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@ARTICLE{Busch:151564,
      author       = {Busch, Sebastian and Weihermüller, Lutz and Huisman, Johan
                      A. and Steelman, Colby M. and Endres, Anthony L. and
                      Vereecken, Harry and van der Kruk, Jan},
      title        = {{C}oupled hydrogeophysical inversion of time-lapse surface
                      {GPR} data to estimate hydraulic properties of a layered
                      subsurface},
      journal      = {Water resources research},
      volume       = {49},
      number       = {12},
      issn         = {0043-1397},
      address      = {Washington, DC},
      publisher    = {AGU},
      reportid     = {FZJ-2014-01457},
      pages        = {8480 - 8494},
      year         = {2013},
      abstract     = {A major challenge in vadose zone hydrology is to obtain
                      accurate information on thetemporal changes of the vertical
                      soil water distribution and its feedback with theatmosphere
                      and groundwater. A state of the art coupled hydrogeophysical
                      inversion schemeis applied to evaluate soil hydraulic
                      properties of a synthetic model and a field soil insouthern
                      Ontario based on time-lapse monitoring of soil dynamics with
                      surface groundpenetratingradar (GPR). Film flow was included
                      in the hydrological model to account fornoncapillary water
                      flow in a sandy medium during dry conditions. The synthetic
                      studyillustrated that GPR data contain sufficient
                      information to accurately constrain soilhydraulic parameters
                      within a coupled inversion framework and led to an
                      accurateestimation of the soil hydraulic properties. When
                      film flow was not accounted for within theinversion, an
                      equally good fit could still be achieved. In this case,
                      errors introduced byneglecting film flow were compensated by
                      different hydraulic parameters. For the field data,the
                      coupled inversion reduced the overall misfit compared to an
                      uncalibrated model usinghydraulic parameters obtained from
                      laboratory data. Although the data fit improvedsignificantly
                      for water content in the deeper soil layers, accounting for
                      film flow in theuppermost subsurface layer did not lead to a
                      better fit of the GPR data. Further research isneeded to
                      describe the processes controlling water content in the dry
                      range, in particularcoupled heat and vapor transport. This
                      study illustrates the suitability of surface GPRmeasurements
                      combined with coupled inversion for near-surface
                      characterization of soilhydraulic parameters.},
      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:000329929100044},
      doi          = {10.1002/2013WR013992},
      url          = {https://juser.fz-juelich.de/record/151564},
}