Assessment of Rainstorm-induced Shallow Landslide Hazard with Hydrodynamic Model

Key words: 
• rainstorm-induced shallow landslide /
• limit equilibrium method /
• hydrodynamic model /
• landslide stability analysis

Abstract: Shallow landslide induced by rainstorm can pose great threats to public safety and social and econormic development, but the knowledge of shallow landslide formation mechanism is limited so far. There is no reilable analysis method on shallow landslide hazard. In this paper, hydrodynamic model of heavy rainfall-induced flash flood is developed. The model can better simulate the hydrological processes of rainstorm runoff, convergence and infiltration, etc. The rainstorm hydrodynamic landslide model is used to assess rainstorm-induced shallow landslide hazard, with the limit equilibrium method of slope. The model has been applied to a typical shallow landslide-prone area. The calculation results show that the hydrodynamic model can better simulate the process of rainfall infiltration, the assessment of shallow landslide hazard, based on the model, is more reasonable. It provided a new technology to defense effectively rainstorm-induced shallow landslide.