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@ARTICLE{Rahmati:889159,
      author       = {Rahmati, Mehdi and Vanderborght, Jan and Šimůnek, Jirka
                      and Vrugt, Jasper A. and Moret‐Fernández, David and
                      Latorre, Borja and Lassabatere, Laurent and Vereecken,
                      Harry},
      title        = {{S}oil hydraulic properties estimation from
                      one‐dimensional infiltration experiments using
                      characteristic time concept},
      journal      = {Vadose zone journal},
      volume       = {19},
      number       = {1},
      issn         = {1539-1663},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2021-00082},
      pages        = {e20068},
      year         = {2020},
      abstract     = {Many different equations ranging from simple empirical to
                      semi‐analytical solutions of the Richards equation have
                      been proposed for quantitative description of water
                      infiltration into variably saturated soils. The sorptivity,
                      S, and the saturated hydraulic conductivity, Ks, in these
                      equations are typically unknown and have to be estimated
                      from measured data. In this paper, we use so‐called
                      characteristic time (tchar) to design a new method, referred
                      to as the characteristic time method (CTM) that estimates S,
                      and Ks, from one‐dimensional (1D) cumulative infiltration
                      data. We demonstrate the usefulness and power of the CTM by
                      comparing it with a suite of existing methods using
                      synthetic cumulative infiltration data simulated by
                      HYDRUS‐1D for 12 synthetic soils reflecting different USDA
                      textural classes, as well as experimental data selected from
                      the Soil Water Infiltration Global (SWIG) database. Results
                      demonstrate that the inferred values of S and Ks are in
                      excellent agreement with their theoretical values used in
                      the synthetically simulated infiltration experiments with
                      Nash–Sutcliffe criterion close to unity and RMSE values of
                      0.04 cm h−1/2 and 0.05 cm h−1, respectively. The CTM
                      also showed very high accuracy when applied on synthetic
                      data with added measurement noise, as well as robustness
                      when applied to experimental data. Unlike previously
                      published methods, the CTM does not require knowledge of the
                      time validity of the applied semi‐analytical solution for
                      infiltration and, therefore, is applicable to infiltrations
                      with durations from 5 min to several days. A script written
                      in Python of the CTM method is provided in the supplemental
                      material.},
      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:000618773300062},
      doi          = {10.1002/vzj2.20068},
      url          = {https://juser.fz-juelich.de/record/889159},
}