Groundwater investigation on sand dunes area in southern part of Vietnam by magnetic resonance sounding |
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Authors: | Nguyen V Giang Tang D Nam Maksim Bano |
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Institution: | 1. Institute of Geophysics, VAST, Hanoi, Vietnam 2. Institute of Geology and Mineral Resources, MONRE, Hanoi, Vietnam 3. Ecole et Observatoire des Sciences de la Terre, Strasbourg University, Strasbourg, France
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Abstract: | In the last five years, magnetic resonance sounding (MRS), as a non-invasive geophysical method, has emerged as a new technique
for ground water investigation in Vietnam. In this paper, we present the general theoretical basis of this method together
with acquisition, processing, and interpretation of the MRS data. We show a case study of MRS surveys in sand dunes area in
order to characterize aquifers situated in the southern part of Vietnam. From the interpretation of MRS soundings we delimited
an aquifer layer in the subsurface with strong lateral variations for which we determined the depth at 44 m and water content
between 3% and 9.5%. The longitudinal relaxation constant T*1 is about 250 m s, while the transverse relaxation T*2 is between 150–200 m s. That indicates fine to medium grain size and thus low to medium hydraulic permeability. These results
are confirmed by the observations from the well LK1 between 45 to 70 m. The results of other MRS measurements showed the presence
of a low water bearing aquifer and were confirmed by the observations in two other wells. |
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