Efficiency of joint use of MRS and VES to characterize coastal aquifer in Myanmar |
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| Institution: | 1. Institut de Recherche pour le Développement, Indo-French Cell for Water Science, Indian Institute of Science, 560012 Bangalore, India;2. Action contre la Faim, 4 rue Niepce, 75014 Paris, France;3. Bureau de Recherche Géologiques et Minières, BP 6009, 45060 Orléans Cedex, France;1. Institute of Geography, Russian Academy of Sciences, per. Staromonetnyi 29, Moscow, 119017, Russia;2. Lomonosov Moscow State University, Moscow, 119899, Russia;3. Institute of Archaeology, Russian Academy of Sciences, ul. Dm. Ul''uanova 19, Moscow, 117036, Russia;1. Department of Geosciences, Mississippi State University, 355 E. Lee Blvd., 108 Hilbun Hall, Mississippi State, MS 39762-5448, United States;2. Department of Geosciences, Mississippi State University, Mississippi State, MS 39762-5448, United States;3. Agricultural Research Service, US Department of Agriculture, Oxford, MS 38655, United States;1. Laboratory of Applied Sciences, Research Team of Water and Environment Management (G2E), ENSAH, Abdelmalek Essaadi University, Al Hoceima, Morocco;2. Department of Geology, Faculty of Sciences and Techniques, Abdelmalek Essaadi University, Tangier, Morocco;3. Department of Geography, Faculty of Letters and Human Sciences, Mohammed First University, Oujda, Morocco;1. Laboratory GEOHYD, Faculty of Sciences Semlalia, University Cadi Ayyad, Morocco;2. OLMAN-RL Laboratory, BP 300 Selouane, 62702, University Mohamed I Oujda, Morocco;3. Faculty of Geology, University of Barcelona, Marti I Franques, S/N, 08028 Barcelona, Spain;4. National School of Applied Sciences (ENSA), Mohammed Premier University, Morocco;1. Physics and Earth Sciences Department, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy;2. Interdepartmental Research Centre for Environmental Sciences (CIRSA), University of Bologna, Via San Alberto 163, 48100 Ravenna, Italy;3. Earth Sciences Department, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Roma, Italy;4. DICATECh, Department of Civil Environmental Land and Construction Engineering and Chemistry, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy |
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| Abstract: | The productivity and the water quality of coastal aquifers can be highly heterogeneous in a complex environment. The characterization of these aquifers can be improved by hydrogeological and complementary geophysical surveys. Such an integrated approach is developed in a non-consolidated coastal aquifer in Myanmar (previously named Burma).A preliminary hydrogeological survey is conducted to know better the targeted aquifers. Then, 25 sites are selected to characterize aquifers through borehole drillings and pumping tests implementation. In the same sites, magnetic resonance soundings (MRS) and vertical electrical soundings (VES) are carried out. Geophysical results are compared to hydrogeological data, and geophysical parameters are used to characterize aquifers using conversion equations. Finally, combining the analysis of technical and economical impacts of geophysics, a methodology is proposed to characterize non-consolidated coastal aquifers.Depth and thickness of saturated zone is determined by means of MRS in 68% of the sites (evaluated with 34 soundings). The average accuracy of confined storativity estimated with MRS is ± 6% (evaluated over 7 pumping tests) whereas the average accuracy of transmissivity estimation with MRS is ± 45% (evaluated using 15 pumping tests). To reduce uncertainty in VES interpretation, the aquifer geometry estimated with MRS is used as a fixed parameter in VES inversion. The accuracy of groundwater electrical conductivity evaluation from 15 VES is enough to estimate the risk of water salinity. In addition, the maximum depth of penetration of the MRS depends on the rocks' electrical resistivity and is between 20 and 80 m at the study area. |
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