Simple solutions for steady–state diffuse recharge evaluation in sloping homogeneous unconfined aquifers by means of atmospheric tracers

Custódio, Emílio; Jódar, Jorge

doi:10.1016/j.jhydrol.2016.06.035

Cited by 22 publications

(14 citation statements)

References 36 publications

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“…Water mixing is not produced inside the system but in the outflow, as in a spring discharging the full aquifer thickness or by pumping a fully penetrating, long-screened well. It can be easily demonstrated that the results from an exponential flow model coincide with those of a well-mixed reservoir when the saturated thickness is constant (Custodio and Jódar, 2016).…”

Section: Timing Of Aquifer Recharge: General Considerationsmentioning

confidence: 79%

“…For a well-mixed (exponential) reservoir containing a water depth H and receiving a spatially and temporally uniform recharge R with CR radioactive tracer concentration, the concentration of the outflow C, for a decay constant λ, can be deduced from a simple balance. The well-known result (see Custodio and Jódar, 2016 for explanation and references) is…”

Section: Timing Of Aquifer Recharge: General Considerationsmentioning

confidence: 93%

“…If C s is the measured chloride concentration in local groundwater, neglecting the slope effect (Custodio and Jódar, 2016) for a first approach of a proxy of recharge water, the long-term average diffuse recharge rate (R) is D/C s , as chloride exportation by surface runoff can be assumed small under existing environmental conditions. D is total atmospheric deposition rate of Cl.…”

Section: Groundwater Salinitymentioning

confidence: 99%

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Groundwater origin and recharge in the hyperarid Cordillera de la Costa, Atacama Desert, northern Chile

Herrera

Gamboa

Custódio

et al. 2018

Science of The Total Environment

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The Cordillera de la Costa is located along the coastline of northern Chile, in the hyperarid Atacama Desert area. Chemical and isotopic analyses of several small coastal springs and groundwater reservoirs between 22.5 °S and 25.5 °S allow understanding groundwater origin, renewal time and the probable timing of recharge. The aquifers are mostly in old volcanic rocks and alluvial deposits. All spring waters are brackish, of the sodium chloride type due to intensive concentration of precipitation due aridity and for deep groundwater to additional water-rock interaction in slowly renewed groundwater and mixing with deep seated brines. The heavy δO and δH values in spring water are explained by recharge by the arrival of moist air masses from the Pacific Ocean and the originally lighter values in the deep wells can be associated to past recharge by air masses coming from the Atlantic Ocean. Current recharge is assumed almost nil but it was significant in past wetter-than-present periods, increasing groundwater reserves, which are not yet exhausted. To explain the observed chloride content and radiocarbon (C) activity, a well-mixed (exponential) flow model has been considered for aquifer recharge. The average residence time of groundwater feeding the springs has been estimated between 1 and 2kyr, up to 5kyr and between 7 and 13kyr for deep well water, assuming that current recharge is much less than during the previous wetter period. The recharge period feeding the coastal springs could have been produced 1 to 5kyr BP, when the area was already inhabited, and recharge in the Michilla mine was produced during the 10 to 14.5kyr BP CAPE (Central Andean Pluvial Event) pluvial events of the central Andes. The approximate coincidence of turnover time with the past wet periods, as revealed by paleoclimate data, points to significant recharge during them.

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Section: Timing Of Aquifer Recharge: General Considerationsmentioning

confidence: 79%

Section: Timing Of Aquifer Recharge: General Considerationsmentioning

confidence: 93%

Section: Groundwater Salinitymentioning

confidence: 99%

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Groundwater origin and recharge in the hyperarid Cordillera de la Costa, Atacama Desert, northern Chile

Herrera

Gamboa

Custódio

et al. 2018

Science of The Total Environment

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“…Los valores obtenidos de los puntos de control que extraen del acuífero en los materiales terciarios en la Plana de la Galera es de δ 18 O = -6.5‰ a -7.5‰. Con base en estos resultados se establece la hipótesis de mezcla de agua subterránea de varias procedencias, asimilando el sistema a un modelo de recarga en ladera (Custodio 2010(Custodio , 2013 en el cual se produce recarga sobre la Plana de la Galera (R2) y también recarga (R1) en los Ports (Figura 5) que es transferida lateralmente a la Plana, en parte directamente y en parte a través de los materiales de piedemonte, donde se mezcla con la recarga R2.…”

Section: Funcionamiento Hidrodinámico Del Sistemaunclassified

“…Figura 7 | Esquema del modelo de mezcla de aguas subterráneas de distinto origen (Custodio, 2009;Custodio 2013) y formulación para la obtención de la recarga media anual suponiendo un flujo paralelo. C(x i ) = la concentración de ión cloruro en función de la distancia a la divisoria de aguas superficiales, x i : distancia desde la divisoria de aguas superficiales al punto de medición del cloruro de agua subterránea, D 1 y D 2 = deposición atmosférica de ión cloruro media para los Ports y para la Plana respectivamente, µ = distancia a la cual se encuentra el límite del sistema montañoso con el llano, R 1 = recarga media anual calculada con el balance de la deposición atmosférica de ión cloruro para los Ports y R 2 = recarga media anual para la Plana.…”

Section: Sub-zona Superficieunclassified

Comparación de la recarga natural estimada con el balance de agua en el suelo y con el balance de la deposición atmosférica de cloruro en un sistema carbonatado en el área semiárida del Baix Ebre, Cataluña, España.

2015

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Espinosa-Martínez et al. | Comparación de la recarga natural estimada con el balance de agua en el suelo y […] REsumEnSe realiza la estimación de la recarga media multianual con el método de balance de la deposición atmosférica de cloruro (BCl) y con el balance de agua en el suelo (BaS) en el área del Baix Ebre (Sur de Cataluña). Se trata de un sistema acuífero complejo formado por una cordillera carbonatada moderadamente lluviosa (los Ports) que transfiere agua a un llano semiárido (Plana de La Galera), según un modelo hidrogeológico conceptual de funcionamiento apoyado en técnicas hidrogeoquímicas e isotópicas ambientales y que considera la escorrentía superficial en la zona montañosa. Según el BCl la tasa media de recarga en los Ports de 340±155 mm a -1 en la Plana. Las diferencias dependen de cómo se considera la escorrentía superficial, de la concentración cloruro en la recarga y de las series de datos de precipitación.Palabras clave | Recarga; Deposición atmosférica de ión cloruro; Balance de agua en el suelo; Clima semiárido; Baix Ebre; Ports de Beseit-Plana de La Galera. ABsTRACT The estimation of long-term average recharge is performed with the balance of atmospheric chloride deposition (BCl) and the soil water balance (BaS) applied in the Baix Ebre area (Southern Catalonia

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Estimation of spatial distribution of groundwater recharge from stream baseflow and groundwater chloride

Niazi

Bentley

2017

Journal of Hydrology

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Simple solutions for steady–state diffuse recharge evaluation in sloping homogeneous unconfined aquifers by means of atmospheric tracers

Cited by 22 publications

References 36 publications

Groundwater origin and recharge in the hyperarid Cordillera de la Costa, Atacama Desert, northern Chile

Groundwater origin and recharge in the hyperarid Cordillera de la Costa, Atacama Desert, northern Chile

Comparación de la recarga natural estimada con el balance de agua en el suelo y con el balance de la deposición atmosférica de cloruro en un sistema carbonatado en el área semiárida del Baix Ebre, Cataluña, España.

Estimation of spatial distribution of groundwater recharge from stream baseflow and groundwater chloride

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