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Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorJALON ROJAS, Isabel
ORCID: 0000-0003-4254-4084
IDREF: 160580730
hal.structure.identifierDelft University of Technology [TU Delft]
dc.contributor.authorDIJKSTRA, Y
hal.structure.identifierDelft University of Technology [TU Delft]
dc.contributor.authorSCHUTTELAARS, H
hal.structure.identifierDelft University of Technology [TU Delft]
dc.contributor.authorBROUWER, R
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSOTTOLICHIO, Aldo
IDREF: 158099699
dc.date.accessioned2024-02-14T14:27:56Z
dc.date.available2024-02-14T14:27:56Z
dc.date.issued2021
dc.identifier.issn2169-9275en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188137
dc.description.abstractEnClimate and human pressures can influence the evolution of estuarine sediment dynamics concurrently, but the understanding and quantification of their cause–effect relationships are still challenging due to the occurrence of complex hydro-morpho-sedimentary feedbacks. The Garonne Tidal River (GTR, upper Gironde Estuary, France) is a clear example of a system stressed by both anthropogenic and climate change, as it has been subject to decreasing river discharges, natural morphological changes, and gravel extraction. To understand the relative effect of each hydrological and geomorphological pressure on the turbidity maximum zone (TMZ), the sediment dynamics in the GTR over the last six decades was evaluated using the width-averaged idealized iFlow model. Model results show a gradual increase in tidal amplitude and currents over the decades that has led to the upstream shift of the landward sediment-transport capacity components (external M4 tide, spatial settling lag, and tidal return flow). The upstream displacement of the TMZ between the 1950s and the 2010s was estimated to be at least 19 km, of which about three fourth was induced by geomorphological changes and one fourth by hydrological changes. Concerning the geomorphological changes, the natural evolution of the lower Gironde morphology was the main pressure inducing the displacement of the TMZ in the GTR. Anthropogenic and natural changes in morphology and bed roughness in the GTR itself also contributed to this evolution. The natural geomorphological changes were, in turn, probably promoted by the evolution of sediment dynamics, so this study reveals the closed circle that governs the intensification of the TMZ.
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/
dc.title.enMultidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures
dc.title.alternativeJ. Geophys. Res. Oceansen_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2020jc016273en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géomorphologieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
bordeaux.journalJournal of Geophysical Research. Oceansen_US
bordeaux.pagee2020JC016273en_US
bordeaux.volume126en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue5en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamMETHYSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-03337078
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BY-NC-NDen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Geophysical%20Research.%20Oceans&rft.date=2021&rft.volume=126&rft.issue=5&rft.spage=e2020JC016273&rft.epage=e2020JC016273&rft.eissn=2169-9275&rft.issn=2169-9275&rft.au=JALON%20ROJAS,%20Isabel&DIJKSTRA,%20Y&SCHUTTELAARS,%20H&BROUWER,%20R&SCHMIDT,%20Sabine&rft.genre=article


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