Simplified simulation of rock avalanches and subsequent debris flows with a single thin-layer model: Application to the Prêcheur river (Martinique, Lesser Antilles)

Peruzzetto, Marc; Lévy, Clara; Thiéry, Yannick; Grandjean, Gilles; Mangeney, A.; Lejeune, Anne‐Marie; Nachbaur, Aude; Legendre, Yoann; Vittecoq, Benoît; Clouard, Valérie; Dewez, Thomas; Fontaine, Fabrice R.; Mergili, Martin; Lagarde, Sophie; Komorowski, Jean‐Christophe; Friant, Anne Le; Lemarchand, Arnaud

doi:10.1016/j.enggeo.2021.106457

Cited by 10 publications

(10 citation statements)

References 102 publications

(165 reference statements)

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“…Clouard et al (2013) estimated that a volume of about 2.1 × 10 6 m 3 collapsed between March and May 2010. Between May 2010 and August 2018, the cliff lost about 4.9 × 10 6 m 3 , with a major collapse sequence between January and August 2018 (Quefféléan, 2018;Nachbaur et al, 2019;Peruzzetto, 2021b;Peruzzetto et al, 2022). These destabilizations are often (if not systematically) associated with the remobilization of deposits and the generation of debris and hyper-concentrated flows.…”

Section: Study Sitementioning

confidence: 99%

“…These destabilizations are often (if not systematically) associated with the remobilization of deposits and the generation of debris and hyper-concentrated flows. For instance in June 2010, a major debris flow inundated part the Prêcheur village at the river mouth and severely damaged the bridge crossing the river (Aubaud et al, 2013;Peruzzetto et al, 2022). A new and higher bridge has since been constructed, but major lahars could still destroy it.…”

Section: Study Sitementioning

confidence: 99%

“…The associated damages would be very important. Indeed, using numerical simulations, Peruzzetto et al (2022) showed that a 2.0 × 10 6 m 3 lahar has already the potential to flood a large part of the Prêcheur village.…”

Section: Volume Estimation and Implication For Hazard Assessmentmentioning

confidence: 99%

“…The volume detached from the Samperre cliff between March 2010 and July 2010 is about 2.1 × 10 6 m 3 (Clouard et al, 2013), and 4.9 × 10 6 m 3 between July 2010 and August 2018 (Quefféléan, 2018;Peruzzetto, 2021b;Peruzzetto et al, 2022).…”

Section: Contribution Of Rock Avalanches To Volcano Dismantlingmentioning

confidence: 99%

See 3 more Smart Citations

How 3d volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre Cliff case study (Martinique Island, Lesser Antilles)

Peruzzetto¹,

Legendre²,

Nachbaur

et al. 2022

Preprint

Self Cite

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Abstract. Gravitational instabilities can be significant threats to populations and infrastructures. For hazard assessment, it is of prior importance to estimate the geometry and volume of potential unstable masses. This characterization can be particularly difficult in volcanic context due to the succession of deposition and erosion phases. Indeed, it results in complex layering geometries where the interfaces between geological layers may be neither parallel nor planar. Geometry characterization is all the more complex when unstable masses are located in steep and hardly accessible landscapes, which limits data acquisition. In this work, we show how remote observations can be used to estimate the surface envelope of an unstable mass on a volcanic cliff. We use ortho-photographs, aerial views and topographic surveys to (i) describe the different geological units of the cliff, (ii) identify stable and unstable units, (iii) infer the paleo-morphology of the site and (iv) estimate potential unstable volumes. We use the Samperre cliff in Martinique (Lesser Antilles, French West Indies) as a study site, where recurrent destabilizations since at least 1988 have produced debris flows that threaten populations and infrastructures. Our analysis suggests that the destabilizations occurring on the cliff may be associated to the re opening of a paleo-valley filled by pyroclastic materials. We estimate that between 3.5 × 106 m3 and 8.3 × 106 m3 could still be mobilized by future destabilizations in the coming decades.

