% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Mester:17744,
      author       = {Mester, A. and van der Kruk, J. and Zimmermann, E. and
                      Vereecken, H.},
      title        = {{Q}uantitative {T}wo-{L}ayer {C}onductivity {I}nversion of
                      {M}ulti-{C}onfiguration {E}lectromagnetic {I}nduction
                      {M}easurements},
      journal      = {Vadose zone journal},
      volume       = {10},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-17744},
      pages        = {1319 - 1330},
      year         = {2011},
      note         = {We thank the reviewer F. A. Monteiro Santos and two unknown
                      reviewers, the associate editor A. Revil, and co-editor S.
                      Hubbard for their help in improving the manuscript. 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) and 'TERrestrial ENvironmental
                      Observatories' (TERENO).},
      abstract     = {Electromagnetic induction (EMI) measurements return an
                      apparent electrical conductivity that represents a weighted
                      average of the electrical conductivity distribution over a
                      certain depth range. Different sensing depths are obtained
                      for different orientations, different coil off sets, and
                      different frequencies, which, in principle, can be used for
                      a multi-layer inversion. However, instrumental shifts, which
                      often occur in EMI data, prevent the use of quantitative
                      multi-layer inversion. Recently, a new calibration method
                      was developed that uses electrical resistivity tomography
                      (ERT) inversion results and returns quantitative apparent
                      conductivity values. Here, we introduce an inversion scheme
                      that uses calibrated EMI data and inverts for a two-layer
                      earth. The inversion minimizes the misfit between the
                      measured and modeled magnetic field by a combined global and
                      local search and does not use any smoothing parameter.
                      Application of this new scheme to synthetic data
                      demonstrates its efficacy in providing the required physical
                      property information. Inversion of calibrated experimental
                      EMI data using horizontal coplanar (HCP) and vertical
                      coplanar (VCP) loop configurations, coil off sets of 1 and
                      1.22 m, and frequencies of 8 and 15 kHz provides lateral and
                      vertical conductivity variations very similar to those
                      observed in an elaborate ERT experiment. The inversion is
                      verified using synthetic EMI data calculated from ERT data.
                      Inverting quantitative EMI data using this two-layer
                      inversion enables the quantitative mapping of lateral and
                      vertical electrical conductivity variations over large
                      areas.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3 / ZEL},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEL-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297377000017},
      doi          = {10.2136/vzj2011.0035},
      url          = {https://juser.fz-juelich.de/record/17744},
}