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Author |
Russak, A.; Sivan, O.; Yechieli, Y. |
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Title |
Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers |
Type |
Journal Article |
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Year |
2016 |
Publication |
Chemical Geology |
Abbreviated Journal |
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Volume |
441 |
Issue |
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Pages |
35-46 |
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Keywords |
Seawater intrusion, Fresh-saline water interface, Trace metal, Manganese, Lithium, Boron |
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Abstract |
The current global intrusion of seawater into coastal aquifers causes salinization of groundwater and thus significant degradation of its quality. This study quantified the effect of seawater intrusion and freshening events in coastal aquifers on trace elements (Li, B, Mn and Ba) across the fresh-saline water interface (FSI) and their possible use as indicators for these events. This was done by combining field data and column experiments simulating these events. The experiments enabled quantification of the processes affecting the trace element composition and examination of whether salinization and freshening events are geochemically reversible, which has been seldom investigated. The dominant process affecting trace element composition during salinization and freshening is ion exchange. The results of the experiments show that the concentrations of major cations and Li+ were reversible during salinization and freshening, whereas B, Mn2+ and Ba2+ were not. During salinization, Li+ and B were depleted due to sorption by 10 and 100μmol·L−1, respectively, to about half of their expected conservative concentrations. The relative depletion of Li+ increased with distance from the shore, representing the propagation of salinization. Ba2+ and Mn2+ were desorbed from the sediment during salinization and enriched by tenfold in the aqueous phase compared to their concentration in seawater ( 0.1 μeq·L−1). During freshening both were depleted by almost tenfold compared to their concentration in fresh groundwater ( 0.7 μeq·L−1). The depletion of Mn2+ is a sensitive marker for freshening because Mn2+ has a strong affinity to the solid phase. Moreover, this study shows that both Mn2+ and Ba2+ can be used as sensitive hydrogeochemical tools to distinguish between salinization and freshening events in the FSI zone in coastal aquifers. |
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en |
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0009-2541 |
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no |
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THL @ christoph.kuells @ Russak201635 |
Serial |
197 |
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Author |
Jesús Carrera, Juan J. Hidalgo, Luit J. Slooten, Enric Vázquez-Suñé |
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Title |
Computational and conceptual issues in the calibration of seawater intrusion models |
Type |
Journal Article |
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Year |
2010 |
Publication |
Hydrogeology Journal |
Abbreviated Journal |
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Volume |
18 |
Issue |
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Pages |
131-145 |
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Keywords |
Coastal aquifers; Inverse modelling; Numerical modeling |
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Abstract |
The inverse problem of seawater intrusion(SWI) is reviewed. It represents a challenge because of both conceptual and computational difficulties and because coastal aquifer models display many singularities:(1) head measurements need to be complemented with density information; (2) salinity concentration data are
very sensitive to flow within the borehole. Data problems can be reduced by incorporating the measurement process within model calibration; (3) SWI models are extremely sensitive to aquifer bottom topography; (4) the initial conditions may be far from steady state and depend on the location and type of sea-aquifer connection. Problems with aquifer geometry and initial conditions can be addressed by parameterization, which allows for modification during inversion. The four sets of difficulties can be partly overcome by using tidal response and electrical conductivity data, which are highly informative and
provide extensive coverage. Still, SWI inversion is extremely demanding from a computation point of view. Computational improvements are discussed. |
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Address |
J. Carrera : J. J. Hidalgo ()) : L. J. Slooten : E. Vázquez-Suñé, Spain e-mail: juan.hidalgo@upc.edu |
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Corporate Author |
Institute of Environmental Ass Institute of Environmental Assessment and Water Research (IDAEA), Spanish National Research Council (CSIC), Jordi Girona 18, 08034 Barcelona, e-mail: juan.hidalgo@upc.edu |
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Publisher |
IAH |
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Springer |
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English |
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1431- 2174 (online: 1435-0157) |
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'Hydrogeology'; 'groundwater modelling' |
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yes |
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Call Number |
MGRE @ redha.menani @ |
Serial |
51 |
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Author |
Zhou, X.; Li, C. |
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Title |
Hydrogeochemistry of deep formation brines in the central Sichuan Basin, China |
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Journal Article |
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Year |
1992 |
Publication |
