Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29176
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dc.contributor.authorMatias, Anaen_UK
dc.contributor.authorCarrasco, Ana Ren_UK
dc.contributor.authorLoureiro, Carlosen_UK
dc.contributor.authorAlmeida, Sílviaen_UK
dc.contributor.authorFerreira, Óscaren_UK
dc.date.accessioned2019-04-02T00:04:54Z-
dc.date.available2019-04-02T00:04:54Z-
dc.date.issued2014-04-28en_UK
dc.identifier.urihttp://hdl.handle.net/1893/29176-
dc.description.abstractAccurate prediction of the occurrence and morphological consequences of overwash are important for coastal flood risk assessment and management. A number of morphological and oceanographic factors controlling overwash have been identified by several authors, including nearshore bathymetry. This work intends to identify alongshore variations in storm impact and evaluate the role of sub-aerial and submerged morphological variations in overwash occurrence. For this study, 24 cross-shore topo-bathymetric profiles were set on Barreta Island (Ria Formosa barrier island system, Portugal), extending from the nearshore to the lagoon level on the island backbarrier. Pre- and post-overwash surveys were made between August 2012 and April 2013. Offshore wave characteristics were obtained during overwash events including offshore significant wave height (Hs), peak period and wave direction. Wave propagation and wave parameters at breaking were obtained from SWAN model simulations. During the study period, overwash occurred both under storm conditions (e.g., Hs = 3.8 m) and non-storm conditions (e.g., Hs = 0.8 m), the latter coincident with spring high-tide. Overwash water intrusion distance across the barrier varied alongshore between 0 m (no overwash) and 40 m (reaching lagoon waters). Beach morphology was spatially variable, and changeable from one overwash episode to the next. Important morphological variations of the barrier include modification of barrier crest elevation, beach slope, and presence of swash bars in the vicinity of Ancão Inlet. Predictions of overwash occurrence were made by means of the computation of the Overwash Potential (OP), defined as the difference between the wave runup and the barrier elevation. Several runup equations were tested, and the results of obtained OP were compared to the observations of actual overwash occurrence to determine the most reliable approach. The selected predictor provided an accuracy of 88% for the identification of the locations where overwash processes occurred along the barrier. The predictions were variable alongshore due to variations in breaking waves and beach slope, which in turn are related to the existence of nearshore bars, associated with the presence of the updrift Ancão Inlet. This study proves that nearshore and foreshore morphologies have a major impact on the longshore variation of overwash distribution.en_UK
dc.language.isoenen_UK
dc.publisherCoastal Education and Research Foundationen_UK
dc.relationMatias A, Carrasco AR, Loureiro C, Almeida S & Ferreira Ó (2014) Nearshore and foreshore influence on overwash of a barrier island. 13th International Coastal Symposium , Durban, South Africa. Journal of Coastal Research, (S1 70), pp. 675-680. https://doi.org/10.2112/si70-114.1en_UK
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.en_UK
dc.rights.urihttp://www.rioxx.net/licenses/under-embargo-all-rights-reserveden_UK
dc.subjectSWANen_UK
dc.subjectrunup predictoren_UK
dc.subjectbeachen_UK
dc.subjectstormen_UK
dc.subjectcoastal hazardsen_UK
dc.titleNearshore and foreshore influence on overwash of a barrier islanden_UK
dc.typeConference Paperen_UK
dc.rights.embargodate2999-12-31en_UK
dc.identifier.doi10.2112/si70-114.1en_UK
dc.citation.jtitleJournal of Coastal Researchen_UK
dc.citation.issn1551-5036en_UK
dc.citation.issn0749-0208en_UK
dc.citation.issueS1 70en_UK
dc.citation.spage675en_UK
dc.citation.epage680en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.author.emailcarlos.loureiro@stir.ac.uken_UK
dc.citation.conferencelocationDurban, South Africaen_UK
dc.citation.conferencename13th International Coastal Symposiumen_UK
dc.contributor.affiliationUniversity of Algarveen_UK
dc.contributor.affiliationUniversity of Algarveen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationUniversity of Algarveen_UK
dc.contributor.affiliationUniversity of Algarveen_UK
dc.identifier.scopusid2-s2.0-84946152995en_UK
dc.identifier.wtid1237683en_UK
dc.contributor.orcid0000-0003-3117-3492en_UK
dc.date.accepted2014-02-21en_UK
dcterms.dateAccepted2014-02-21en_UK
dc.date.filedepositdate2019-03-04en_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeConference Paper/Proceeding/Abstracten_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorMatias, Ana|en_UK
local.rioxx.authorCarrasco, Ana R|en_UK
local.rioxx.authorLoureiro, Carlos|0000-0003-3117-3492en_UK
local.rioxx.authorAlmeida, Sílvia|en_UK
local.rioxx.authorFerreira, Óscar|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2264-03-29en_UK
local.rioxx.licencehttp://www.rioxx.net/licenses/under-embargo-all-rights-reserved||en_UK
local.rioxx.filenameMatias_etal_2014_PublishedVersion.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source1551-5036en_UK
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