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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 8
Hydrol. Earth Syst. Sci., 20, 3077–3098, 2016
https://doi.org/10.5194/hess-20-3077-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 20, 3077–3098, 2016
https://doi.org/10.5194/hess-20-3077-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Aug 2016

Research article | 01 Aug 2016

Assessing land–ocean connectivity via submarine groundwater discharge (SGD) in the Ria Formosa Lagoon (Portugal): combining radon measurements and stable isotope hydrology

Carlos Rocha et al.

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Cited articles

Almasri, M. N. and Kaluarachchi, J. J.: Assessment and management of long-term nitrate pollution of ground water in agriculture-dominated watersheds, J. Hydrol., 295, 225–245, 2004.
Almeida, C. and Silva, M. L.: Incidence of agriculture on water quality at Campina de Faro (south Portugal), in: Hidrogeologia-y-Recursos-Hidraulicos, Associacion Españolade Hidrologia Subterranea, Madrid, Spain, 12, 249–257, 1987.
Almeida, C. J., Mendonca, J. J. L., Jesus, M. R., and Gomes, A. J.: Sistemas aquiferos de Portugal Continental (Aquifer Systems of Continental Portugal), Instituto Nacional da Água, INAG, Lisbon, 2000.
Balouin, Y.: Les embouchures mésotidales (tidal inlets) et leur relation avec les littoraux adjacents, exemple de la Barra Nova, sud Portugal, PhD thesis, University of Bordeaux, Bordeaux, 2001.
Barnes, C. J. and Allison, G. B.: The distribution of deuterium and 18O in dry soils: 1. Theory, J. Hydrol., 60, 141–156, 1983.
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We combine radon and stable isotopes in water to determine total submarine groundwater discharge (SGD) in the Ria Formosa and discriminate its component modes. We show that tidal action filters the entire water volume in the lagoon through local beaches 3.5 times a year, driving an estimated 350Ton nitrogen/year into the system. Conversely, fresh groundwater is discharged into the lagoon only occasionally, adding ~ 61 Ton nitrogen/year, but is capable of driving new production in the system.
We combine radon and stable isotopes in water to determine total submarine groundwater discharge...
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