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    Isotopic, geophysical and biogeochemical investigation of submarine groundwater discharge : IAEA-UNESCO intercomparison exercise at Mauritius Island

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    Mauritius - resubm..pdf (1.145Mb)
    Date
    2011-09
    Author
    Povinec, Pavel P.  Concept link
    Burnett, William C.  Concept link
    Beck, A.  Concept link
    Bokuniewicz, Henry J.  Concept link
    Charette, Matthew A.  Concept link
    Gonneea, Meagan E.  Concept link
    Groening, M.  Concept link
    Ishitobi, T.  Concept link
    Kontar, E.  Concept link
    Kwong, L. Liong Wee  Concept link
    Marie, D. E. P.  Concept link
    Moore, Willard S.  Concept link
    Oberdorfer, J. A.  Concept link
    Peterson, R.  Concept link
    Ramessur, R.  Concept link
    Rapaglia, J.  Concept link
    Stieglitz, T.  Concept link
    Top, Zafer  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4926
    As published
    https://doi.org/10.1016/j.jenvrad.2011.09.009
    Keyword
     Submarine groundwater discharge; Groundwater; Seawater; Seepage meters; Stable isotopes; δD; δ18O; Tritium; Radium isotopes; Radon; Nutrients; Coastal zone; Volcanic island; Mauritius Island 
    Abstract
    Submarine groundwater discharge (SGD) into a shallow lagoon on the west coast of Mauritius Island (Flic-en-Flac) was investigated using radioactive (3H, 222Rn, 223Ra, 224Ra, 226Ra, 228Ra) and stable (2H, 18O) isotopes and nutrients. SGD intercomparison exercises were carried out to validate the various approaches used to measure SGD including radium and radon measurements, seepage-rate measurements using manual and automated meters, sediment bulk conductivity and salinity surveys. SGD measurements using benthic chambers placed on the floor of the Flic-en-Flac Lagoon showed discharge rates up to 500 cm/day. Large variability in SGD was observed over distances of a few meters, which were attributed to different geomorphological features. Deployments of automated seepage meters captured the spatial and temporal variability of SGD with a mean seepage rate of 10 cm/day. The stable isotopic composition of submarine waters was characterized by significant variability and heavy isotope enrichment and was used to predict the contribution of fresh terrestrially derived groundwater to SGD (range from a few % to almost 100 %). The integrated SGD flux, estimated from seepage meters placed parallel to the shoreline, was 35 m3/m day, which was in a reasonable agreement with results obtained from hydrologic water balance calculation (26 m3/m day). SGD calculated from the radon inventory method using in situ radon measurements were between 5 and 56 m3/m per day. Low concentrations of radium isotopes observed in the lagoon water reflected the low abundance of U and Th in the basalt that makes up the island. High SGD rates contribute to high nutrients loading to the lagoon, potentially leading to eutrophication. Each of the applied methods yielded unique information about the character and magnitude of SGD. The results of the intercomparison studies have resulted a better understanding of groundwater-seawater interactions in coastal regions. Such information is an important pre-requisite for the protection management of coastal freshwater resources.
    Description
    Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Journal of Environmental Radioactivity 104 (2012): 24-45, doi:10.1016/j.jenvrad.2011.09.009.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Povinec, Pavel P., Burnett, William C., Beck, A., Bokuniewicz, Henry J., Charette, Matthew A., Gonneea, Meagan E., Groening, M., Ishitobi, T., Kontar, E., Kwong, L. Liong Wee, Marie, D. E. P., Moore, Willard S., Oberdorfer, J. A., Peterson, R., Ramessur, R., Rapaglia, J., Stieglitz, T., Top, Zafer, "Isotopic, geophysical and biogeochemical investigation of submarine groundwater discharge : IAEA-UNESCO intercomparison exercise at Mauritius Island", 2011-09, https://doi.org/10.1016/j.jenvrad.2011.09.009, https://hdl.handle.net/1912/4926
     

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