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The extreme mobility of debris avalanches: A new model of transport mechanism

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPERINOTTO, Helene
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHNEIDER, Jean-Luc
hal.structure.identifierLaboratoire Magmas et Volcans [LMV]
dc.contributor.authorBACHÈLERY, Patrick
hal.structure.identifierIRAMAT-Centre de recherche en physique appliquée à l’archéologie [IRAMAT-CRP2A]
dc.contributor.authorLE BOURDONNEC, François-Xavier
hal.structure.identifierLaboratoire GéoSciences Réunion [LGSR]
dc.contributor.authorFAMIN, Vincent
hal.structure.identifierLaboratoire GéoSciences Réunion [LGSR]
dc.contributor.authorMICHON, Laurent
dc.date.accessioned2024-06-03T09:28:32Z
dc.date.available2024-06-03T09:28:32Z
dc.date.issued2015-12-11
dc.identifier.issn2169-9313en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200215
dc.description.abstractEnLarge rockslide-debris avalanches, resulting from flank collapses that shape volcanoes and mountains on Earth and other object of the solar system, are rapid and dangerous gravity-driven granular flows that travel abnormal distances. During the last 50 years, numerous physical models have been put forward to explain their extreme mobility. The principal models are based on fluidization, lubrication, or dynamic disintegration. However, these processes remain poorly constrained. To identify precisely the transport mechanisms during debris avalanches, we examined morphometric (fractal dimension and circularity), grain size, and exoscopic characteristics of the various types of particles (clasts and matrix) from volcanic debris avalanche deposits of La Réunion Island (Indian Ocean). From these data we demonstrate for the first time that syn-transport dynamic disintegration continuously operates with the increasing runout distance from the source down to a grinding limit of 500 μm. Below this limit, the particle size reduction exclusively results from their attrition by frictional interactions. Consequently, the exceptional mobility of debris avalanches may be explained by the combined effect of elastic energy release during the dynamic disintegration of the larger clasts and frictional reduction within the matrix due to interactions between the finer particles.
dc.language.isoENen_US
dc.title.enThe extreme mobility of debris avalanches: A new model of transport mechanism
dc.typeArticle de revueen_US
dc.identifier.doi10.1002/2015JB011994en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Volcanologieen_US
bordeaux.journalJournal of Geophysical Research : Solid Earthen_US
bordeaux.page8110–8119en_US
bordeaux.volume120en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01351769
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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