Landslide Hazard Mapping Based on Slope Stability Analysis Considering Rainfall Spatial Uncertainty

Abstract

This study presents a mapping method for evaluating landslide hazards in consideration of the spatial uncertainty of rainfall. Spatial modes of the rainfall in a target area are extracted using a mode decomposition technique, and virtual rainfall events that may occur in the target area is generated using the spatial modes. Slope stability analysis with the assumption of the infinite slope is then performed using the virtual rainfall data, and a landslide hazard map is created. Based on the obtained results, the influence of the rainfall uncertainty on landslide hazard mapping is discussed.