Artículo
Residence time distribution in a large unconfined–semiconfined aquifer in the Argentine Pampas using 3H/3He and CFC tracer
Título:
Distribution des temps de résidence dans un large aquifère libre et semi-captif de la Pampa argentine par l’utilisation des traceurs 3H/3He et CFC;
Distribuição do tempo de residência em um grande aquífero livre–semiconfinado nos Pampas Argentinos usando traçadores 3H/3He e CFC;
Distribución de tiempos de residencia en un gran acuífero no confinado–semiconfinado usando trazadores de 3H/ He y CFC en la región Pampeana de Argentina
Distribuição do tempo de residência em um grande aquífero livre–semiconfinado nos Pampas Argentinos usando traçadores 3H/3He e CFC;
Distribución de tiempos de residencia en un gran acuífero no confinado–semiconfinado usando trazadores de 3H/ He y CFC en la región Pampeana de Argentina
Martinez, Daniel Emilio
; Fourré, E.; Quiroz Londoño, Orlando Mauricio
; Jean Baptiste, P.; Glok Galli, Melisa
; Dapoigny, A.; Grondona, Sebastian
Fecha de publicación:
08/2016
Editorial:
Springer
Revista:
Hydrogeology Journal
ISSN:
1431-2174
Idioma:
Español
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The Pampa region in Argentina includes vast unconfined–semiconfined aquifers that local economies depend upon, but detailed knowledge of the associated water resources is still lacking. The Pampeano aquifer in the Pampa plain of Argentina covers around 1.5 million km2. In order to achieve a better understanding of the hydrogeological system through the estimation of mean residence times (MRT), water samples were taken from 12 monitoring wells, drilled at different depths in four locations, and analyzed for environmental tracers. The concentrations of 3H, tritiogenic 3He and chlorofluorocarbons (CFCs) can be explained by mixtures of young waters adjusted to exponential piston flow models (EPM) or dispersion models (DM), and different proportions of tracer-free waters (dead water). The sampling site located very close to the water divide shows a dominance of young waters: 85 % of water best represented by a DM model with a MRT of 3 years. For the shallow wells at other sites, best-fitting models result in a DM with MRT between 20 and 35 years, and proportions of dead water between 40 and 60 %. These results lead to important updates in the conceptual model of the Pampeano aquifer. Large proportions of dead water at a few meters depth can be the consequence of upward flows in a multilayered aquifer or diffusive retardation in the inter-bedded clay layers.
Palabras clave:
3h/3he
,
Argentina
,
Chlorofluorocarbons (Cfc)
,
Flow Model
,
Groundwater Age
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Colecciones
Articulos(CIFICEN)
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos(IIMYC)
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Citación
Martinez, Daniel Emilio; Fourré, E.; Quiroz Londoño, Orlando Mauricio; Jean Baptiste, P.; Glok Galli, Melisa; et al.; Residence time distribution in a large unconfined–semiconfined aquifer in the Argentine Pampas using 3H/3He and CFC tracer; Springer; Hydrogeology Journal; 24; 5; 8-2016; 1107-1120
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