Landslide susceptibility assessment by implementing the analytical hierarchy process in GIS weight overlay tool: A case study of the Krupanj area in Western Serbia

Abstract

The aim of this work is to show the susceptibility to sliding in the Krupanj area. Intense rainfall in May 2014 triggered many landslides in western Serbia. The Krupanj area was particularly affected by this event. The material damage occurred affected the awareness of the importance of knowing the locations that are prone to sliding. Therefore, from 2014 to 2021, field research was carried out in the Krupanj area. During this period a large amount of landslide data was collected by engineering geological mapping. These data were used for susceptibility analysis. For present study was used analytical hierarchy process (AHP) and weighted overlay (WO) method. Nine factors were used for susceptibility analysis: slope, aspect, curvature, elevation, lithology, distance from rivers, faults, boundary’s and land cover. In order to be able to compare all factors were first standardized and then evaluated using Saaty scale. The weights of each factor were obtained. The weight values obtained by AHP were used for WO model. Both map was validated by ROC graph. The validation results show 68.6% (satisfactory) and 77.2% (good) for AHP and WO models. We can conclude that AHP map is more detailed but less reliable compared to WO map.