@article{PAR00002994,
  title = {{U}sing 2{D} inversion of magnetic resonance soundings to locate a water-filled karst conduit},
  author = {{B}oucher, {M}. and {G}irard, {J}.{F}. and {L}egchenko, {A}natoli and {B}altassat, {J}.{M}. and {D}{\¨o}rfliger, {N}. and {C}halikakis, {K}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} new methodology for magnetic resonance sounding ({MRS}) data acquisition and interpretation was developed for locating water-filled karst cavities. {T}his methodology was used to investigate the {O}uysse karst system in the {P}oumeyssens shaft in the {C}ausse de {G}ramat ({F}rance). {A} new 2{D} numerical {MRS} response model was designed for improved accuracy over the previous 1{D} {MRS} approach. {A} special survey performed by cave divers confirmed the accuracy of the {MRS} results. {F}ield results demonstrated that in favourable conditions (a low {EM} noise environment and a relatively shallow, large target) the {MRS} method, used with a coincident transmitter/receiver loop, can be an effective tool for locating a water-filled karst conduit. {I}t was shown numerically that because an a priori orientation of the {MRS} profile with the karst conduit is used in the inversion scheme (perpendicular for instance), any error in this assumption introduces an additional error in locating the karst. {H}owever, the resulting error is within acceptable limits when the deviation is less than 30°. {T}he {MRS} results were compared with an electrical resistivity tomography ({ERT}) survey. {I}t was found that in {P}oumeyssens, {ERT} is not able to locate the water-filled karst. {O}n the other hand, {ERT} provides additional information about heterogeneities in the limestone.},
  keywords = {{G}eophysical methods ; {K}arst ; {C}ausse de {G}ramat ; {MRS}},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {330},
  numero = {3-4},
  pages = {413--421},
  year = {2006},
  DOI = {10.1016/j.jhydrol.2006.03.034},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00002994},
}