title: Magnetic resonance sounding applied to aquifer characterization.
abstract: Magnetic resonance sounding (MRS) is distinguished from other geophysical tools used for ground water investigation by the fact that it measures a magnetic resonance signal generated directly from subsurface water molecules. An alternating current pulse energizes a wire loop on the ground surface and the MRS signal is generated; subsurface water is indicated, with a high degree of reliability, by nonzero amplitude readings. Measurements with varied pulse magnitudes then reveal the depth and thickness of water saturated layers. The hydraulic conductivity of aquifers can also be estimated using boreholes for calibration. MRS can be used for both predicting the yield of water supply wells and for interpolation between boreholes, thereby reducing the number of holes required for hydrogeological modeling. An example of the practical application of MRS combined with two-dimensional electrical imaging, in the Kerbernez and Kerien catchments area of France, demonstrates the efficiency of the technique.
authors.affiliation: Bureau de Recherches Géologiques et Minières, 3, avenue C. Guillemin, BP 6009, 45060, Orleans cedex 2, France. an.leg@mail.com
authors.forename: Anatoly
authors.initials: A
authors.lastname: Legchenko
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Baltassat
authors.forename: Alexey
authors.initials: A
authors.lastname: Bobachev
authors.forename: Charlotte
authors.initials: C
authors.lastname: Martin
authors.forename: Henri
authors.initials: H
authors.lastname: Robain
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Vouillamoz
mesh_terms: D004553:Electric Conductivity; D004784:Environmental Monitoring / Q000379:methods*; D055593:Geological Phenomena; D005844:Geology; D008280:Magnetics; D012987:Soil; D014881:Water Supply
chemical_list: D012987:Soil