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Abstract:

The origin of the high salinity in the groundwater of a coastal wetland in an arid climate was studied in the Playa Fracasso marsh, located on the northwest coast of the extra-Andean Patagonia. Research was carried out by means of the design of a network of soil pits and short piezometers in the marsh and the surrounding landforms. Continuous fluctuations of the water table, in situ physical and chemical properties, major ions (Ca 2+ , Mg 2+ , Na + , K + , Cl − , SO 4 2− , HCO 3 − ) and stable isotopes ( 18 O and 2 H) in groundwater, as well as soil salinity, were measured. The combined analysis of the hydrodynamics, the ion ratios rCa 2+ /rCl − and rMg 2+ /rCa 2+ vs. rCl − and the isotopic composition made it possible to recognize an area within the high marsh in which the origin of groundwater is mainly marine and another in which the contributions are of mixed origin. By means of the analysis of rCl − vs. δ 18 O, a salinization process with no change in isotopic composition was identified. Its interpretation, together with those of the soil salinity profiles and the records of the fluctuations in electrical conductivity associated with extraordinary tides, was used to define a conceptual model of salinization which could be useful to understand other coastal wetlands under similar arid climatic conditions. It consists in a cyclical mechanism of evapotranspiration, precipitation, dissolution and transport of salts during tides. © 2014, Springer-Verlag Berlin Heidelberg.

Registro:

Documento: Artículo
Título:Groundwater salinization in arid coastal wetlands: a study case from Playa Fracasso, Patagonia, Argentina
Autor:Alvarez, M.P.; Dapeña, C.; Bouza, P.J.; Ríos, I.; Hernández, M.A.
Filiación:Cátedra de Hidrogeología, Universidad Nacional de La Plata (UNLP), CONICET, La Plata, Argentina
Instituto de Geocronología y Geología Isotópica (INGEIS, CONICET-UBA), Buenos Aires, Argentina
Centro Nacional Patagónico (CENPAT-CONICET), Puerto Madryn, Argentina
Palabras clave:Arid climate; Geohydrology; Hydrochemistry; Patagonia; Salt marsh; Chlorine; Groundwater; Groundwater geochemistry; Hydrochemistry; Hydrogeology; Isotopes; Magnesium; Soils; Tides; Arid climates; Electrical conductivity; Groundwater salinizations; Isotopic composition; Patagonia; Physical and chemical properties; Salinization process; Salt marshes; Wetlands; arid environment; climate conditions; coastal wetland; electrical conductivity; groundwater; hydrodynamics; inorganic compound; isotopic composition; metal; numerical model; physicochemical property; piezometer; saline soil; salinization; saltmarsh; soil water; water table; Andes; Argentina; Patagonia
Año:2015
Volumen:73
Número:12
Página de inicio:7983
Página de fin:7994
DOI: http://dx.doi.org/10.1007/s12665-014-3957-3
Título revista:Environmental Earth Sciences
Título revista abreviado:Environ. Earth Sci.
ISSN:18666280
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18666280_v73_n12_p7983_Alvarez

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Citas:

---------- APA ----------
Alvarez, M.P., Dapeña, C., Bouza, P.J., Ríos, I. & Hernández, M.A. (2015) . Groundwater salinization in arid coastal wetlands: a study case from Playa Fracasso, Patagonia, Argentina. Environmental Earth Sciences, 73(12), 7983-7994.
http://dx.doi.org/10.1007/s12665-014-3957-3
---------- CHICAGO ----------
Alvarez, M.P., Dapeña, C., Bouza, P.J., Ríos, I., Hernández, M.A. "Groundwater salinization in arid coastal wetlands: a study case from Playa Fracasso, Patagonia, Argentina" . Environmental Earth Sciences 73, no. 12 (2015) : 7983-7994.
http://dx.doi.org/10.1007/s12665-014-3957-3
---------- MLA ----------
Alvarez, M.P., Dapeña, C., Bouza, P.J., Ríos, I., Hernández, M.A. "Groundwater salinization in arid coastal wetlands: a study case from Playa Fracasso, Patagonia, Argentina" . Environmental Earth Sciences, vol. 73, no. 12, 2015, pp. 7983-7994.
http://dx.doi.org/10.1007/s12665-014-3957-3
---------- VANCOUVER ----------
Alvarez, M.P., Dapeña, C., Bouza, P.J., Ríos, I., Hernández, M.A. Groundwater salinization in arid coastal wetlands: a study case from Playa Fracasso, Patagonia, Argentina. Environ. Earth Sci. 2015;73(12):7983-7994.
http://dx.doi.org/10.1007/s12665-014-3957-3