Flow behaviour and runout modelling of a complex debris flow in a clay‐shale basin

Remaître, Alexandre; Malet, Jean-Philippe; Maquaire, Olivier; Ancey, Christophe; Locat, Jacques

doi:10.1002/esp.1162

Cited by 75 publications

(60 citation statements)

References 21 publications

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“…According to scouring phenomena, proportion of fine elements increases with the distance to the triggering areas. This has been either observed during the 1996 debris-flow event (Remaître et al, 2005b).…”

Section: Sedimentology and Rheology Of The 2003 Debris Flowmentioning

confidence: 86%

Influence of check dams on debris-flow run-out intensity

Remaître¹,

Asch

Malet

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. Debris flows are very dangerous phenomena claiming thousands of lives and millions of Euros each year over the world. Disaster mitigation includes nonstructural (hazard mapping, insurance policies), active structural (drainage systems) and passive structural (check dams, stilling basins) countermeasures. Since over twenty years, many efforts are devoted by the scientific and engineering communities to the design of proper devices able to capture the debris-flow volume and/or break down the energy. If considerable theoretical and numerical work has been performed on the size, the shape and structure of check dams, allowing the definition of general design criteria, it is worth noting that less research has focused on the optimal location of these dams along the debris-flow pathway.In this paper, a methodological framework is proposed to evaluate the influence of the number and the location of the check dams on the reduction of the debris-flow intensity (in term of flow thickness, flow velocity and volume). A debris-flow model is used to simulate the run-out of the debris flow. The model uses the Janbu force diagram to resolve the force equilibrium equations; a bingham fluid rheology is introduced and represents the resistance term. The model has been calibrated on two muddy debris-flow events that occurred in 1996 and 2003 at the Faucon watershed (South French Alps).Influence of the check dams on the debris-flow intensity is quantified taking into account several check dams configurations (number and location) as input geometrical parameters. Results indicate that debris-flow intensity is decreasing with the distance between the source area and the first check dams. The study demonstrates that a small number of check dams located near the source area may decrease substantially the debris-flow intensity on the alluvial fans.

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Section: Sedimentology and Rheology Of The 2003 Debris Flowmentioning

confidence: 86%

Influence of check dams on debris-flow run-out intensity

Remaître¹,

Asch

Malet

et al. 2008

Nat. Hazards Earth Syst. Sci.

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“…Numerous studies were conducted for the analysis of mass movements (Flageollet et al, 1999;Malet et al, 2005a;Maquaire et al, 2003;Razak et al, 2011;Remaître et al, 2005;Thiery, 2007;Thiery et al, 2014) and several landslide types were mapped and analysed along the slopes (Fig. 1a).…”

Section: Study Areamentioning

confidence: 99%

Analysis of a landslide multi-date inventory in a complex mountain landscape: the Ubaye valley case study

Schlögel

Malet

Reichenbach

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. In the paper we analyse a multi-date landslide inventory prepared for a mountainous area affected by several landslide types with different degrees of activity, we attempt to quantify the uncertainties associated to the mapping, we measure the evolution of morphological indicators and estimate landslide activity and temporal occurrence. The inventory, covering the period 1956-2010, is prepared for the middle section of the Ubaye valley (southern French Alps) based on the analysis of multi-source documents (geomorphological maps, historical reports of landslide events, field surveys, orthophotographs and SAR (synthetic aperture radar) satellite images). The uncertainties derived from the expert interpretation of different sources of information, the landslide morphological features and the affected land covers are taken into account in relation to the source documents.Morphological indicators are calculated to describe quantitatively the evolution of the landslides (length, area, relative elevation, runout distance). Frequency-area density functions are computed to estimate the changes in the landslide distributions and a Poisson model is used to estimate the probability of reactivation of the observed landslides and the occurrence of new failures. The proposed multi-date inventory and the associated statistics provide additional information to the event catalogue managed by the local policy makers.

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“…Hence the fraction of fine elements may increase during the run out. In such a case the presence of colloidal fractions may increase yield stresses (Remaître et al 2005a(Remaître et al , 2005b. Because of the lack of information regarding the behavior, the footprints and velocity distributions of past events, it was not possible to parameterize the area regarding the Bingham model with back analyses.…”

Section: Run-out Characterizationmentioning

confidence: 99%

ASCHFLOW - A dynamic landslide run-out model for medium scale hazard analysis

Luna

Blahůt

Asch

et al. 2016

Geoenviron Disasters

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Background: Landslides hazard analyses entail a scale-dependent approach in order to mitigate accordingly the damages and other negative consequences at the respective scales of occurrence. Medium or large scale landslide run-out modelling for many possible landslide initiation areas has been a very difficult task in the past. This arises from the inability of the run-out models to compute the displacement with a large amount of individual initiation areas as it turns out to be computationally strenuous. Most of the existing physically based run-out models have difficulties in handling such situations. For this reason, empirical methods have been used as a practical mean to predict landslides mobility at a medium scale (1: 10,000 to 1: 50,000). They are the most widely used techniques to estimate the maximum run-out distance and affected zones not only locally but also regionally. In this context, a medium scale numerical model for flow-like mass movements in urban and mountainous areas was developed.

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Flow behaviour and runout modelling of a complex debris flow in a clay‐shale basin

Cited by 75 publications

References 21 publications

Influence of check dams on debris-flow run-out intensity

Influence of check dams on debris-flow run-out intensity

Analysis of a landslide multi-date inventory in a complex mountain landscape: the Ubaye valley case study

ASCHFLOW - A dynamic landslide run-out model for medium scale hazard analysis

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