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Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Volume Estimation and Implication For Hazard Assessmentmentioning

confidence: 99%

Section: Contribution Of Rock Avalanches To Volcano Dismantlingmentioning

confidence: 99%

See 2 more Smart Citations

How 3d volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre Cliff case study (Martinique Island, Lesser Antilles)

Peruzzetto¹,

Legendre²,

Nachbaur

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Clouard et al (2013) estimated that a volume of about 2.1 × 10 6 m 3 collapsed between March and May 2010. Between May 2010 and August 2018, the cliff lost about 4.9 × 10 6 m 3 , with a major collapse sequence between January and August 2018 (Quefféléan, 2018;Nachbaur et al, 2019;Peruzzetto, 2021b;Peruzzetto et al, 2022). These destabilizations are often (if not systematically) associated with the remobilization of deposits by water and the generation of debris and hyperconcentrated flows.…”

Section: Study Sitementioning

confidence: 99%

How volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre cliff case study (Martinique island, Lesser Antilles)

Peruzzetto¹,

Legendre²,

Nachbaur

et al. 2022

Nat. Hazards Earth Syst. Sci.

Self Cite

View full text Add to dashboard Cite

Abstract. Gravitational instabilities can be significant threats to populations and infrastructure. For hazard assessment, it is important to estimate the geometry and volume of potential unstable masses. This characterization can be particularly difficult in volcanic contexts due to the succession of deposition and erosion phases. Indeed, it results in complex layering geometries in which the interfaces between geological layers may be neither parallel nor planar. Geometry characterization is all the more complex when unstable masses are located in steep and hard to access landscapes, which limits data acquisition. In this work, we show how remote observations can be used to estimate the surface envelope of an unstable mass on a volcanic cliff. We use ortho-photographs, aerial views and topographic surveys to (i) describe the different geological units of the cliff, (ii) characterize the stability of geological units, (iii) infer the paleo-morphology of the site and (iv) estimate potential unstable volumes. We investigate the Samperre cliff in Martinique (Lesser Antilles, French West Indies) as a study site, where recurrent destabilizations since at least 1988 have produced debris flows that threaten populations and infrastructure. Our analysis suggests that the destabilizations occurring on the cliff may be associated with the re-opening of a paleo-valley filled by pyroclastic materials. We estimate that between 3.5×106 and 8.3×106 m3 could still be mobilized by future destabilizations in the coming decades.

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Predisposing, triggering and runout processes at a permafrost‐affected rock avalanche site in the French Alps (Étache, June 2020)

Cathala,

Bock,

Magnin

et al. 2024

Earth Surf Processes Landf

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Although numerous recent studies have explored the relationship between permafrost degradation and rock slope failure, there is still a need for in‐depth investigations to develop relevant hazard assessment approaches. We investigate the predisposing, triggering and propagation processes of a rock avalanche (c. 225,000 m3) that occurred in Vallon d'Étache (France) on 18 June 2020, whose scar was coated by ice and water. Weather records and energy balance models show that the rock avalanche occurred right after the warmest spring and winter since at least 1985, but also right after the spring with the highest water supply anomaly (snowmelt and rainfall). Measured ground surface temperature and geoelectrical surveys reveal that relatively ice‐rich permafrost could exist in the NW face (release area) while it is inexistent below the SE face, contradicting certain permafrost maps. Heat transfer simulations suggest that the rock avalanche occurred during a transition from cold to warm permafrost conditions at failure depth (30 m), with a temperature increase of up to 0.6°C per decade since 2012 (when considering potential snow cover effect), and current temperature ranging between −3 and −1°C, depending on the applied model forcing. This warming certainly contributed to predispose slope to failure. In addition, the shift towards warm permafrost and water infiltration potentially enhancing permafrost degradation along fractures through heat advection or favouring the development of high hydrostatic pressures may have played as triggering factors. Finally, propagation simulations show that the rock avalanche involved several phases with different rheological properties due to the incorporation of snow and material segregation within the deposit. These new insights at various scales highlight the complexity of the triggering and propagation processes of rock slope failure occurring in high mountains, a significant part of which can be linked to snow effects on ground temperature, water supply and rheological properties.

show abstract

Simplified simulation of rock avalanches and subsequent debris flows with a single thin-layer model: Application to the Prêcheur river (Martinique, Lesser Antilles)

Cited by 10 publications

References 102 publications

How 3d volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre Cliff case study (Martinique Island, Lesser Antilles)

How 3d volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre Cliff case study (Martinique Island, Lesser Antilles)

How volcanic stratigraphy constrains headscarp collapse scenarios: the Samperre cliff case study (Martinique island, Lesser Antilles)

Predisposing, triggering and runout processes at a permafrost‐affected rock avalanche site in the French Alps (Étache, June 2020)

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