SUSCEPTIBILITY ASSESSMENT OF LANDSLIDE AFTER RESERVOIR IMPOUNDMENT BASED ON ANALYTIC HIERARCHY PROCESS

Reservoir areas are prone to secondary geological disasters such as landslides and collapses due to complex geological conditions involving topography and water level, which seriously threatens the safety of reservoirs and nearby residents. Taking a certain impoundment reservoir as the research object, 9 sliding factors including landform, stratum lithology, slope gradient, aspect, density and area of geohazard sites, precipitation, water storage variation and earthquake intensity are selected to construct the evaluation matrix and landslide risk calculation method on the basis of adequate data collection of topographic and hydrological conditions through analytic hierarchy process(AHP). Four landslide risk grades are divided according to the evaluation results, which then generate the potential landslide risk zoning map of the reservoir area by MapGIS. The zonation coincides highly with the distribution of landslide bodies interpreted by remote sensing, which proves that the evaluation model is effective.