Regional landslide zonation based on entropy method in Three Gorges area, China

Abstract

With the development and expansion of landslide research, quantitatively conducting regional landslide hazard assessment is demonstrated to be an effective method in assessing regional scale landslide hazard. This study sets up an index system for regional landslide hazard zonation by means of intensity factors and probability factors of landslide occurrence. Based on the information entropy method, subjective weight was calculated for landslides in Wanzhou County, located in the Three Gorges Reservoir area, and a qualitative landslide hazard degree zonation model was established. This model was then used in evaluating the hazard degree of the landslides in Wanzhou County, and the results were contrasted and confirmed through field investigation and density analysis. As a result, this model demonstrates a useful application of a new methodology and provides a basis for future warning and hazard evaluations of a regional scale landslide.