Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
Articles | Volume 24, issue 3
Articles | Volume 24, issue 3
Hydrol. Earth Syst. Sci., 24, 1293–1318, 2020
https://doi.org/10.5194/hess-24-1293-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Hydrol. Earth Syst. Sci., 24, 1293–1318, 2020
https://doi.org/10.5194/hess-24-1293-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 24, issue 3

Research article 19 Mar 2020

Research article | 19 Mar 2020

Groundwater mean residence times of a subtropical barrier sand island

Harald Hofmann et al.

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Latest update: 05 Dec 2021
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Short summary
Fresh groundwater (GW) on barrier islands is affected by GW use and precipitation variability. Mean residence times (MRTs) of GW on a sand barrier island were determined. They ranged from 37 years to more than 150 years for tritium and had a much larger range (modern to 5000 years) for carbon-14. Perched aquifer systems in the unsaturated zone and peat formations around wetlands are the most likely cause of longer MRTs, as they have a significant impact on regional recharge and flow diversion.
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