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Environmental Geology

, Volume 48, Issue 4–5, pp 466–479 | Cite as

Analysis of time-varying rainfall infiltration induced landslide

  • Chen Chien-YuanEmail author
  • Chen Tien-Chien
  • Yu Fan-Chieh
  • Lin Sheng-Chi
Original Article

Abstract

A case study of rainstorm-induced landslide is modeled following the hourly rainfall time series from the stage of infiltration caused by induced slope movement and soil saturated to excess pore pressures—Transient Rainfall Infiltration and Grid-based Regional Slope-Stability Analysis (TRIGRS). The grid-based landslide stability analysis was conducted to model the increased pore pressures and runoff in the study area under the specified rainfall conditions. The generated time variances of pore pressures help determine landslide characteristics and mechanisms under rainfall conditions. Inputs of soil properties and permeability parameters for landslide stability analysis in the study area were prepared by TRIGRS adopted for transient infiltration analysis. Results of the analyses show that under heavy rainfall conditions, the infiltrated slope is unstable and the time of debris masses movement initiated is correlated to the recorded time. In the initiated landslide, characteristics and effects are considered and reflected in the numerical modeling under combinations of topography, land use, climatic and geological conditions. Results reveal that there is a plane failure surface and a potential circular failure surface at the study site besides the rock topple failures in the crest. A grid-based slope-stability analysis incorporated with the GIS spatial functions is more advantageous than the traditional two-dimensional analysis for specified slope profiles to determine the whole behavior of a slope.

Keywords

GIS Slope-stability Landslide Pore-water pressure Infiltration 

Notes

Acknowledgments

The authors acknowledge the anonymous reviewers for their critical review of the manuscript and for the improvement of its English usage.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Chen Chien-Yuan
    • 1
    Email author
  • Chen Tien-Chien
    • 2
  • Yu Fan-Chieh
    • 3
  • Lin Sheng-Chi
    • 1
  1. 1.National Science and Technology Center for Disaster ReductionTaipeiTaiwan
  2. 2.National Ping-Tung UniversityTaiwan
  3. 3.National Chung Hsing UniversityTaiwan

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