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@ARTICLE{Mangel:840430,
      author       = {Mangel, Adam R. and Moysey, Stephen M. J. and van der Kruk,
                      Jan},
      title        = {{R}esolving {I}nfiltration-{I}nduced {W}ater {C}ontent
                      {P}rofiles by {I}nversion of {D}ispersive
                      {G}round-{P}enetrating {R}adar {D}ata},
      journal      = {Vadose zone journal},
      volume       = {16},
      number       = {10},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {FZJ-2017-07947},
      pages        = {0 -},
      year         = {2017},
      abstract     = {Ground-penetrating radar (GPR) data were collected before,
                      during, and after a 24-min-long forced infiltration event in
                      a large sand tank. High spatial and temporal resolution were
                      achieved by automation of the radar system, thereby allowing
                      these data to be collected during the course of the
                      experiment while continuously changing the distance between
                      the antennas through offsets ranging between 0.17 and 2.17
                      m. These multi-offset data showed evidence of a phenomenon
                      known as waveguide dispersion during early infiltration
                      times (5–10 min), indicating that a shallow layer of high
                      water content was present. The GPR data exhibiting this
                      dispersive behavior were used to fit water content profiles
                      for the wetting front, i.e., the waveguide, with time using
                      either a blocky-layer model or a piecewise linear function.
                      Results from the separate inversions showed good agreement
                      with in situ soil moisture measurements and a calibrated
                      unsaturated flow model. The piecewise linear model, however,
                      was able to honor the gradational nature of the
                      hydrologically induced waveguide and was in better agreement
                      with the observed soil moisture data. Furthermore, the
                      piecewise linear model returned a water content profile that
                      showed a consistent progression of the wetting front with
                      time, whereas a less consistent progression of the wetting
                      front was observed for the blocky-layer model.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000413430000008},
      doi          = {10.2136/vzj2017.02.0037},
      url          = {https://juser.fz-juelich.de/record/840430},
}