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@ARTICLE{Laloy:18205,
      author       = {Laloy, E. and Javaux, M. and Vanclooster, M. and Roisin, C.
                      and Bielders, C.L.},
      title        = {{E}lectrical resistivity in a loamy soil: {I}dentification
                      of the appropriate pedo-electrical model},
      journal      = {Vadose zone journal},
      volume       = {10},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-18205},
      pages        = {1023 - 1033},
      year         = {2011},
      note         = {This work was supported by the Direction Generale de
                      l'Agriculture, des Ressources Naturelles et de
                      l'Environnement of the Walloon Region (DGARNE-RW) within the
                      project INFOSOL. Support of J. Verswijvel in the laboratory
                      ERT measurements is highly appreciated. We thank Damien
                      Jougnot and John Koestel for their many useful comments and
                      suggestions. We also acknowledge Andre Revil for fruitful
                      discussions.},
      abstract     = {Electrical resistance tomography (ERT) can be used for the
                      noninvasive characterization of soil moisture and soil
                      structural heterogeneity. Any attempt to relate electrical
                      resistivity measurements to soil moisture content or soil
                      bulk density, however, must rely on a "pedo-electrical"
                      function, i.e., a conductivity model for soils. This study
                      aimed to test five pedo-electrical models for their ability
                      to reproduce electrical resistivity as measured by ERT in a
                      silt loam soil sample across a range of moisture and bulk
                      density values. The Waxman and Smits model, the Revil model,
                      the volume-averaging (VA) model, the Rhoades model, and the
                      Mojid model were inverted within a Bayesian framework,
                      thereby identifying not only the optimal parameter set but
                      also parameter uncertainty and its effect on model
                      prediction. The VA model outperformed the other models in
                      terms of both fit and parameter consistency with respect to
                      independent estimates of surface conductivity obtained with
                      published pedotransfer functions. Sensitivity of the
                      electrical resistivity was then studied by means of the
                      calibrated VA model, revealing an approximately 1.5 times
                      higher sensitivity to soil moisture content than to soil
                      bulk density. In addition, the sensitivity of electrical
                      resistivity to soil moisture and soil bulk density was found
                      to increase as soil moisture and bulk density decreased. The
                      VA model calibrated on the basis of resistivity measurements
                      appeared to simulate relatively well the measured soil
                      moisture content for electrical resistivity values < 100
                      Omega m. As opposed to water content, the soil porosity was
                      badly approximated by the model. It appears therefore that
                      ERT is more suitable for detecting heterogeneity in soil
                      water content than differences in soil bulk density.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000294007600019},
      doi          = {10.2136/vzj2010.0095},
      url          = {https://juser.fz-juelich.de/record/18205},
}