Rainfall‐induced landslides and debris flows

Crosta, Giovanni B.; Frattini, Paolo

doi:10.1002/hyp.6885

Cited by 132 publications

(70 citation statements)

References 80 publications

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“…Hydrological models can be integrated with slope stability analysis methods to calculate the factor of safety and predict the time and magnitude of landslides (Crosta and Frattini, 2008;Shuin et al, 2012;Aleotti and Chowdhury, 1999;Westen et al, 2006). Combined hydro-mechanical models can roughly be divided into two types: simplified conceptual models (Montrasio and Valentino, 2008;Dai et al, 2002) and numerical models (Stead et al, 2001;Jing, 2003;Brinkgreve et al, 2010;Pastor et al, 2008), and have different levels of complexity depending on the scale and the research purpose.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

Shao

Bogaard

Bakker

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. The effect of preferential flow on the stability of landslides is studied through numerical simulation of two types of rainfall events on a hypothetical hillslope. A model is developed that consists of two parts. The first part is a model for combined saturated/unsaturated subsurface flow and is used to compute the spatial and temporal water pressure response to rainfall. Preferential flow is simulated with a dual-permeability continuum model consisting of a matrix domain coupled to a preferential flow domain. The second part is a soil mechanics model and is used to compute the spatial and temporal distribution of the local factor of safety based on the water pressure distribution computed with the subsurface flow model. Two types of rainfall events were considered: long-duration, low-intensity rainfall, and shortduration, high-intensity rainfall. The effect of preferential flow on slope stability is assessed through comparison of the failure area when subsurface flow is simulated with the dualpermeability model as compared to a single-permeability model (no preferential flow). For the low-intensity rainfall case, preferential flow has a positive effect on drainage of the hillslope resulting in a smaller failure area. For the highintensity rainfall case, preferential flow has a negative effect on the slope stability as the majority of rainfall infiltrates into the preferential flow domain when rainfall intensity exceeds the infiltration capacity of the matrix domain, resulting in larger water pressure and a larger failure area.

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Section: Introductionmentioning

confidence: 99%

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

Shao

Bogaard

Bakker

et al. 2015

Hydrol. Earth Syst. Sci.

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“…Currently, there is a lot of interests in exploring the failure mechanism and characteristics of fast and long runout rockslides via numerical modelling (Utili et al 2014;Crosta et al 2013;Sitar et al 2005;Zhao et al 2012;Boon 2013;Quecedo et al 2004;Crosta et al 2006Crosta et al , 2009Crosta and Frattini 2008). In this paper, a quasi-3D DEM-CFD model is used to investigate the mechanical and hydraulic behaviour of the Vajont rockslide.…”

Section: Introductionmentioning

confidence: 99%

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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This paper investigates the generation of hydrodynamic water waves due to rockslides plunging into a water reservoir. Quasi-3D DEM analyses in plane strain by a coupled DEM-CFD code are adopted to simulate the rockslide from its onset to the impact with the still water and the subsequent generation of the wave. The employed numerical tools and upscaling of hydraulic properties allow predicting a physical response in broad agreement with the observations notwithstanding the assumptions and characteristics of the adopted methods. The results obtained by the DEM-CFD coupled approach are compared to those published in the literature and those presented by Crosta et al. (Landslide spreading, impulse waves and modelling of the Vajont rockslide. Rock mechanics, 2014) in a companion paper obtained through an ALE-FEM method. Analyses performed along two cross sections are representative of the limit conditions of the eastern and western slope sectors. The max rockslide average velocity and the water wave velocity reach ca. 22 and 20 m/s, respectively. The maximum computed run up amounts to ca. 120 and 170 m for the eastern and western lobe cross sections, respectively. These values are reasonably similar to those recorded during the event (i.e. ca. 130 and 190 m, respectively). Therefore, the overall study lays out a possible DEM-CFD framework for the modelling of the generation of the hydrodynamic wave due to the impact of a rapid moving rockslide or rock-debris avalanche.

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“…They can have natural causes, such as heavy rainfall and earthquakes, but also human causes, including urban encroachments and increased surface impermeability to water infiltration. Many international studies have focused on rainfall-induced landslides in the last few decades [4] because it is important for public safety to have a process in place for gauging potential landslide hazards in all susceptible regions [5]. As a consequence, several landslide risk modeling applications have been developed (such as GEOtop [6] and SHETRAN [7]), which are able to calculate risk over large areas using hydrological and mechanical elements.…”

Section: Introductionmentioning

confidence: 99%

“…Research from many disciplines, including engineering geology, soil mechanics, hydrology, and geomorphology, has focused on this subject; the introduction of Geographical Information Systems (GIS) software has made a significant contribution to landslide risk assessment [4,[10][11][12][13]. Various deterministic modeling applications are available for use at different scales [14], such as distributed Shallow Landslide Analysis Models (dSLAMs), which employs physical variables [9,15].…”

Section: Introductionmentioning

confidence: 99%

Developing an Accessible Landslide Susceptibility Model Using Open-Source Resources

Kim

Chae

et al. 2018

Sustainability

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Landslide susceptibility models are important for public safety, but often rely on inaccessible or unaffordable software and geospatial data. Thus, affordable and accessible landslide prediction systems would be especially useful in places that lack the infrastructure for acquiring and analyzing geospatial data. Current landslide susceptibility models and existing methodologies do not consider such issues; therefore, this study aimed to develop an accessible and affordable landslide susceptibility modeling application and methodology based on open-source software and geospatial data. This model used TRIGRS (asc format) and QGIS (Digital Elevation Models (DEMs) extracted from GeoTIFF format) with widely accessible environmental parameters to identify potential landslide risks. In order to verify the suitability of the proposed application and methodology, a case study was conducted on Lantau Island, Hong Kong to assess the validity of the results, a comparison with 1999 landslide locations. The application developed in this study showed a good agreement with the four previous landslide locations marked as highly susceptible, which proves the validity of the study. Therefore, the developing model and the cost-effective approach, in this study simulated the landslide performance well and suggested the new approach of the landslide prediction system.

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Rainfall‐induced landslides and debris flows

Cited by 132 publications

References 80 publications

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Developing an Accessible Landslide Susceptibility Model Using Open-Source Resources

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