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@INPROCEEDINGS{Vanderborght:185678,
      author       = {Vanderborght, Jan and Engelhardt, Irina and Herbst, Michael
                      and Hardelauf, Horst and van der Kruk, Jan and Klotzsche,
                      Anja and Güting, Nils and Vereecken, Harry and Diels, Jan},
      title        = {{I}nterpretation of groundwater concentration measurements
                      using flow and transport models.},
      reportid     = {FZJ-2014-07103},
      year         = {2014},
      abstract     = {Concentrations measurements in samples taken from
                      groundwater observation wells are used to monitor the
                      evolution of the groundwater quality. Groundwater monitoring
                      wells may be of interest to evaluate the impact of
                      agricultural practices on groundwater quality. However, a
                      direct interpretation of groundwater concentration
                      measurements is impaired by several factors. Land management
                      at the soil surface is uniform neither in space nor in time
                      leading to spatio-temporal imprints of management practices
                      on groundwater concentrations. In order to unravel these
                      imprints, groundwater flow and transport models are
                      indispensable. In this contribution, we discuss several
                      processes that should be considered when interpreting
                      groundwater concentration measurements in an observation
                      well with a certain filter depth and length. First, simple
                      analytical approaches that give a first impression about the
                      origin of the sampled groundwater and its age are discussed.
                      In their simplest form, these approaches consider only
                      advective transport in a uniform aquifer. Using numerical
                      flow and transport simulations, the impact of mixing
                      processes and heterogeneity of aquifer properties on
                      groundwater concentrations are presented in a second part.
                      Since numerical simulations of 3-D processes are
                      computationally expensive, analytical solutions of 3-D
                      transport equations or of first-order approximations of
                      stochastic transport equations are presented in a third
                      part.},
      month         = {Oct},
      date          = {2014-10-21},
      organization  = {7th European Modelling Workshop,
                       Vienna (Austria), 21 Oct 2014 - 23 Oct
                       2014},
      subtyp        = {Invited},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / 255 - Terrestrial Systems:
                      From Observation to Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/185678},
}