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Sivakumar*, B.; Harter, T.; Zhang, H. |
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A fractal investigation of solute travel time in a heterogeneous aquifer: transition probability/Markov chain representation |
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2005 |
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Ecol. Modell. |
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182 |
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355-370 |
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CUT @ phaedon.kyriakidis @ Sivakumar2005 |
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132 |
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Carrera*, J.; Alcolea, A.; Medina, A.; Hidalgo, J.; Slooten, L.J. |
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Title |
Inverse problem in hydrogeology |
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Journal Article |
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Year |
2005 |
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Hydrogeol. J. |
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13 |
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206-222 |
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CUT @ phaedon.kyriakidis @ Carrera2005 |
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146 |
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Faye, S.; Maloszewski, P.; Stichler, W.; Trimborn, P.; Faye, S. C.; Gaye, C. |
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Title |
Groundwater salinization in the Saloum (Senegal) delta aquifer: minor elements and isotopic indicators |
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Journal Article |
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2005 |
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Science of The Total Environment |
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343 |
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1 |
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243-259 |
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Minor elements, Hydrochemistry, Sorption/desorption, Mixing model, Salinization |
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The hydrochemistry of minor elements bromide (Br), boron (B), strontium (Sr), environmental stable isotopes (18O and 2H) together with major-ion chemistry (chloride, sodium, calcium) has been used to constrain the source(s), relative age, and processes of salinization in the Continental Terminal (CT) aquifer in the Saloum (mid-west Senegal) region. Seventy-one groundwater wells which include 24 wells contaminated by saltwater and three sites along the hypersaline Saloum River were sampled to obtain additional information on the hydrochemical characteristics of the groundwater defined in previous studies. Use of Br against Cl confirms the Saloum River saline water intrusion up to a contribution of 7% into the aquifer. In addition to this recent intrusion, a relatively ancient intrusion of the Saloum River water which had reached at least as far as 20 km south from the source was evidenced. The high molar ratio values of Sr/Cl and Sr/Ca indicate an additional input of strontium presumably derived from carbonate precipitation/dissolution reactions and also via adsorption reactions. The variable B concentrations (7–650 μg/L) found in the groundwater samples were tested against the binary mixing model to evaluate the processes of salinization which are responsible for the investigated system. Sorption of B and depletion of Na occur as the Saloum river water intrudes the aquifer (salinization) in the northern part of the region, whereas B desorption and Na enrichment occur as the fresh groundwater flushing displaces the saline waters in the coastal strip (refreshening). In the central zone where ancient intrusion prevailed, the process of freshening of the saline groundwater is indicated by the changes in major-ion chemistry as well as B desorption and Na enrichment. In addition to these processes, stable isotopes reveal that mixing with recently infiltrating waters and evaporation contribute to the changes in isotopic signature. |
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0048-9697 |
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THL @ christoph.kuells @ Faye2005243 |
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173 |
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Pulido-Leboeuf, P.; Pulido-Bosch, A.; Calvache, M.L.; Vallejos, Á.; Andreu, J.M. |
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Title |
Strontium, SO42-/Cl- and Mg2+/Ca2+ ratios as tracers for the evolution of seawater into coastal aquifers: the example of Castell de Ferro aquifer (SE Spain) |
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Journal Article |
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2003 |
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Comptes Rendus Geoscience |
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335 |
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14 |
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1039-1048 |
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Elsevier |
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THL @ luqianxue.zhang @ pulido2003strontium |
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71 |
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Araguás-Araguás, L. |
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Identification of the mechanisms and origin of salinization of groundwater in coastal aquifers by isotope techniques |
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2003 |
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Tecnología de la intrusión de agua de mar en acuíferos costeros, Países Mediterráneos |
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365-371 |
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When assessing the origin of salinity and the mechanisms of salinization in coastal aquifers, hydrogeologists may consider the combined use of certain geochemical tools to assess critical aspects of the hydrogeological setting of the system. These tools are based in the integrated use of chemical (major ions, trace elements and ionic ratios) and isotope parameters (oxygen, hydrogen, sulphur, carbon, strontium and boron). The problem of groundwater salinization in coastal aquifers, besides active seawater intrusion, may be affected by several human activities that accelerate the progressive deterioration of water quality, such as concentrated pumping, intensive agricultural practices including return flows or reuse of waste waters from urban or industrial origin. The characterisation of the perating processes and mechanisms of salinization is a requisite for a proper management of groundwater resources and for adopting remediation strategies. In this contribution the potential role of several isotopic tools in these studies is briefly described. |
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THL @ christoph.kuells @ article |
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86 |
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