Risk evaluation of shallow landslides using the physical rule model

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  • KUROKAWA Ushio
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • ABE Kazutoki
    Department of Forest Science and Resource, College of Bioresource Science, Nihon University
  • DAIMARU Hiromu
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • MATSUURA Sumio
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute

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Other Title
  • 物理則モデルによる表層崩壊危険度評価
  • ブツリソク モデル ニ ヨル ヒョウソウ ホウカイ キケンド ヒョウカ

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Abstract

For 2,100 place which divided 4km×4km basin in the 50m mesh size, dangerous ground estimate technique which combined the three-dimensional saturated-unsaturated flow analysis with the stability analysis of the infinite slope was developed in order to reproduce the infiltration process of the rainfall. In addition, the setting method of estimated formula of soil layer depth and effect of the vegetation was proposed in order to carry out the dangerous ground estimate. Increase and decrease of the dangerous ground by the change of amount of rainfall was able to be simulated, when the calculation was carried out on the basis of actual rainfall data. From the calculation result, 40 places accorded with actual landslides 88 places, and the accuracy became 45.5%.

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