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@ARTICLE{Jelinkova:17432,
      author       = {Jelinkova, V. and Snehota, M. and Pohlmeier, A. and Van
                      Dusschoten, D. and Cislerova, M.},
      title        = {{E}ffects of entrapped residual air bubbles on tracer
                      transport in heterogeneous soil: {M}agnetic resonance
                      imaging study},
      journal      = {Organic geochemistry},
      volume       = {42},
      issn         = {0146-6380},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-17432},
      pages        = {991 - 998},
      year         = {2011},
      note         = {The research was supported by the Czech Science Foundation
                      Project No. 103/08/1552, by MZP CR SP/2E7/229/07 and by the
                      Grant Agency of the Czech Technical University in Prague,
                      Grant No. SGS10/146/OHK1/2T/11. We thank our colleague
                      Martina Sobotkova from CTU in Prague, for her help with the
                      experiments and two anonymous reviewers who contributed
                      helpful comments to this work.},
      abstract     = {Magnetic resonance imaging (MRI) was used to study the
                      process of infiltration and solute transport in an
                      undisturbed soil sample of coarse sandy loam. The sample was
                      subjected to the recurrent ponded infiltration (RPI)
                      experiment, which was carried out in order to assess the
                      changes in the entrapped air volume and its impact on steady
                      state flow rates and solute breakthrough. The main stages of
                      the first and second experimental RPI runs were monitored
                      using an MRI sequence that follows both water density and
                      magnetic relaxation. In a steady state stage of each
                      experimental run a nickel nitrate pulse was injected in
                      order to visualize the solute breakthrough. Effluent from
                      the sample was collected for chemical analysis and a
                      breakthrough curve of the nickel was constructed. To obtain
                      information about the soil structure and to reveal potential
                      preferential pathways, the soil sample was scanned using
                      computed tomography. The local nickel ion transport
                      breakthrough was evaluated from MR images in a series of
                      local observation points distributed along the selected
                      preferential pathways.The preferential flow instability
                      phenomenon with the emphasis on air bubble formation was
                      shown by detecting a $60\%$ decrease of the steady state
                      infiltration rate. The detailed analyses of MRI measurements
                      at observation points revealed air bubble formation,
                      producing a flow rate decrease accompanied by redirection of
                      nickel ion transport trajectories. By analyzing M0 maps it
                      was found that the volumetric water content decrease was
                      $2.2\%.$ (C) 2011 Elsevier Ltd. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3 / IBG-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)IBG-2-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000295215300014},
      doi          = {10.1016/j.orggeochem.2011.03.020},
      url          = {https://juser.fz-juelich.de/record/17432},
}