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dc.rights.licenseopenen_US
dc.contributor.authorDIAZ, Melanie
dc.contributor.authorGRASSO, Florent
dc.contributor.authorLE HIR, Pierre
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSOTTOLICHIO, Aldo
IDREF: 158099699
dc.contributor.authorCAILLAUD, Matthieu
dc.contributor.authorTHOUVENIN, Benedicte
dc.date.accessioned2024-03-27T09:18:09Z
dc.date.available2024-03-27T09:18:09Z
dc.date.issued2020-04
dc.identifier.issn2169-9275en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188999
dc.description.abstractEnCoastal environments are directly influenced by terrigenous inputs coming from rivers through estuaries. Quantifying the amount of nutrients and contaminants transported by sediments from continental areas to the sea is crucial for marine resources protection. However, the complexity of estuarine dynamics makes it difficult to quantify sediment fluxes from field measurements alone and requires numerical modeling. Thus, using a realistic 3D hydrodynamic and sediment transport model, this study aims at evaluating the influence of model empirical parameters on sediment fluxes and estimating uncertainties on mud and sand transfers at a macrotidal estuary mouth. A sensitivity analysis, considering changes in sediment transport parameters, revealed that the system is not only sensitive to settling and erosion parameterizations, but also to the spin‐up period and the sediment sliding process. Both estuarine circulation and tidal pumping induce a residual up‐estuary transport, which is balanced by seaward export during spring tides. Although more fine sediments are exported within the surface turbid plume during high river discharge, the net mud transport is directed up‐estuary due to increased baroclinic circulation. Besides, model results highlighted a strong seasonal variability in sediment fluxes with a short and high import during high river flow and a long and weak export during low river flow. Uncertainties associated with the simulated fluxes were about 93% for mud and 51% for non‐cohesive classes, based on the best performing parameter sets for surface suspended sediment concentrations. These results can be reliably extrapolated to similar macrotidal estuarine systems.Plain language summaryEstuaries are transitional zones between terrestrial and marine environments (freshwater vs saltwater). Because of their potential to transport nutrients and contaminants, quantifying the amount of sediment particles (mud and sand) exchanged at this interfacial area is essential for marine resources protection. Here, we use a realistic numerical model of sediment transport applied to an estuary and its adjacent continental shelf. Some parameters in the model are not well‐known and require calibration. This study aims at evaluating the impact of various model calibrations on simulated sediment exchanges at the estuary mouth. We found that the simulated sediment behavior is very sensitive to the selected model parameters. The quantity and direction of simulated exchanges are influenced by the parameterization of sediment erosion and settling (i.e. the rate at which particles are suspended and settle out). The dominant physical processes driving these exchanges are strongly influenced by river flow and tide amplitude. Sediment transfers are very intense and directed upstream during a short period in winter and compensated by weak export seaward during a long period in summer. Besides, uncertainties associated with simulated sediment exchanges are about 93% for mud and 51% for sands, which can reliably be applied to similar estuarine systems.
dc.language.isoENen_US
dc.title.enModeling mud and sand transfers between a macrotidal estuary and the continental shelf: influence of the sediment-transport parameterization
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2019JC015643en_US
dc.subject.halPlanète et Univers [physics]en_US
bordeaux.journalJournal of Geophysical Research. Oceansen_US
bordeaux.pagee2019JC015643 (37p.)en_US
bordeaux.volume125en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue4en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamMETHYSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04202543
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_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=2020-04&rft.volume=125&rft.issue=4&rft.spage=e2019JC015643%20(37p.)&rft.epage=e2019JC015643%20(37p.)&rft.eissn=2169-9275&rft.issn=2169-9275&rft.au=DIAZ,%20Melanie&GRASSO,%20Florent&LE%20HIR,%20Pierre&SOTTOLICHIO,%20Aldo&CAILLAUD,%20Matthieu&rft.genre=article


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