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Rainfall-triggered landslides in the Lisbon region over 2006 and relationships with the North Atlantic oscillation

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dc.contributor.authorZêzere, José
dc.contributor.authorTrigo, R. M.
dc.contributor.authorFragoso, Marcelo
dc.contributor.authorOliveira, Sérgio
dc.contributor.authorGarcia, Ricardo A C
dc.date.accessioned2019-02-18T15:06:29Z
dc.date.available2019-02-18T15:06:29Z
dc.date.issued2008
dc.description.abstractLandslides occurred in the Lisbon area during the last 50 years were almost always induced by rainfall and have been used to establish rainfall thresholds for regional landslide activity. In 2006, three new rainfall-triggered landslide events occurred in the study area, namely on the 20 March, the 25–27 October, and the 28 November. Landslide events occurred in March and October 2006 include shallow translational slides and few debris flows, and the corresponding absolute antecedent rainfall was found to be above the threshold for durations ranging from 4 to 10 days. These events also fit the combined threshold of daily precipitation and 5 days calibrated antecedent rainfall values. Likewise the landslide event that took place in late November 2006 includes some slope movements with deeper slip surfaces, when compared with landslides dating from March and October. Moreover, the corresponding absolute antecedent rainfall was also found to be above the 40-day period rainfall threshold. Here we characterize in detail the short and long-term atmospheric circulation conditions that were responsible for the intense rainfall episodes that have triggered the corresponding landslide events. It is shown that the three rainfall episodes correspond to considerably different synoptic atmospheric patterns, with the March episode being associated to an intense cut-off low system while the October and November episodes appear to be related to more typical Atlantic low pressure systems (and associated fronts) travelling eastwards. Finally, we analyse the role played by the North Atlantic Oscillation (NAO) during those months marked by landslide activity. It is shown that the NAO index was consistently negative (usually associated with above average precipitation) for the months prior to the landslide events, i.e. between October 2005 and March 2006, and again between August and October 2006.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationZêzere, J. L., Trigo, R. M., Fragoso, M., Oliveira, S. C., & Garcia, R. A. C. (2008). Rainfall-triggered landslides in the Lisbon region over 2006 and relationships with the North Atlantic oscillation. Natural Hazards and Earth System sciences, 8(3), 483–499. https://doi.org/10.5194/nhess-8-483-2008.pt_PT
dc.identifier.doi10.5194/nhess-8-483-2008pt_PT
dc.identifier.issn1561-8633
dc.identifier.issn1684-9981
dc.identifier.urihttp://hdl.handle.net/10451/37040
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCopernicus Publicationspt_PT
dc.relation.publisherversionhttps://www.nat-hazards-earth-syst-sci.net/8/483/2008/nhess-8-483-2008.pdfpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectRainfall-triggered landslidespt_PT
dc.subjectLisbonpt_PT
dc.subjectNorth Atlantic Oscillationpt_PT
dc.titleRainfall-triggered landslides in the Lisbon region over 2006 and relationships with the North Atlantic oscillationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage499pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage483pt_PT
oaire.citation.titleNatural Hazards and Earth System Sciencespt_PT
oaire.citation.volume8pt_PT
person.familyNameZêzere
person.familyNameFragoso
person.familyNameOliveira
person.familyNameGarcia
person.givenNameJosé Luís
person.givenNameMarcelo
person.givenNameSérgio
person.givenNameR.A.C.
person.identifierH-9956-2013
person.identifier189612
person.identifier.ciencia-id511D-EE6B-47E3
person.identifier.ciencia-id701B-F3F7-5673
person.identifier.ciencia-id1B10-8CE2-1F13
person.identifier.ciencia-idBC12-77B6-7801
person.identifier.orcid0000-0002-3953-673X
person.identifier.orcid0000-0001-7272-3089
person.identifier.orcid0000-0003-0883-8564
person.identifier.orcid0000-0002-1036-6271
person.identifier.ridF-2991-2010
person.identifier.ridM-8412-2016
person.identifier.ridJ-8719-2013
person.identifier.scopus-author-id6507109389
person.identifier.scopus-author-id23988281600
person.identifier.scopus-author-id24779631800
person.identifier.scopus-author-id55454646500
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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