Analysis of time-varying rainfall infiltration induced landslide |
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Authors: | Chen Chien-Yuan Chen Tien-Chien Yu Fan-Chieh Lin Sheng-Chi |
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Institution: | (1) National Science and Technology Center for Disaster Reduction, 3F, No 106, Sec 2, HoPing E Rd, Taipei, 106, Taiwan;(2) National Ping-Tung University, Taiwan;(3) National Chung Hsing University, Taiwan |
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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. |
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Keywords: | GIS Slope-stability Landslide Pore-water pressure Infiltration |
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