Hydrological-Geotechnical Model to Assess the Extreme Rainfall-Induced Shallow Landslides

Abstract

 A physically based model for assessment of shallow landslides triggered by heavy rainfall was analysed, applied, and validated to a case in the Khao Phnom, Krabi, Thailand. This model is based on the coupling of the hydrological model with an infinite slope stability model. Modified Green-Ampt model and steady groundwater flow model were used in the hydrological model. The distributions of rainfall intensity were obtained from eighteen rain gauges around the landslides. The model prediction capability was evaluated by using the receiver operating characteristic (ROC) curve. Considering to the analysis results, it was found that the model can predict the unstable areas (FS<1) where occur the hillslopes surrounding the peak of the mountain. The accuracy of the model was 0.737 for the Khao Phnom landslide.