current and future gully erosion, as well as for the protection of society and the ecosystem.