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@ARTICLE{Lavou:11993,
      author       = {Lavoué, F. and van der Kruk, J. and Rings, J. and André,
                      F. and Moghadas, D. and Huisman, J. A. and Lambot, S. and
                      Weihermüller, L. and Vanderborght, J. and Vereecken, H.},
      title        = {{E}lectromagnetic induction calibration using apparent
                      electrical conductivity modelling based on electrical
                      resistivity tomography},
      journal      = {Near surface geophysics},
      volume       = {8},
      issn         = {1569-4445},
      address      = {Houten},
      publisher    = {EAGE},
      reportid     = {PreJuSER-11993},
      pages        = {553 - 561},
      year         = {2010},
      note         = {We acknowledge the support by the SFB/TR 32 'Pattern in
                      Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling
                      and Data Assimilation' funded by the Deutsche
                      Forschungsgemeinschaft (DFG). This project was initiated
                      during a three-month internship of F. Lavoue at the
                      Forschungszentrum Juelich. F. Lavoue acknowledges the
                      support of the Ecole Normale Superieure de Lyon, France. Two
                      anonymous reviewers helped to improve the manuscript.},
      abstract     = {Electromagnetic parameters of the subsurface such as
                      electrical conductivity are of great interest for
                      non-destructive determination of soil properties (e.g., clay
                      content) or hydrologic state variables (e.g., soil water
                      content). In the past decade, several non-invasive
                      geophysical methods have been developed to measure
                      subsurface parameters in situ. Among these methods,
                      electromagnetic (EM) induction appears to be the most
                      efficient one that is able to cover large areas in a short
                      time. However, this method currently does not provide
                      absolute values of electrical conductivity due to
                      calibration problems, which hinders a quantitative analysis
                      of the measurement. In this study, we propose to calibrate
                      EM induction measurements with electrical conductivity
                      values measured with electrical resistivity tomography
                      (ERT). EM induction measures an apparent electrical
                      conductivity at the surface, which represents a weighted
                      average of the electrical conductivity distribution over a
                      certain depth range, whereas ERT inversion can provide
                      absolute values for local conductivities as a function of
                      depth. EM induction and ERT measurements were collected
                      along a 120-metre-long transect. To reconstruct the apparent
                      electrical conductivity measured with EM induction, the
                      inverted ERT data were used as input in an electromagnetic
                      forward modelling tool for magnetic dipoles over a
                      horizontally layered medium considering the frequencies and
                      offsets used by the EM induction instruments. Comparison of
                      the calculated and measured apparent electrical
                      conductivities shows very similar trends but a shift in
                      absolute values, which is attributed to system calibration
                      problems. The observed shift can be corrected for by linear
                      regression. This new calibration strategy for EM induction
                      measurements now enables the quantitative mapping of
                      electrical conductivity values over large areas.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4 / JARA-ENERGY},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000285399200013},
      doi          = {10.3997/1873-0604.2010037},
      url          = {https://juser.fz-juelich.de/record/11993},
}