Academic Journal
Isotopic, geophysical and biogeochemical investigation of submarine groundwater discharge: IAEA-UNESCO intercomparison exercise at Mauritius Island.
| العنوان: | Isotopic, geophysical and biogeochemical investigation of submarine groundwater discharge: IAEA-UNESCO intercomparison exercise at Mauritius Island. |
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| المؤلفون: | Povinec, P. P., Burnett, W. C., Beck, A., Bokuniewicz, H., Charette, M., Gonneea, M. E., Groening, M., Ishitobi, T., Kontar, E., Liong Wee Kwong, L., Marie, D. E. P., Moore, W. S., Oberdorfer, J. A., Peterson, R., Ramessur, R., Rapaglia, J., Stieglitz, Thomas, Top, Z. |
| المساهمون: | Faculty of Mathematics, Physics and Informatics Bratislava (FMPH/UNIBA), Comenius University in Bratislava, Illinois State Geological Survey, University of Illinois System-University of Illinois System, Department of Oceanography, Florida State University Tallahassee (FSU), Marine Sciences Research Center (New-York, USA), Stony Brook University SUNY (SBU), State University of New York (SUNY)-State University of New York (SUNY), Woods Hole Oceanographic Institution (WHOI), International Atomic Energy Agency, International Atomic Energy Agency Vienna (IAEA), Research Institute for Humanity and Nature (RIHN), P.P. Shirshov Institute of Oceanology (SIO), Russian Academy of Sciences Moscow (RAS), Marine Environment Laboratories Monaco (IAEA-MEL), Mauritius Oceanography Institute, Department of Geological Sciences, University of South Carolina Columbia, Department of Geology, San Jose State University San Jose (SJSU), Department of Chemistry, University of Mauritius, School of Engineering and physical Sciences, James Cook University (JCU), Australian Institute of Marine Science Townsville (AIMS Townsville), Australian Institute of Marine Science (AIMS), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami Coral Gables |
| المصدر: | ISSN: 0265-931X. |
| بيانات النشر: | CCSD Elsevier |
| سنة النشر: | 2012 |
| المجموعة: | Université de Bretagne Occidentale: HAL |
| مصطلحات موضوعية: | [SDE]Environmental Sciences |
| الوصف: | International audience ; Submarine groundwater discharge (SGD) into a shallow lagoon on the west coast of Mauritius Island (Flic-en-Flac) was investigated using radioactive ((3)H, (222)Rn, (223)Ra, (224)Ra, (226)Ra, (228)Ra) and stable ((2)H, (18)O) 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 m(3)/m day, which was in reasonable agreement with results obtained from a hydrologic water balance calculation (26 m(3)/m day). SGD calculated from the radon inventory method using in situ radon measurements were between 5 and 56 m(3)/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 ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/pmid/22115434; PUBMED: 22115434 |
| DOI: | 10.1016/j.jenvrad.2011.09.009 |
| الاتاحة: | https://hal.univ-brest.fr/hal-00789106 https://doi.org/10.1016/j.jenvrad.2011.09.009 |
| رقم الانضمام: | edsbas.89B1CFF6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.jenvrad.2011.09.009 |
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