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Landslide Early Warning and Susceptibility Zonation of Guwahati City Through Local and Regional Scale Slope Stability Analyses

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Disaster Management and Risk Reduction: Multidisciplinary Perspectives and Approaches in the Indian Context (NERC 2022)

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Abstract

Rainfall-triggered landslides are a major geohazard in the Guwahati region which cannot be convincingly addressed by conventional slope stability approaches. This study attempts to address this issue with the help of advanced analysis considering the concepts of unsaturated soil mechanics involving transient/steady-state phenomena aided by the variation of pore water pressures for providing a predictive model for the potential instability under rainfall infiltration process. It is observed that the matric suction and its effect on the variation of permeability and degree of saturation, as well as the intensity and duration of rainfall, are critical factors in assessing the state of instability. Although landslides in the stated region involve relatively smaller volumes of soil (~100–400 m3), the presence of proximal urbanized areas can possibly induce significant damage to infrastructure and life loss. This study presents the applicability of physically-based models (TRIGRS, SHALSTAB and SINMAP) for assessing the regional-scale landslide susceptibility and hazard in the Guwahati region. The advantages and limitations of the different models are discussed, and the significant results are compared on the basis of the observed landslides. It is concluded from the study that physically-based models can incorporate the quantitative hydrogeological factors (e.g., soil characteristics, rainfall and areal topography) for a successful regional-scale rainfall-induced landslide hazard assessment.

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Author information

Authors and Affiliations

  1. Indian Institute of Technology Guwahati, Assam, India

    Arindam Dey

  2. Jorhat Engineering College, Assam, India

    Chiranjib Prasad Sarma

  3. Indian Institute of Technology Tirupati, Andhra Pradesh, India

    A. Murali Krishna

Authors
  1. Arindam Dey
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  2. Chiranjib Prasad Sarma
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  3. A. Murali Krishna
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Corresponding author

Correspondence to Arindam Dey .

Editor information

Editors and Affiliations

  1. Centre for Disaster Management and Research, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Sudip Mitra

  2. Centre for Disaster Management and Research, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Kaustubh Dasgupta

  3. Centre for Disaster Management and Research, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Arindam Dey

  4. Centre for Disaster Management and Research, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Rajshree Bedamatta

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Dey, A., Sarma, C.P., Krishna, A.M. (2023). Landslide Early Warning and Susceptibility Zonation of Guwahati City Through Local and Regional Scale Slope Stability Analyses. In: Mitra, S., Dasgupta, K., Dey, A., Bedamatta, R. (eds) Disaster Management and Risk Reduction: Multidisciplinary Perspectives and Approaches in the Indian Context. NERC 2022. Springer, Singapore. https://doi.org/10.1007/978-981-99-6395-9_1

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