Recent and old groundwater in the Niebla-Posadas regional aquifer (southern Spain): implications for its management

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dc.contributor.authorScheiber, Len_AU
dc.contributor.authorAyora, Cen_AU
dc.contributor.authorVazquez-Sune, Een_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorSoler, Aen_AU
dc.contributor.authorCustodio, Een_AU
dc.contributor.authorBaquero, JCen_AU
dc.date.accessioned2015-09-09T00:03:20Zen_AU
dc.date.available2015-09-09T00:03:20Zen_AU
dc.date.issued2015-04-01en_AU
dc.date.statistics2015-09-02en_AU
dc.description.abstractThe Niebla-Posadas (NP) aquifer in southern Spain is one of the main groundwater sources for the lower Guadalquivir Valley, a semiarid region supporting an important population, agriculture and industry. To contribute to the understanding of this aquifer the assessment of sustainable use of groundwater, the residence time of groundwater in the NP aquifer has been estimated using H-3, C-14 and Cl-36. Along the flow paths, recharged groundwater mixes with NaCl-type waters and undergoes calcite dissolution and is further modified by cation exchange (Ca-Na). Consequently, the water loses most of its calcium and the residual delta C-13(DIC) in the groundwater is isotopically enriched. Further modifications take place along the flow path in deeper zones, where depleted delta C-13(DIC) values are overprinted due to SC42- and iron oxide reduction, triggered by the presence of organic matter. Dating with H-3, C-14 and Cl-36 has allowed the differentiation of several zones: recharge zone (<0.06 ky), intermediate zone (0.06-20 ky), deep zone 1(20-30 ky), and deep zone 2 (>30 ky). An apparent link between the tectonic structure and the groundwater residence time zonation can be established. Regional faults clearly separates deep zone 1 from the distinctly older age (>30 ky) deep zone 2. From the estimated residence times, two groundwater areas of different behavior can be differentiated within the aquifer. © 2015, Elsevier B.V.en_AU
dc.identifier.citationScheiber, L., Ayora, C., Vazquez-Sune, E., Cendón, D. I., Soler, A., Custodio, E., & Baquero, J. C. (2015). Recent and old groundwater in the Niebla-Posadas regional aquifer (southern Spain): implications for its management. Journal of Hydrology, 523, 624-635. doi:10.1016/j.jhydrol.2015.01.076en_AU
dc.identifier.govdoc6012en_AU
dc.identifier.issn0022-1694en_AU
dc.identifier.journaltitleJournal of Hydrologyen_AU
dc.identifier.pagination624-635en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jhydrol.2015.01.076en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6180en_AU
dc.identifier.volume523en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science B.V.en_AU
dc.subjectTectonicsen_AU
dc.subjectAquifersen_AU
dc.subjectIsotopesen_AU
dc.subjectWateren_AU
dc.subjectCalciumen_AU
dc.subjectCarbon dioxideen_AU
dc.titleRecent and old groundwater in the Niebla-Posadas regional aquifer (southern Spain): implications for its managementen_AU
dc.typeJournal Articleen_AU
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