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Tracing sources and fate of nitrate in multilayered karstic hydrogeological catchments using natural stable isotopic composition (δ15N-NO3− and δ18O-NO3−). Application to the Toulon karst system (Dordogne, France)

dc.rights.licenseopenen_US
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorLORETTE, Guillaume
dc.contributor.authorSEBILO, Mathieu
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorBUQUET, Damien
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorLASTENNET, Roland
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorDENIS, Alain
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorPEYRAUBE, Nicolas
dc.contributor.authorCHARRIERE, Veronique
dc.contributor.authorSTUDER, Jean-Christophe
dc.date.accessioned2023-02-06T10:05:32Z
dc.date.available2023-02-06T10:05:32Z
dc.date.issued2022-07-01
dc.identifier.issn0022-1694en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/171869
dc.description.abstractEnIn groundwater management, the determination of the origins of nitrate (NO3–) endmember sources is the first step in improving the management over a hydrogeological catchment. The generally multiple source contamination by nitrate over the karst systems makes it difficult to identify the exact nitrate origins in surface water and groundwater. This work aims to assess nitrate vulnerability of a karst system fed by several karst aquifers. The Toulon karst system offers the opportunity to study the relationships between two multilayered karst aquifers. It shows an increase in mean NO3– concentrations over decades. However, the origins of the NO3– remain unclear. Natural stable isotopic composition of NO3– (δ15N-NO3– and δ18O-NO3–) measurements combined with concentrations were used to identify the origins of nitrogen causing this increase. This information was also integrated into the local hydrogeological situation to improve knowledge of the contamination of both confined and unconfined karst aquifers. δ15N-NO3− and δ18O-NO3− in potential nitrate sources over the hydrogeological catchment were analysed in order to identify the range of values that can be measured in both rivers and groundwater. Over the Toulon Springs catchment, rivers are contaminated with nitrate coming from N synthetic fertilizer mineralized in agriculturalsoils. Most of the springs are also contaminated by this nitrate source, but some record an isotope composition of nitrate coming from sewage effluents. Toulon Springs are only contaminated with nitrate from N synthetic fertilizer mineralized in agricultural soils. Finally, from a hydrogeological point of view, the analysis of δ15N-NO3− and δ18O-NO3− values improves knowledge on the functioning of the study area and shows that the upper Jurassic karst confined aquifer has nitrate of the same origins (sources) as the upper Cretaceous unconfined aquifer. The results here highlight that the lower aquifer can be fed by the Upper Cretaceous unconfined aquifer, contrary to previous belief that the lower aquifer was confined. From a more fundamental standpoint, this work provides a set of parameters adapted for karstic hydrogeological catchment. It lays the foundation for the use of isotope biogeochemistry as a powerful tool for understanding the recharge of drinking water catchments and beyond the efficient management of water quality at the scale of karstic hydrogeological catchment.
dc.language.isoENen_US
dc.subject.enHydrochemistry
dc.subject.enKarst
dc.subject.enMultilayered aquifer
dc.subject.enNitrate
dc.subject.enNitrate isotopes
dc.title.enTracing sources and fate of nitrate in multilayered karstic hydrogeological catchments using natural stable isotopic composition (δ15N-NO3− and δ18O-NO3−). Application to the Toulon karst system (Dordogne, France)
dc.title.alternativeJournal of Hydrologyen_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.jhydrol.2022.127972en_US
dc.subject.halSciences de l'ingénieur [physics]/Matériauxen_US
bordeaux.journalJournal of Hydrologyen_US
bordeaux.volume610en_US
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionBordeaux INPen_US
bordeaux.institutionCNRSen_US
bordeaux.institutionINRAEen_US
bordeaux.institutionArts et Métiersen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-03974793
hal.version1
hal.date.transferred2023-02-06T10:05:34Z
hal.exporttrue
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%20Hydrology&rft.date=2022-07-01&rft.volume=610&rft.eissn=0022-1694&rft.issn=0022-1694&rft.au=LORETTE,%20Guillaume&SEBILO,%20Mathieu&BUQUET,%20Damien&LASTENNET,%20Roland&DENIS,%20Alain&rft.genre=article


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