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Thresholds for storm impacts on an exposed sandy coastal area in southern Portugal

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dc.contributor.authorAlmeida, L. P.
dc.contributor.authorVousdoukas, Michalis
dc.contributor.authorFerreira, Óscar
dc.contributor.authorRodrigues, B.
dc.contributor.authorMatias, Ana
dc.date.accessioned2018-01-29T17:24:45Z
dc.date.available2018-01-29T17:24:45Z
dc.date.issued2012
dc.description.abstractStorms are one of the most important phenomena responsible for coastal erosion. Their destructive power presents major challenges for coastal management, and knowledge of their characteristics and associated consequences is therefore of paramount importance. In this study, thresholds for storm impacts are defined for a sandy coast in southern Portugal (Faro beach, Ria Formosa) using two different approaches: i) hydrodynamic conditions associated with historical storm impacts (i.e., infrastructural damage); and (ii) computed maximum wave run-up values (RHIGH) compared with beach morphology. Damage thresholds are defined as limits above which the action of a storm exceeds beach front response capability and starts to act directly on human infrastructures. According to method (i), four different thresholds were defined. For individual storms directed from the SW the threshold is a significant wave height of 4.7 m with a storm duration of 2 days, and for storms directed from the SE is a significant wave height of 6 m with a storm duration of at least 2 days. Regarding storm groups, for those directed from the SW the threshold is 2 storms lasting at least 2 days each with significant wave heights greater than 3.5 m, whilst for those directed from the SE the threshold is 3 short storms (lasting 1 day each) with significant wave height over 3.9 m. The return period for the SW storm group threshold is just 1.7 years. For method (ii), beach morphological parameters (DHIGH — highest elevation of the frontal dune; DLOW — elevation of the dune base; and tanβf — foreshore slope) were determined for five chosen cross-shore profiles along the study area, and RHIGH computed for different hydrodynamic conditions. Results were validated through field observations of storm impacts. The lowest thresholds for overwash are along the central part of the study area where a dune crest is absent due to human occupation. The highest thresholds for overwash are on those profiles where a frontal dune is well developed or a foredune ridge is present (western and eastern parts of the study area). This study presents a methodological strategy to compute realistic thresholds for storm impacts along Faro beach based on historical datasets of hydrodynamics and storm impacts information. The approach could be implemented in other coastal areas to provide a comprehensive assessment of the storm impact, requiring only simple information like offshore storm hydrodynamics characteristics, beach morphology and reports of coastal infrastructure damage.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.geomorph.2011.04.047pt_PT
dc.identifier.issn0169-555X
dc.identifier.otherAUT: OFE00989;
dc.identifier.urihttp://hdl.handle.net/10400.1/10339
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationMorphological Impacts and COastal Risks induced by Extreme storm events
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectStorm impactpt_PT
dc.subjectCoastal damagept_PT
dc.subjectRun-uppt_PT
dc.subjectOverwashpt_PT
dc.titleThresholds for storm impacts on an exposed sandy coastal area in southern Portugalpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMorphological Impacts and COastal Risks induced by Extreme storm events
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/202798/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F18476%2F2004/PT
oaire.citation.endPage12pt_PT
oaire.citation.startPage3pt_PT
oaire.citation.titleGeomorphologypt_PT
oaire.citation.volume143-144pt_PT
oaire.fundingStreamFP7
oaire.fundingStreamSFRH
person.familyNameAlmeida
person.familyNameVousdoukas
person.familyNameFerreira
person.familyNameRodrigues
person.familyNameMatias
person.givenNameLuis Pedro
person.givenNameMichalis
person.givenNameÓscar
person.givenNameBrígida
person.givenNameAna
person.identifierR-000-116
person.identifier.ciencia-id2917-AE9E-33C1
person.identifier.ciencia-id1F1C-DF44-94C9
person.identifier.ciencia-id631C-A162-3F1E
person.identifier.ciencia-id2811-D7C1-1DE2
person.identifier.orcid0000-0001-7805-9086
person.identifier.orcid0000-0003-2655-6181
person.identifier.orcid0000-0001-9975-0036
person.identifier.orcid0000-0001-9495-0813
person.identifier.orcid0000-0003-2090-6291
person.identifier.ridC-6743-2012
person.identifier.ridE-9709-2013
person.identifier.scopus-author-id37016980900
person.identifier.scopus-author-id16044078400
person.identifier.scopus-author-id56260567900
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameEuropean Commission
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
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