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Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge

2021-11Journal article Open access
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dc.contributor.authorGarel, Erwan
dc.contributor.authorZhang, Ping
dc.contributor.authorCai, Huayang
dc.date.accessioned2021-11-22T15:33:35Z
dc.date.available2021-11-22T15:33:35Z
dc.date.issued2021-11
dc.description.abstractObservations indicate that the fortnightly fluctuations in mean water level increase in amplitude along the lower half of a tide-dominated estuary (The Guadiana estuary) with negligible river discharge but remain constant upstream. Analytical solutions reproducing the semi-diurnal wave propagation shows that this pattern results from reflection effects at the estuary head. The phase difference between velocity and elevation increases from the mouth to the head (where the wave has a standing nature) as the high and low water levels get progressively closer to slack water. Thus, the tidal (flood-ebb) asymmetry in discharge is reduced in the upstream direction. It becomes negligible along the upper estuary half, as the mean sea level remains constant despite increased friction due to wave shoaling. Observations of a flat mean water level along a significant portion of an upper estuary, easier to obtain than the phase difference, can therefore indicate significant reflection of the propagating semi-diurnal wave at the head. Details of the analytical model shows that changes in the mean depth or length of semi-arid estuaries, in particular for macrotidal locations, affect the fortnightly tide amplitude, and thus the upstream mass transport and inundation regime. This has significant potential impacts on the estuarine environment.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/os-17-1605-2021pt_PT
dc.identifier.eissn1812-0792
dc.identifier.urihttp://hdl.handle.net/10400.1/17336
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCopernicus Gesellschsft MBHpt_PT
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectEstuário semiáridopt_PT
dc.subjectVariabilidade subtidalpt_PT
dc.subjectPropagação de ondaspt_PT
dc.subjectNão estacionáriopt_PT
dc.subjectFluirpt_PT
dc.subjectExploraçãopt_PT
dc.subjectSedimentopt_PT
dc.subjectFricçãopt_PT
dc.subjectComportamentopt_PT
dc.subjectSistemaspt_PT
dc.titleDynamics of fortnightly water level variations along a tide-dominated estuary with negligible river dischargept_PT
dc.title.alternativeDinâmica de variações quinzenais do nível da água ao longo de um estuário dominado pela maré com descarga de rio insignificantept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00350%2F2020/PT
oaire.citation.endPage1621pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage1605pt_PT
oaire.citation.titleOcean Sciencept_PT
oaire.citation.volume17pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameGarel
person.givenNameErwan
person.identifier.ciencia-id5D13-7EA7-6C6D
person.identifier.orcid0000-0002-4584-9759
person.identifier.ridN-9811-2014
person.identifier.scopus-author-id23491739700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7e619cba-3bfb-4964-bdf3-b8afd91a4a29
relation.isAuthorOfPublication.latestForDiscovery7e619cba-3bfb-4964-bdf3-b8afd91a4a29
relation.isProjectOfPublication607b395b-b4ff-4b27-b6e4-779cdea78d97
relation.isProjectOfPublication.latestForDiscovery607b395b-b4ff-4b27-b6e4-779cdea78d97

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