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Paraglacial slope failures in the Aran valley (Central Pyrenees)

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dc.contributor.authorFernandes, Marcelo
dc.contributor.authorOliva, Marc
dc.contributor.authorVieira, Gonçalo
dc.date.accessioned2020-12-29T15:25:08Z
dc.date.available2020-12-29T15:25:08Z
dc.date.issued2020
dc.description.abstractSlope failures are widespread phenomena in mid-latitude mountain environments that were glaciated during the Last Glacial Cycle. This is the case of the Aran valley, in the Upper Garonne catchment, Central Pyrenees, that included glaciers several hundred meters thick. Following postglacial warming and ice thinning, the recently deglaciated slopes were subject to intense stress readjustments - the so-called paraglacial dynamics. We have identified up to 135 major slope failures in the Aran valley, with only 10 units occurring outside the glaciated domain of the maximum ice extent of the Last Glacial. The presence of polished bedrock surfaces, till and moraine ridges next to some of these features evidence a close connection between glacial and slope processes. We have detected different types of slope failures affecting both bedrock (12 large catastrophic rock slope failures, 16 rock-slope deformation, 34 rockfalls, and 49 rockslides) and unconsolidated glacial sediments (14 slope readjustments on drift-mantled slopes). The average altitude of rock slope failures oscillates between 1551 and 1991 m, with a mean length ranging from 147 to 905 m and a width between 247 and 513 m. The affected surface is also highly variable, oscillating between 0.02 and 126.2 ha. Slope failures occur in different lithological settings, but they are most frequent in slate, lutite and limestone bedrocks. We conclude that most of the failures show a paraglacial origin, though other factors (i.e. lithology and topography) promoted slope instability.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFernandes, M., Oliva, M. & Vieira, G. (2020). Paraglacial slope failures in the Aran valley (Central Pyrenees). Quaternary International, 566–567, 24-38. https://doi.org/10.1016/j.quaint.2020.07.045pt_PT
dc.identifier.doi10.1016/j.quaint.2020.07.045pt_PT
dc.identifier.issn1040-6182
dc.identifier.urihttp://hdl.handle.net/10451/45581
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationSFRH/139569/ 2018pt_PT
dc.relationCentre of Geographical Studies
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S1040618220304481?via%3Dihubpt_PT
dc.subjectAran valleypt_PT
dc.subjectCentral pyreneespt_PT
dc.subjectGlaciationpt_PT
dc.subjectParaglacial dynamicspt_PT
dc.subjectSlope failurespt_PT
dc.titleParaglacial slope failures in the Aran valley (Central Pyrenees)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUIDB/00295/2020
oaire.awardTitleCentre of Geographical Studies
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00295%2F2020/PT
oaire.citation.endPage38pt_PT
oaire.citation.startPage24pt_PT
oaire.citation.titleQuaternary Internationalpt_PT
oaire.citation.volume566-567pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameVieira Fernandes
person.familyNameOliva
person.familyNameBrito Guapo Teles Vieira
person.givenNameMarcelo
person.givenNameMarc
person.givenNameGonçalo
person.identifierhttps://www.researchgate.net/profile/Marcelo-Fernandes-11
person.identifierG-5958-2010
person.identifier.ciencia-idDC16-4FD0-6F5B
person.identifier.ciencia-id5510-AC71-085A
person.identifier.ciencia-id2519-6583-CAEA
person.identifier.orcid0000-0001-6840-4317
person.identifier.orcid0000-0001-6521-6388
person.identifier.orcid0000-0001-7611-3464
person.identifier.ridK-5423-2014
person.identifier.scopus-author-idhttps://www.scopus.com/authid/detail.uri?authorId=57204148423
person.identifier.scopus-author-id35225198700
person.identifier.scopus-author-id7005863976
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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