Hydrogeochemical processes in the vicinity of a desalination plant (Cabo de Gata, SE Spain)

Linda Daniele, Angela Vallejos, Fernando Sola, Mercé Corbella, Antonio Pulido-Bosch

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

This study provides geochemical data with the aim of assisting in the proper managing of groundwater resources and so avoiding negative impacts on the aquifers. The area covers the coastal aquifer of Cabo de Gata, which supplies a new desalination plant. Groundwater samples, to different depths, were characterized to identify the main processes occurring in the system, as well as to establish their relationship with seawater. Major and minor elements, and their ionic ratios distinguish two groups of samples: G1) samples containing between 7 and 70% seawater, with SO 42- /Cl - and Br/Cl - ratios that decrease with salinity; G2) water containing between 99 and 112% of seawater, SO 42- /Cl - similar to that of seawater (0.12) and a Br/Cl - ratio that increases with salinity. Different scenarios were simulated using PHREEQC geochemical code: a) conservative seawater-freshwater mixing, b) modified freshwater-seawater mixing, c) freshwater-modified seawater mixing and d) modified freshwater-modified seawater mixing. Modeling results indicate that the processes that best match the groundwater samples are different for the two groups identified. Water in group 1 is best simulated by a mix of modified freshwater (by water-rock interaction processes) with seawater, and group 2 by mixing a modified (evaporated) seawater with freshwater. © 2011 Elsevier B.V.
Original languageEnglish
Pages (from-to)338-347
JournalDesalination
Volume277
Issue number1-3
DOIs
Publication statusPublished - 15 Aug 2011

Keywords

  • Coastal aquifer
  • Groundwater-seawater relationship
  • PHREEQC

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