Back to Search
Start Over
Recent and old groundwater in the Niebla-Posadas regional aquifer (southern Spain): Implications for its management
- Source :
- Dipòsit Digital de la UB, Universidad de Barcelona
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- The 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 3H, 14C and 36Cl. 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 d13CDIC in the groundwater is isotopically enriched. Further modifications take place along the flow path in deeper zones, where depleted d13CDIC values are overprinted due to SO42 and iron oxide reduction, triggered by the presence of organic matter. Dating with 3H, 14C and 36Cl has allowed the differentiation of several zones: recharge zone (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.
- Subjects :
- Groundwater hydrology
Hydrology
geography
education.field_of_study
geography.geographical_feature_category
Groundwater flow
Artesian aquifer
Population
Aquifer
Groundwater recharge
Isòtops estables en ecologia
Hidrologia d'aigües subterrànies
Aquifers
Aqüífers
Environmental isotopes
Groundwater discharge
Stable isotopes in ecological research
education
Groundwater
Geology
Water Science and Technology
Subjects
Details
- ISSN :
- 00221694
- Volume :
- 523
- Database :
- OpenAIRE
- Journal :
- Journal of Hydrology
- Accession number :
- edsair.doi.dedup.....c04f4b9186f3a8ffc482c72c35344801