Triggering conditions and mobility of debris flows associated to complex earthflows

Malet, Jean-Philippe; Laigle, Dominique; Remaître, Alexandre; Maquaire, Olivier

doi:10.1016/j.geomorph.2004.09.014

Cited by 121 publications

(88 citation statements)

References 34 publications

(56 reference statements)

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“…Due to their sediment volume, and their high mobility, debris-flows induced by such landslide types are very dangerous. For hazard assessment, it is therefore important to understand why and how some of these mudslides transform into debris-flows while most of them stabilize and to analyze their hydrological and geomechanical behaviour, which determine the runout characteristics (Malet et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Flow-type failures in fine-grained soils: an important aspect in landslide hazard analysis

Asch

Jean-Philippe

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. Forecasting the possibility of flow-type failures within a slow-moving landslide mass is rarely taken into account in quantitative hazard assessments. Therefore, this paper focuses on the potential transition of sliding blocks (slumps) into flow-like processes due to the generation of excess pore water pressure in undrained conditions. The generation of excess pore water pressure may be the consequence of deformation of the landslide body during motion. Two model concepts are proposed and discussed. The first concept is the so called strain concept model where emphasis is laid on strain changes due to differential movement within the moving mass. This may create zones of compression and dilation and consequently excess pore water pressures. The second concept is the so called topographical concept model which focuses on changes in the stress field of the landslide caused by geometric changes in topography of the moving body. Both models were tested on two slumps which developed in secondary scarps of the Super-Sauze mudslide in the Barcelonnette Basin (South French Alps). The slump which developed in 1999 showed complete fluidization; all the material was removed from the source area and transformed into a mudflow. The second slump, dated from 2006, did not show fluidization; it has a relative short displacement and all the material remained in the source area. It appeared that the strain concept model predicted flow-type failure for both slumps, after relative short displacements, while the topographical concept model predicted only flow-type failure for the 1999 slump and not for the 2006 slump. The strain concept model seems too conservative in forecasting the fluidization potential of slumping blocks.Correspondence to: J.-P. Malet

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Section: Introductionmentioning

confidence: 99%

Flow-type failures in fine-grained soils: an important aspect in landslide hazard analysis

Asch

Jean-Philippe

2009

Nat. Hazards Earth Syst. Sci.

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“…Of particular importance to the present analysis are the previous investigations that demonstrate the applicability of limit equilibrium methods for investigating the stability and triggering mechanisms of slope failures in the alcoves of terrestrial gullies and hollows (e.g., Hanberg and Tripp, 1990;Lee et al, 1999;Özdemir and Delikanli, 2008;Crosta, 2001;Malet et al, 2005;Brideau et al, 2006Brideau et al, , 2007Ulusay et al, 2007;Poisel et al, 2009;and many others). These studies show that slope stability analysis based on limit equilibrium methods is an essential tool for understanding the geologic conditions that facilitate the growth of gully alcoves on Earth.…”

Section: Methodsmentioning

confidence: 97%

Constraints on mechanisms for the growth of gully alcoves in Gasa crater, Mars, from two-dimensional stability assessments of rock slopes

Okubo

Tornabene

Lanza

2011

Icarus

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“…Landslides are a major source of sediments in numerous torrential systems and the spatial and temporal variability of their activity is difficult to estimate (Korup, 2004;Mathys and Poesen, 2005;Schuerch et al, 2006). Landslides situated near the watercourses interact with the flow by increasing the sediment load or by forming an obstacle to the water circulation (Schuerch et al, 2006), and even by favouring large debris-flow events (Malet et al, 2005). The volumes involved can vary radically from one landslide to another, and also seasonally, with the maximum mobilised volumes generally in spring and winter (Schuerch et al, 2006).…”

Section: Sediment Storagesmentioning

confidence: 99%

The contribution of geomorphological mapping to sediment transfer evaluation in small alpine catchments

et al. 2010

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The assessment of sediment transfer processes is necessary to understand the hydro-geomorphological functioning of small alpine watersheds prone to channelised debris flows because their occurrence often depends on the amount of debris available in the gully systems. Therefore, sediment budgets should be studied through the identification of erosion, transport and deposition processes. Sediment transfer processes were investigated in a small catchment by field measurements and, more specifically, through the application of a process-based geomorphological mapping method. The proposed methodology is based on data directly derived from GIS analysis using high-resolution DEM, field measurements and aerial photograph interpretations. It has been conceived to estimate sediment transfer dynamics, taking into account the role of different sediment stores in the torrential system. The proposed geomorphological mapping methodology is quite innovative in comparison with most legend systems that are not adequate for mapping comprehensively active and complex geomorphological systems such as debris-flow catchments. Maps representing the various sediment storages and their relationships can be used for hydro-geomorphological hazard mitigation.

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Triggering conditions and mobility of debris flows associated to complex earthflows

Cited by 121 publications

References 34 publications

Flow-type failures in fine-grained soils: an important aspect in landslide hazard analysis

Flow-type failures in fine-grained soils: an important aspect in landslide hazard analysis

Constraints on mechanisms for the growth of gully alcoves in Gasa crater, Mars, from two-dimensional stability assessments of rock slopes

The contribution of geomorphological mapping to sediment transfer evaluation in small alpine catchments

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