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Mapping susceptibility of rainfall-triggered shallow landslides using a probabilistic approach

  • Original Article
  • Published:
Environmental Geology

Abstract

To prepare a landslide susceptibility map is essential to identify hazardous regions, construct appropriate mitigation facilities, and plan emergency measures for a region prone to landslides triggered by rainfall. The conventional mapping methods require much information about past landslides records and contributing terrace and rainfall. They also rely heavily on the quantity and quality of accessible information and subjectively of the map builder. This paper contributes to a systematic and quantitative assessment of mapping landslide hazards over a region. Geographical Information System is implemented to retrieve relevant parameters from data layers, including the spatial distribution of transient fluid pressures, which is estimated using the TRIGRS program. The factor of safety of each pixel in the study region is calculated analytically. Monte Carlo simulation of random variables is conducted to process the estimation of fluid pressure and factor of safety for multiple times. The failure probability of each pixel is thus estimated. These procedures of mapping landslide potential are demonstrated in a case history. The analysis results reveal a positive correlation between landslide probability and accumulated rainfall. This approach gives simulation results compared to field records. The location and size of actual landslide are well predicted. An explanation for some of the inconsistencies is also provided to emphasize the importance of site information on the accuracy of mapping results.

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Abbreviations

c′:

effective cohesion

D :

index parameter for simulation accuracy

\( \ifmmode\expandafter\bar\else\expandafter\=\fi{D} \) :

normalized, d

D o :

diffusivity

FS:

factor of safety

I :

indicator function

\( I_{{{\text{R}}_{{{\text{sim,}}{\kern 1pt} {i}}} }} \) :

simulated reliability of pixel i

I z :

initial infiltration rate

K z :

conductivity

N realization :

number of realizations

P F :

failure probability

u :

fluid pressure

Z :

sliding depth

α:

slope angle

ϕ′:

effective friction angle

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Authors and Affiliations

  1. Civil Engineering Department, National Chi Nan University, Nantou, 545, Taiwan

    Chia-Nan Liu & Chia-Chen Wu

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  1. Chia-Nan Liu
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  2. Chia-Chen Wu
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Correspondence to Chia-Nan Liu.

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Liu, CN., Wu, CC. Mapping susceptibility of rainfall-triggered shallow landslides using a probabilistic approach. Environ Geol 55, 907–915 (2008). https://doi.org/10.1007/s00254-007-1042-x

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