@article{PAR00001022,
  title = {{R}esolution of {MRS} applied to the characterization of hard-rock aquifers},
  author = {{L}egchenko, {A}natoli and {D}escloitres, {M}arc and {B}ost, {A}delphe and {R}uiz, {L}aurent and {R}eddy, {M}. and {G}irard, {J}.{F}. and {S}ekhar, {M}. and {K}umar, {M}.{S}.{M}. and {B}raun, {J}ean-{J}acques},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he performance of the {M}agnetic {R}esonance {S}ounding ({MRS}) method applied to the investigation of heterogeneous hard-rock aquifers was studied. {I}t was shown using both numerical modeling and field measurements that {MRS} could be applied to the investigation of the weathered part of hard-rock aquifers when the product of the free water content multiplied by the thickness of the aquifer is >0.2 (for example, 10-m-thick layer with a 2% water content). {U}sing a currently available one-dimensional {MRS} system, the method allows the characterization of two-dimensional subsurface structures with acceptable accuracy when the size of the subsurface anomaly is equal to or greater than the {MRS} loop. {H}owever, the fractured part of hard-rock aquifers characterized by low effective porosity (<0.5%) cannot be resolved using currently available {MRS} equipment. {I}t was found that shallow water in the weathered part of the aquifer may screen {MRS} signals from deeper water-saturated layers, thus further reducing the possibility of investigating deeper fractured aquifers. {A} field study using the {NUMIS}plus {MRS} system developed by {IRIS} {I}nstruments was carried out on an experimental watershed in southern {I}ndia. {A} heterogeneous unconfined aquifer in a gneissic formation was successfully localized, and {MRS} results were confirmed by drilling shortly after the geophysical study. {T}he top of the aquifer revealed by {MRS} was found to be in a good agreement with observed static water level measurements in boreholes.},
  keywords = {},
  booktitle = {},
  journal = {{G}round {W}ater},
  volume = {44},
  numero = {4},
  pages = {547--554},
  ISSN = {0017-467{X}},
  year = {2006},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00001022},
}