Hazard Mapping of Rainfall-induced Shallow Landslide in Phetchabun, Thailand

Abstract

 In order to manage landslide hazard and mitigate subsequent damages, it is important to predict a occurrence of rainfall-induced shallow landslides on a regional scale, especially in developing countries which often face difficulties to make predictions due to relative scarcities of landslide-related data. This paper used a physically-based stability model to analyze one landslide event in 2001 induced by a extreme rainfall in Phetchabun province, Thailand. This paper outlined the main features of the slope stability model. Consequently the model on the extreme rainfall event in 2001 predicted the shallow landslide hazard as follows. 1) The western side of the study area displayed the lowest factor of safety. 2) The predicted unstable grids included 70% of the observed landslides when the threshold of factor of safety was 1.00. 3) The predicted factor of safety showed a good correlation with the location of the observed landslides by using the literature-based parameters in the slope stability model. These results of the hazard map showed a certain potential as a landslides forecasting tool on a regional scale.