Regional-scale modelling of liquefaction-induced shallow landslides in unsaturated slopes

Xiang Li, Zhichen Song, José J. Lizárraga*, Giuseppe Buscarnera

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Regional modelling of rainfall-induced landslide triggering poses several technical challenges. These events can originate from a number of hydro-mechanical processes, such as soil-strength degradation, development of localized zones of pore-water pressures, liquefaction, among others. At the same time, the interplay between the spatial variability of topographic attributes, soil properties and transient infiltration can lead to a widespread distribution of distinct slope failure mechanisms across the same landscape. To this aim, this contribution describes a simulation platform for the efficient generation of storm-induced, landslide susceptibility maps in which different slope instability mechanisms can be considered. The framework relies on a vectorized finite element (FE) algorithm that performs fully-coupled simulations of transient infiltration in unsaturated soils, while input and output processing stages are linked to a Geographical Information System. To illustrate the capabilities of the proposed framework, the role of several hydro-mechanical processes on the inception of slope instability are first explored (i.e., coupled flow-deformation analyses, constitutive couplings). After this, results of regional-scale simulations are presented, where it is shown that such considerations can affect the computed spatio-temporal patterns of landslide triggering. Lastly, approaches to incorporate uncertainty of input data into landslide susceptibility zonation by using spatially-correlated random fields are discussed. The proposed framework provides an important step towards the development of robust, physically-based models for regional landslide hazard assessment.

Original languageEnglish (US)
Title of host publicationDebris-Flow Hazards Mitigation
Subtitle of host publicationMechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation
EditorsJason W. Kean, Jeffrey A. Coe, Paul M. Santi, Becca K. Guillen
PublisherAssociation of Environmental and Engineering Geologists
Pages369-376
Number of pages8
ISBN (Electronic)9780578510828
StatePublished - 2019
Event7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Golden, United States
Duration: Jun 10 2019Jun 13 2019

Publication series

NameDebris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation

Conference

Conference7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment
CountryUnited States
CityGolden
Period6/10/196/13/19

Keywords

  • Distributed modelling
  • Flowslides
  • Infiltration
  • Shallow landslides
  • Spatial uncertainty

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Li, X., Song, Z., Lizárraga, J. J., & Buscarnera, G. (2019). Regional-scale modelling of liquefaction-induced shallow landslides in unsaturated slopes. In J. W. Kean, J. A. Coe, P. M. Santi, & B. K. Guillen (Eds.), Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation (pp. 369-376). (Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation). Association of Environmental and Engineering Geologists.