Numerical Assessment of Shallow Landslide Using the Distributed Hydrological–Geotechnical Model in a Large Scale (Book Chapter, International)

Kyushu is the third largest island of Japan. The natural hazards accompanied with geomorphic changes like landslides and debris flows occur at many places in Kyushu region. In this study, a hydrological–geotechnical modelling system was applied in Kyushu using observed rainfall for a regional shallow landslide prediction system. The physically based distributed landslide model has been developed by integrating a grid-based distributed kinematic wave rainfall-runoff model with an infinite slope stability approach. The resulting time-invariant landslide susceptibility map shows good agreement with thespatial patterns of observed landslides in Kyushu region. Application of the model to calculate the shallow landslides shows that the model can successfully simulate the effect of rainfall movement and intensity on the spatiotemporal dynamic of hydrological variables that trigger shallow landslides. The results of this study can be used to develop the potential applicability of the modelling system for shallow landslide disaster predictions and warnings. K. Sassa et al. (eds.), Landslide Science for a Safer Geoenvironment, Vol. 1, Springer International Publishing Switzerland 2014