Journal of Hydrology |
Abbreviated Journal |
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138 |
Issue |
1 |
Pages |
1-15 |
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Abstract |
Subsurface brines are abundant in the Sichuan Basin, China. Five brine-bearing aquifers have been identified within rocks of Triassic age in the central part of the basin. These are of two types: brine-bearing clastic and brine-bearing carbonate aquifers. Brines in this region have high total dissolved solids and chemical species that are different from those of evaporatively concentrated seawater. Deep formation brines in clastic aquifers, in which evaporites do not exist, are characterized by high concentrations of Ca, Sr, Ba, Br and I, low concentrations of Mg and K, and lack of SO4, and are dominated by the NaCaCl type. Brines in carbonate aquifers, which have interbeds of evaporites, are characterized by high total dissolved solids, low concentrations of Ca, Mg and SO4, and lack of Ba, and are of the NaCl type. The brines in clastic aquifers originate from connate continental sedimentary waters mixed with marine waters; membrane filtration through shales has played an important part in modifying the chemical compositions and increasing the salinity of the brines. Those in carbonate aquifers are bittern marine sedimentary waters, with chemical compositions mainly controlled by precipitation of evaporites. |
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ISSN |
0022-1694 |
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Area |
Asia |
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no |
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Call Number |
THL @ christoph.kuells @ Zhou19921 |
Serial |
41 |
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Author |
Panagopoulos, G. |
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Title |
Application of major and trace elements as well as boron isotopes for tracing hydrochemical processes: the case of Trifilia coastal karst aquifer, Greece |
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Journal Article |
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Year |
2009 |
Publication |
Environmental Geology |
Abbreviated Journal |
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Volume |
58 |
Issue |
5 |
Pages |
1067-1082 |
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ISSN |
0943-0105 |
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Area |
Greece |
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Call Number |
THL @ christoph.kuells @ Panagopoulos2009 |
Serial |
36 |
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Author |
Siarkos, I.; Latinopoulos, P. |
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Title |
Modeling seawater intrusion in overexploited aquifers in the absence of sufficient data: application to the aquifer of Nea Moudania, northern Greece |
Type |
Journal Article |
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Year |
2016 |
Publication |
Hydrogeology Journal |
Abbreviated Journal |
Hydrogeology J. |
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Volume |
24 |
Issue |
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Pages |
2123–2141 |
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Keywords |
Groundwater flow, Seawater intrusion, Numerical modeling, Greece, Sensitivity analysis |
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Abstract |
In many coastal areas, overexploitation of groundwater resources has led both to the quantitative degradation of local aquifers and the deterioration of groundwater quality due to seawater intrusion. To investigate the behavior of coastal aquifers under these conditions, numerical modeling is usually implemented; however, the proper implementation of numerical models requires a large amount of data, which are often not available due to the time-consuming and costly process of obtaining them. In the present study, the investigation of the behavior of coastal aquifers under the lack of adequate data is
attempted by developing a methodological framework consisting of a series of numerical simulations: a steady-state, a false-transient and a transient simulation. The sequence and the connection between these simulations constitute the backbone of the whole procedure aimed at adjusting the various
model parameters, as well as obtaining the initial conditions for the transient simulation. The validity of the proposed methodology is tested through evaluation of the model calibration procedure and the estimation of the simulation errors (mean error, mean absolute error, root mean square error, mean relative error) using the case of Nea Moudania basin, northern Greece. Furthermore, a sensitivity analysis is performed in order to minimize the error estimates and thus to maximize the reliability of the models. The results of the whole procedure affirm the proper implementation of the developed methodology under specific conditions and assumptions due to the lack of sufficient data, while they give a clear picture of the aquifer’s quantitative and qualitative status. |
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Address |
Ilias Siarkos: isiarkos@civil.auth.gr; Pericles Latinopoulos latin@civil.auth.gr |
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Corporate Author |
School of Civil Engineering, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece |
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Publisher |
IAH |
Place of Publication |
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Springer |
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English |
Summary Language |
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ISSN |
1431-2174 |
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Area |
Hydrogeology; groundwater modelling, sea water intrusion |
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Approved |
yes |
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Call Number |
MGRE @ redha.menani @ |
Serial |
52 |
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