TXT-tool 1.084-3.1 Landslide susceptibility mapping at a regional scale in vietnam

Abstract

This tool deals with a procedure for landslide susceptibility mapping at a regional scale. It is applied to the upper Lo River catchment in Vietnam, where data on spatial distribution of historic landslides and environmental factors are available, although they are limited. The available data include an inventory map and six landslide factor maps related to elevation, slope gradient, drainage density, fault density, types of weathering crust, and types of land cover. The Analytical Hierarchy Process method is used together with expert knowledge to define the weights of each factor and each factor class in order to determine the relative importance of the six landslide factors and their classes within the landslide susceptibility analysis. The Weighted Linear Combination method is used to assign the above-defined weights to all factor maps in raster format in order to compute the landslide susceptibility. As the approach is able to integrate expert knowledge in the weighting of the input factors, the actual study shows that the combination of Analytical Hierarchy Process and Weighted Linear Combination methods is suitable for landslide susceptibility mapping in large mountainous areas at medium scales, particularly for areas lacking detailed input data.