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@ARTICLE{Mboh:133500,
      author       = {Mboh, C. M. and Huisman, J. A. and van Gaelen, N. and
                      Rings, J. and Vereecken, H.},
      title        = {{C}oupled hydrogeophysical inversion of electrical
                      resistances and inflow measurements for topsoil hydraulic
                      properties under constant head infiltration},
      journal      = {Near surface geophysics},
      volume       = {10},
      number       = {5},
      issn         = {1569-4445},
      address      = {Houten},
      publisher    = {EAGE},
      reportid     = {FZJ-2013-01938},
      pages        = {413 - 426},
      year         = {2012},
      note         = {C.M. Mboh and J.A. Huisman gratefully acknowledge support
                      by grant HU1312/2-1 and HU1312/2-2 of the Deutsche
                      Forschungsgemeinschaft. The reviewers (C. Mendonca, R.P.
                      Singh and M. Devanatha) are thanked for their constructive
                      comments that improved the quality of the manuscript.},
      abstract     = {Accurate estimation of topsoil hydraulic properties is
                      important for understanding water flow and solute transport
                      in the vadose zone. Coupled hydrogeophysical inversion
                      schemes that enable the use of multiple geophysical and
                      hydrological data for the estimation of soil hydraulic
                      properties have recently been proposed. In these coupled
                      inversion schemes, a hydrological model describing the
                      process under investigation is coupled to a forward
                      geophysical model and hydraulic parameters are directly
                      estimated from geophysical measurements. While these schemes
                      provide a suitable platform for the integration of multiple
                      geophysical and hydrological data, efficient methods to
                      combine these data types for improved parameter estimation
                      still warrant investigation. In this study, we investigated
                      the feasibility of estimating three topsoil Mualem-van
                      Genuchten parameters from the fusion of inflow and
                      electrical resistance measurements obtained under constant
                      head infiltration. In addition to using only inflow or
                      electrical resistances, we investigated three methods of
                      combining these data for improved estimation of topsoil
                      hydraulic parameters. Our results show that using inflow
                      alone does not provide a unique solution to the inverse
                      problem. Better results are obtained with the additional use
                      of electrical resistance data. We show that successful data
                      fusion within the coupled hydrogeophysical inversion
                      framework depends on the choice of an appropriate objective
                      function. We obtained the best data fusion results with an
                      objective function defined as the sum of the root mean
                      square error of both data types normalized by the standard
                      deviation of the respective measurements. In this case, the
                      inverted hydraulic parameters were very comparable to
                      reference values obtained from a multi-step outflow
                      experiment carried out with undisturbed soil cores from the
                      experimental site. It is concluded that the coupled
                      hydrogeophysical inversion framework is a promising tool for
                      non-invasive near-surface hydrological investigations.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246)},
      pid          = {G:(DE-HGF)POF2-246},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000310424400006},
      doi          = {10.3997/1873-0604.2012009},
      url          = {https://juser.fz-juelich.de/record/133500},
}