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The effects of high river discharges on the morphodynamics of the Guadiana ebb-tidal delta

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dc.contributor.authorLopez-Ruiz, Alejandro
dc.contributor.authorGarel, Erwan
dc.contributor.authorFerreira, Oscar
dc.date.accessioned2021-06-24T11:36:06Z
dc.date.available2021-06-24T11:36:06Z
dc.date.issued2020
dc.description.abstractThis work analyses the role of high river discharges upon the morphodynamics of an ebb-tidal delta at a jettied inlet (the Guadiana river mouth, at the southern border between Portugal and Spain). The analysis is performed using a numerical model to simulate the effects of synthetic single high river discharge events with return periods ranging from 3 to 670 years. This model was calibrated and validated both for hydro- and morphodynamics. Results show that the area with mobile sediment over the delta varies strongly with the magnitude of the river discharge. Events peaking over 7,500 m(3)/s produce significant bathymetric variations at the delta, including scouring of the inlet channel, along with the offshore migration and volumetric growth of the outer shoal. Observations have indicated that the delta does not recover from these sudden morphological changes. However, the recent strong river flow regulation by dams has limited the maximum river discharges to 2,500 m(3)/s. Such vanishing of unusually high discharge events has affected both the short-term and long-term morphodynamics of the Guadiana ebb-tidal delta.
dc.description.sponsorshipSpanish Ministry of Science, Innovation and Universities [CTM201789531-R, 917PTE0538]
dc.description.sponsorshipFCTPortuguese Foundation for Science and TechnologyEuropean Commission [IF/00661/2014/CP1234, UID/MAR/00350/2013]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.2112/SI95-109.1
dc.identifier.issn0749-0208
dc.identifier.urihttp://hdl.handle.net/10400.1/16631
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCoastal Education and Research Foundation (CERF)
dc.subjectChannel scouring
dc.subjectRiver regulation
dc.subjectHuman interventions
dc.subjectNumerical model
dc.titleThe effects of high river discharges on the morphodynamics of the Guadiana ebb-tidal delta
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F00350%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/IF%2F00661%2F2014%2FCP1234%2FCT0001/PT
oaire.citation.endPage562
oaire.citation.startPage558
oaire.citation.titleJournal of Coastal Research
oaire.fundingStream5876
oaire.fundingStream6817 - DCRRNI ID
person.familyNameGarel
person.familyNameFerreira
person.givenNameErwan
person.givenNameÓscar
person.identifier.ciencia-id5D13-7EA7-6C6D
person.identifier.ciencia-id1F1C-DF44-94C9
person.identifier.orcid0000-0002-4584-9759
person.identifier.orcid0000-0001-9975-0036
person.identifier.ridN-9811-2014
person.identifier.scopus-author-id23491739700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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