Identification of hydrogeochemical process linked to marine intrusion induced by pumping of a semiconfined Mediterranean coastal aquifer

Show simple item record Sola, F. Vallejos, A. Moreno Merino, Luis López Geta, Juan Antonio Pulido Bosch, A. 2020-11-26T12:58:57Z 2020-11-26T12:58:57Z 2012-07-18
dc.identifier.citation International Journal of Environmental Science and Technology, vol.10, 2013, 63–76 es_ES
dc.identifier.issn 1735-2630
dc.description.abstract This article analyses the hydrogeochemical processes, linked to the freshwater–seawater mixing zone, which can be caused by continuous pumping from a detrital coastal aquifer. It was necessary to construct an experimental plot, drilling three boreholes along a line perpendicular to the coast. A complete physico-chemical analysis was done of all water samples taken. The percentage of seawater, calculated from Chloride and 18Oxygen concentrations, varied between 55 and 90 %. The ionic deltas (Δ) calculated, and the saturation indices (SI) of mineral phases susceptible to precipitation or dissolution, allowed a series of hydrogeochemical processes to be identified that occur as a consequence of the advance of marine intrusion into the coastal band, and of aquifer flushing. Based on the major elements, the fraction of exchange (βI) was calculated for samples ranging from seawater to freshwater, and this revealed that differences in βI could explain the hydrochemistry of the mixing zone. The main processes recognised include precipitation of dolomite, dissolution of gypsum, fixation of sulphur salts and cation exchange. Most of the ion exchange took place between Na and Calcium + Magnesium ions. The process of fixation or liberation of these ions is probably determined by the advance or recession of the saline wedge, and/or by recharge during rainy periods. The behaviour of Magnesium is more sensitive to small variations in salinity, whilst Calcium behaves more homogeneously. The high percentage of seawater in the samples studied favours the speed and magnitude of processes such as ion exchange, and the intervention of magnesium is also a key. es_ES
dc.description.sponsorship Departamento de Hidrogeología, Universidad de Almería, España es_ES
dc.description.sponsorship Instituto Geológico y Minero de España, España es_ES
dc.language.iso en es_ES
dc.publisher Springer es_ES
dc.relation 017/SGTB/2007/2.1. es_ES
dc.relation CGL2007-63450/HID es_ES
dc.rights Otro es_ES
dc.subject groundwater–seawater relationship es_ES
dc.subject ionic exchange capacity es_ES
dc.subject stable isotopes es_ES
dc.subject water–rock interaction es_ES
dc.subject acuífero costero es_ES
dc.subject Región mediterránea es_ES
dc.title Identification of hydrogeochemical process linked to marine intrusion induced by pumping of a semiconfined Mediterranean coastal aquifer es_ES
dc.type Postprint es_ES
dc.relation.publisherversion es_ES
dc.description.funder Ministerio de Medio Ambiente, España es_ES
dc.description.funder Ministerio de Ciencia, España es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Mediterráneo es_ES

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


My Account