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@ARTICLE{Mboh:15981,
      author       = {Mboh, C.M. and Huisman, J.A. and Vereecken, H.},
      title        = {{F}easibility of {S}equential and {C}oupled {I}nversion of
                      {T}ime {D}omain {R}eflectometry {D}ata to {I}nfer {S}oil
                      {H}ydraulic {P}arameters under {F}alling {H}ead
                      {I}nfiltration},
      journal      = {Soil Science Society of America journal},
      volume       = {75},
      number       = {3},
      issn         = {0361-5995},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-15981},
      pages        = {775 - 786},
      year         = {2011},
      note         = {C.M. Mboh and J.A. Huisman are supported by grant
                      HU1312/2-1 and HU1312/2-2 of the Deutsche
                      Forschungsgemeinschaft.},
      abstract     = {Accurate estimation of soil hydraulic properties is a
                      prerequisite for efficient soil and water management. On a
                      small scale, time domain reflectometry (TDR) measurements
                      obtained during an infiltration event can be used for
                      estimating soil hydraulic properties either using a
                      sequential or a coupled inversion approach. In the
                      traditional sequential approach, the TDR measurements are
                      inverted into water content averages based on travel time
                      analysis and subsequently used for calibrating a hydrologic
                      model. Travel time analysis has been reported to be
                      subjective and difficult to use for analyzing TDR
                      measurements obtained during infiltration. In this paper, we
                      extend the sequential inversion approach by using water
                      content profiles (WCPs) obtained via inverse modeling of TDR
                      measurements and introduce a coupled inversion approach
                      which directly uses the TDR measurements for constraining
                      the inversion for hydraulic properties without first
                      inverting them into WCPs or averages. By comparing the
                      feasibility of these approaches to infer three Mualem-van
                      Genuchten (MVG) hydraulic parameters (alpha, n, K-s) from
                      TDR measurements obtained under falling head infiltration,
                      we concluded that the coupled approach is more practical and
                      less uncertain than the sequential approach. In particular,
                      the coupled inversion approach allows to simultaneously
                      monitor ponding depth and water infiltration, which avoids
                      the laborious task of manually measuring the ponding depths
                      and can thus enable rapid estimation of the soil hydraulic
                      parameters for multiple locations through automatic
                      measurements of ponded infiltration for multiple rings
                      through TDR multiplexing.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Soil Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000290856500002},
      doi          = {10.2136/sssaj2010.0285},
      url          = {https://juser.fz-juelich.de/record/15981},
}