Évaluation et cartographie de la susceptibilité aux glissements de terrain : Application à la région Nord de BBA

Abstract

Landslide susceptibility mapping is important for disaster management in mountainous and semi-mountainous regions. It is based on the creation of models from database consisting mainly of a landslide inventory map and taking into account the main conditioning factors that affect the occurrence of these landslides. In this study, a model based on the application of an expert approach is constructed to show the landslide susceptibility in the northern part of Bordj Bou Arreridj City, Algeria. A landslide inventory map was created using historical data, especially reports from previous studies established by the Laboratory of Public Works in the East (LTPE). More than 90 landslides were located by LTPE in the region, of which 18 are recognized in our study area. A field visit was conducted to verify the locations of the 18 landslides and update our database. During this visit, 10 landslides are recognized. These landslides are reserved for validation purpose. The landslide predisposing factors considered in the study area are: Aspect, elevation, lithology, precipitation, proximity from roads, and slope gradient. The relationships between the spatial distribution of landslides and these factors are evaluated in a GIS environment, using the hierarchical multi-criteria analysis (AHP) method. The results obtained are assessed and then validated.