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@ARTICLE{Rahman:859504,
      author       = {Rahman, M. and Rosolem, R. and Kollet, Stefan and Wagener,
                      T.},
      title        = {{T}owards a computationally efficient free-surface
                      groundwater flow boundary condition for large-scale
                      hydrological modelling},
      journal      = {Advances in water resources},
      volume       = {123},
      issn         = {0309-1708},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2019-00356},
      pages        = {225 - 233},
      year         = {2019},
      abstract     = {Shallow groundwater is a critical component of the
                      terrestrial water cycle. It sustains baseflow in rivers,
                      supplies root zones with soil moisture during dry periods,
                      and directly influences the land-atmosphere exchange
                      processes. Nonetheless, the integration of groundwater into
                      large-scale hydrological models remains challenging. The
                      most detailed way of representing groundwater dynamics is to
                      incorporate three-dimensional, variably saturated flow
                      processes in the subsurface representation of hydrological
                      models. However, such detailed modelling is still a
                      challenge for global hydrological applications, mainly due
                      to its high computational demand. In this study, a
                      free-surface boundary condition called the Groundwater Flow
                      Boundary (GFB) is developed to represent groundwater
                      dynamics in a more computationally-efficient manner than the
                      full three-dimensional models do. We evaluate GFB using two
                      synthetic test cases, namely an infiltration experiment and
                      a tilted-v catchment, which focus on groundwater recharge
                      and discharge processes, respectively. The simulation
                      results from GFB are compared with a three-dimensional
                      groundwater flow model and with an over-simplified approach
                      using a free-drainage lower boundary condition to assess the
                      impact of our assumptions on model results. We demonstrate
                      that GFB is computationally more efficient compared to the
                      three-dimensional model with limited loss in model
                      performance when simulating infiltration and runoff
                      dynamics.},
      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:000453714000016},
      doi          = {10.1016/j.advwatres.2018.11.015},
      url          = {https://juser.fz-juelich.de/record/859504},
}