A conceptual model for groundwater flow and geochemical evolution in the southern Outaouais Region, Québec, Canada

DC FieldValueLanguage
dc.contributor.authorMontcoudiol, Nelly-
dc.contributor.authorMolson, John-
dc.contributor.authorLemieux, Jean-Michel-
dc.contributor.authorCloutier, Vincent-
dc.coverage.spatialOutaouais (Québec)fr
dc.description.abstractA conceptual model was developed for a hydrogeological flow system in the southern Outaouais Region, Quebec, Canada, where the local population relies heavily on groundwater pumped from shallow overburden aquifers and from deeper fractured crystalline bedrock. The model is based on the interpretation of aqueous inorganic geochemical data from 14 wells along a cross-section following the general flow direction, of which 9 were also analysed for isotopes (d18O, d2 H, 3 H, d13C, 14C) and 4 for noble gases (He, Ne, Ar, Xe, Kr). Three major water types were identified: (1) Ca–HCO3 in the unconfined aquifer as a result of silicate (Ca-feldspar) weathering, (2) Na–Cl as a remnant of the post-glacial Champlain Sea in stagnant confined zones of the aquifer, and (3) Na–HCO3, resulting from freshening of the confined aquifer due to Ca–Na cation exchange. Chemical data also allowed the identification of significant mixing zones. Isotope and noble gas data confirm the hypothesis of remnant water from the Champlain Sea and also support the hypothesis of mixing processes between a young tritium-rich component with an older component containing high 4 He concentrations. It is still unclear if the mixing occurs under natural flow conditions or if it is induced by pumping during the sampling, most wells being open boreholes in the bedrock. It is clear, however, that the hydrogeochemical system is dynamic and still evolving from induced changes since the last glaciation. As a next step, the conceptual model will serve as a basis for groundwater flow, mass transport and geochemical modelling to validate the hypotheses developed in this paper.fr
dc.titleA conceptual model for groundwater flow and geochemical evolution in the southern Outaouais Region, Québec, Canadafr
dc.typeCOAR1_1::Texte::Périodique::Revue::Contribution à un journal::Article::Article de recherchefr
dcterms.bibliographicCitationApplied Geochemistry, Vol. 58, 62–77 (2015)fr
dc.subject.rvmEau souterraine -- Écoulementfr
dc.subject.rvmGéochimie de l'environnementfr
rioxxterms.versionVersion of Recordfr
rioxxterms.project.funder_nameQuebec Ministry of Sustainable Development, Environment, Wildlife and Parks (MDDEFP)fr
rioxxterms.project.funder_nameAgence de Traitement de l’Information Numérique de l’Outaouais (L’ATINO)fr
rioxxterms.project.funder_nameWESA Enviro-Eaufr
rioxxterms.project.funder_nameNatural Sciences and Engineering Research Council of Canadafr
rioxxterms.project.funder_nameCanada Research Chair in Hydrogeology of Fractured Porous Mediafr
rioxxterms.project.funder_nameMRC des Collines-de-l'Outaouaisfr
rioxxterms.project.funder_nameMRC de La Vallée-de-la-Gatineaufr
rioxxterms.project.funder_nameMRC de Pontiacfr
rioxxterms.project.funder_nameMRC de Papineaufr
rioxxterms.project.funder_nameVille de Gatineaufr
rioxxterms.project.funder_nameABV des 7 - Agence Bassin Versant des 7fr
rioxxterms.project.funder_nameCOBALI - Comité du bassin versant de la rivière du Lièvrefr
rioxxterms.project.funder_nameOBV RPNS - Organisme de bassins versants des rivières Rouge, Petite Nation et Saumonfr
rioxxterms.project.funder_nameCREDDO - Conseil régional de l'environnement et du développement durable de l'Outaouaisfr
rioxxterms.project.funder_nameCRÉ-O - Conférence régionale des élus de l'Outaouaisfr
Collection:Articles publiés dans des revues avec comité de lecture

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