Combining radon, short-lived radium isotopes and hydrodynamic modeling to assess submarine groundwater discharge from an anthropized semiarid watershed to a Mediterranean lagoon (Mar Menor, SE Spain)
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Baudron, Paul; Cockenpot, Sabine; López Castejón, Francisco; Radakovitch, Olivier; Gilabert Cervera, Francisco Javier; [et al.]Área de conocimiento
EcologíaPatrocinadores
This work was developed within the scope of the Projects “Modelación Hidrológica en Zonas Semi Aridas” and “Monitorización Costera para el Mar Menor, CMS (463.01-08_CLUSTER)” financed by the Regional Ministry of Universities, Business and Research (Region of Murcia, Spain). The authors acknowledge the Fundación Instituto Euromediterráneo del Agua (Murcia, Spain) for its fundamental financial support. Additional supports came through the “CARTAG-EAU” project financed by the French SICMED initiative the CGL2013-48424-C2-2-R project financed by the National Plan for Scientific and Technical Research and Innovation of Spain, and the 08225/PI/08 research project financed by “Programa de Generación del Conocimiento Científico de Excelencia” of the Fundación Seneca, Región de Murcia (II PCTRM 2007-10)Fecha de publicación
2015-06Editorial
ElsevierRevisión por pares
siPalabras clave
Submarine groundwater dischargeRadon
Radium
Hydrodynamic modeling
Nitrate
Reverse osmosis desalination
Resumen
In highly anthropized watersheds, surface water tributaries may carry unexpected high quantities of radon and radium to coastal lagoons. Investigating submarine groundwater discharge (SGD) with radionuclide tracers is therefore a complex task. In order to quantify SGD and decipher the influence of the different water sources, we combined a radon (222Rn) and short-lived radium (223Ra, 224Ra) survey with the hydrodynamic modeling of a lagoon. We applied it to the Mar Menor lagoon (SE Spain) where surface water tributaries and undocumented emissaries carry water from groundwater drainage and brines from groundwater desalinization. We identified the areas of influence of the plume of radionuclides from the river, located major areas of SGD and proposed a location for two submarine emissaries. Porewater, i.e. interstitial water from underlying sediments, was found to be the most representative SGD end member, compared to continental groundwater collected from piezometers. Mass balances in ...
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