Isotopic composition (delta18O and deltaD) of precipitation and groundwater in a semi-arid, mountainous area (Guadiana Menor basin, Southeast Spain)

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dc.contributor.author Fernández Chacón, Francisca
dc.contributor.author Benavente Herrera, José
dc.contributor.author Rubio Campos, Juan Carlos
dc.contributor.author Kohfahl, Claus Reimer
dc.contributor.author Jiménez, J.
dc.contributor.author Meyer, Hanno
dc.contributor.author Hubberten, Hans Wolfgang
dc.contributor.author Pekdeger, Asaf
dc.date.accessioned 2020-12-01T05:55:34Z
dc.date.available 2020-12-01T05:55:34Z
dc.date.issued 2010-02-17
dc.identifier.citation Hydrological processes (2010), v.24,, n.10, p.1343-1356 es_ES
dc.identifier.issn 0885-6087
dc.identifier.uri http://hdl.handle.net/20.500.12468/644
dc.description.abstract We characterize the precipitation and groundwater in a mountainous (peaks slightly above 3000 m a.s.l.), semi-arid river basin in SE Spain in terms of the isotopes 18O and 2H. This basin, with an extension of about 7000 km2, is an ideal site for such a study because fronts from the Atlantic and the Mediterranean converge here. Much of the land is farmed and irrigated both by groundwater and runoff water collected in reservoirs. A total of approximately 100 water samples from precipitation and 300 from groundwater have been analysed. To sample precipitation we set up a network of 39 stations at different altitudes (800–1700 m a.s.l.), with which we were able to collect the rain and snowfall from 29 separate events between July 2005 and April 2007 and take monthly samples during the periods of maximum recharge of the aquifers. To characterize the groundwater we set up a control network of 43 points (23 springs and 20 wells) to sample every 3 months the main aquifers and both the thermal and non-thermal groundwater. We also sampled two shallow-water sites (a reservoir and a river). The isotope composition of the precipitation forms a local meteoric water line (LMWL) characterized by the equation υD D 7Ð72υ18O C 9Ð90, with mean values for υ18O and υD of 10Ð28‰ and 69Ð33‰, respectively, and 12Ð9‰ for the d-excess value. To correlate the isotope composition of the rainfall water with groundwater we calculated the weighted local meteoric water line (WLMWL), characterized by the equation υD D 7Ð40υ18O C 7Ð24, which takes into account the quantity of water precipitated during each event. These values of (dυD/dυ18O)<8 and d-excess (υD–8υ18O)<10 in each curve bear witness to the ‘amount effect’, an effect which is more manifest between May and September, when the ground temperature is higher. Other effects noted in the basin were those of altitude and the continental influence. The isotopic compositions of the groundwater are represented by the equation υD D 4Ð79υ18O 18Ð64. The groundwater is richer in heavy isotopes than the rainfall, with mean values of 8Ð48‰ for υ18O and 59Ð27‰ for υD. The isotope enrichment processes detected include a higher rate of evaporation from detrital aquifers than from carbonate ones, the effects of recharging aquifers from irrigation return flow and/or from reservoirs’ leakage and enrichment in υ18O from thermal water es_ES
dc.description.sponsorship Instituto del Agua, Universidad de Granada, España es_ES
dc.description.sponsorship Oficina de Granada, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Institute of Geological Sciences, Freie Universit¨at Berlin, Alemania es_ES
dc.description.sponsorship Alfred Wegener Institute, Alemania es_ES
dc.language.iso en es_ES
dc.publisher John Wiley & Sons es_ES
dc.rights Acceso abierto es_ES
dc.subject stable isotopes es_ES
dc.subject precipitation es_ES
dc.subject local meteoric water line es_ES
dc.subject groundwater es_ES
dc.subject Southeast Spain es_ES
dc.subject Cuenca Guadiana es_ES
dc.subject Andalucía es_ES
dc.title Isotopic composition (delta18O and deltaD) of precipitation and groundwater in a semi-arid, mountainous area (Guadiana Menor basin, Southeast Spain) es_ES
dc.type Postprint es_ES
dc.relation.publisherversion https://onlinelibrary.wiley.com/doi/10.1002/hyp.7597 es_ES
dc.description.funder Instituto Geológico y Minero de España, España es_ES
dc.identifier.doi https://doi.org/10.1002/hyp.7597 es_ES
dc.coverage.spatialStudy Cuenca Guadiana, Andalucía, España es_ES


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