第１部門②

[2A07-12-02] Accuracy Evaluation of Landslide Simulation using Depth Integrated Particle Method

*Fazlul Habib Chowdhury¹, Takashi Matsushima¹ (1. University of Tsukuba)

Keywords:Depth Integrated Particle Method, Slope Failure, Shallow Landslide

DIPM (depth-integrated particle method) is an effective numerical method suitable for sediment-related disaster simulation of a very wide area with detailed topographic information. In DIPM, the behavior of the flowing mass is governed by Manning's coefficient n related to bottom shear stress and the critical deposition angle i_cr related to the yield stress. Flow simulations were conducted for slope failures during Hokkaido Eastern Iburi Earthquake (2018). Geological conditions, vegetation, and water content influenced the detection of the material parameters through flow simulation. The average value for n and i_cr are 0.1 and 6°, respectively, with an average accuracy of 66%.