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Rainfall thresholds for landslide activity in Portugal: a state of the art

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dc.contributor.authorZêzere, José
dc.contributor.authorVaz, Teresa
dc.contributor.authorda Silva Pereira, Susana
dc.contributor.authorOliveira, Sérgio
dc.contributor.authorMarques, R.
dc.contributor.authorGarcia, Ricardo A C
dc.date.accessioned2017-07-11T10:46:59Z
dc.date.available2017-07-11T10:46:59Z
dc.date.issued2015
dc.description.abstractRainfall is the most important physical process responsible for the landslide triggering in Portugal. Results obtained worldwide have shown that control of rainfall on landslides differs substantially depending upon landslide depth and kinematics and the affected material. Therefore, the critical rainfall conditions for failure are not the same for different types of landslides, and may be strongly influenced by regional geologic and geomorphologic conditions. Rapid debris flows are typically triggered by very intense showers concentrated in just a few hours, and shallow translational soil slips are usually triggered by intense precipitation falling within the 1–15 days long range. On the contrary, activity of deep-seated landslides of rotational, translational and complex types is related to periods of nearly constant rainfall, lasting from several weeks to several months. The different rainfall intensity–duration conditions are associated with different hydrologic mechanisms for slope failure. The generation of surface run-off and high peak discharges in first-order mountain catchments is a critical triggering mechanism for debris flows. The intense rainfall allows the rapid growth of pore water pressure and the drop of capillarity forces that sustain the apparent cohesion of thin soils. As a consequence, shallow soil slips occur within the soil material or at the contact with the underlying less permeable bedrock. Long lasting rainfall episodes enable the steady rise of the groundwater table and the development of positive pore water pressures into the soil. Consequently, deep-seated failures occur in relation to the reduction of shear strength of affected materials. In this work, we present the state of the art concerning the proposition of empirical rainfall thresholds in Portugal for different types of landslides observed in different zones of the country: the Lisbon region, the Douro Valley and the NW Mountains, and the Povoação Municipality in São Miguel Island (Azores). The empirical thresholds applied in Portugal are based on the identification of past landslide events and include (i) the computation of antecedent rainfall threshold defined by linear regression, (ii) the normalization of rainfall by the mean annual precipitation, (iii) the definition of lower limit and upper limit rainfall thresholds and (iv) the definition of combined rainfall thresholds, which integrates the rainfall event and the antecedent rainfall for different time periods.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationZêzere, J.L., Vaz, T., Pereira, S. et al. (2015). Rainfall thresholds for landslide activity in Portugal: a state of the art. Environ Earth Sci, 73, 2917–2936. https://doi.org/10.1007/s12665-014-3672-0pt_PT
dc.identifier.doi10.1007/s12665-014-3672-0pt_PT
dc.identifier.issn1866-6280
dc.identifier.issn1866-6299
dc.identifier.urihttp://hdl.handle.net/10451/28291
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Verlagpt_PT
dc.subjectLandslidespt_PT
dc.subjectEmpirical thresholdspt_PT
dc.subjectRainfall intensity–durationpt_PT
dc.subjectPortugalpt_PT
dc.titleRainfall thresholds for landslide activity in Portugal: a state of the artpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2936pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage2917pt_PT
oaire.citation.titleEnvironmental Earth Sciencespt_PT
oaire.citation.volume73pt_PT
person.familyNameZêzere
person.familyNameVaz
person.familyNameda Silva Pereira
person.familyNameOliveira
person.familyNameGarcia
person.givenNameJosé Luís
person.givenNameTeresa
person.givenNameSusana
person.givenNameSérgio
person.givenNameR.A.C.
person.identifierH-9956-2013
person.identifier.ciencia-id511D-EE6B-47E3
person.identifier.ciencia-id2616-729A-B185
person.identifier.ciencia-id1B10-8CE2-1F13
person.identifier.ciencia-idBC12-77B6-7801
person.identifier.orcid0000-0002-3953-673X
person.identifier.orcid0000-0001-7050-6160
person.identifier.orcid0000-0002-9674-0964
person.identifier.orcid0000-0003-0883-8564
person.identifier.orcid0000-0002-1036-6271
person.identifier.ridB-8239-2016
person.identifier.ridM-8412-2016
person.identifier.ridJ-8719-2013
person.identifier.scopus-author-id6507109389
person.identifier.scopus-author-id24779631800
person.identifier.scopus-author-id55454646500
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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