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@ARTICLE{Hinnell:12102,
      author       = {Hinnell, A.C. and Ferre, T.P.A. and Vrugt, J.A. and
                      Huisman, J. A. and Moysey, S. and Rings, J. and Kowalsky,
                      M.B.},
      title        = {{I}mproved extraction of hydrologic information from
                      geophysical data through coupled hydrogeophysical inversion},
      journal      = {Water resources research},
      volume       = {46},
      issn         = {0043-1397},
      address      = {Washington, DC},
      publisher    = {AGU},
      reportid     = {PreJuSER-12102},
      pages        = {W00D30},
      year         = {2010},
      note         = {We would like to thank Kamini Singha and the anonymous
                      reviewers for their thorough reviews and helpful suggestions
                      for improving the manuscript. During this project, Andrew
                      Hinnell was supported by the National Research Initiative of
                      the USDA Cooperative State Research, Education and Extension
                      Service, grant 2003-351023674. Ty Ferre was supported by the
                      National Science Foundation as the director of the CUAHSI
                      HydroGeoPhysics facility under grant EAR 07-53521 awarded to
                      the Consortium of Universities for the Advancement of
                      Hydrologic Science. Jasper Vrugt was supported by a J.
                      Robert Oppenheimer Fellowship from the Los Alamos National
                      Laboratory postdoctoral program. J. A. Huisman is supported
                      by grant HU1312/2 of the Deutsche Forschungsgemeinschaft
                      (DFG). Michael Kowalsky was supported by the U.S. Department
                      of Energy, contract DE-AC02-05CH11231.},
      abstract     = {There is increasing interest in the use of multiple
                      measurement types, including indirect (geophysical) methods,
                      to constrain hydrologic interpretations. To date, most
                      examples integrating geophysical measurements in hydrology
                      have followed a three-step, uncoupled inverse approach. This
                      approach begins with independent geophysical inversion to
                      infer the spatial and/or temporal distribution of a
                      geophysical property (e. g., electrical conductivity). The
                      geophysical property is then converted to a hydrologic
                      property (e. g., water content) through a petrophysical
                      relation. The inferred hydrologic property is then used
                      either independently or together with direct hydrologic
                      observations to constrain a hydrologic inversion. We present
                      an alternative approach, coupled inversion, which relies on
                      direct coupling of hydrologic models and geophysical models
                      during inversion. We compare the abilities of coupled and
                      uncoupled inversion using a synthetic example where
                      surface-based electrical conductivity surveys are used to
                      monitor one dimensional infiltration and redistribution.
                      Through this illustrative example, we show that the coupled
                      approach can provide significant reductions in uncertainty
                      for hydrologic properties and associated predictions if the
                      underlying model is a faithful representation of the
                      hydrologic processes. However, if the hydrologic model
                      exhibits structural errors, the coupled inversion may not
                      improve the hydrologic interpretation. Despite this
                      limitation, our results support the use of coupled
                      hydrogeophysical inversion both for the direct benefits of
                      reduced errors during inversion and because of the secondary
                      benefits that accrue because of the extensive communication
                      and sharing of data necessary to produce a coupled model,
                      which will likely lead to more thoughtful use of geophysical
                      data in hydrologic studies.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Limnology / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000276552300001},
      doi          = {10.1029/2008WR007060},
      url          = {https://juser.fz-juelich.de/record/12102},
}