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@ARTICLE{Stingaciu:11759,
      author       = {Stingaciu, L.-R. and Weihermüller, L. and Haber-Pohlmeier,
                      S. and Stapf, S. and Vereecken, H. and Pohlmeier, A.},
      title        = {{D}etermination of pore size distribution and hydraulic
                      properties using nuclear magnetic resonance ({NMR})
                      relaxometry: a comparative study of laboratory methods (nur
                      online)},
      journal      = {Water resources research},
      volume       = {46},
      issn         = {0043-1397},
      address      = {Washington, DC},
      publisher    = {AGU},
      reportid     = {PreJuSER-11759},
      year         = {2010},
      note         = {Many thanks to Mathieu Javaux and Guido Rentmeesters from
                      UCL, Belgium, for access to and help with Hg intrusion
                      measurements; the DFG (project PO 746/2-1) for financial
                      support; Peter Blumler and Normen Hermes (FZ Juelich) for
                      help with the low-field setup; Anke Langen and Benedikt
                      Scharnagl (FZ Juelich, ICG4) for various retention function
                      measurements; and Claudia Walraf for BET measurements. The
                      reviewers of the paper are also acknowledged for their
                      useful comments and suggestions, which greatly helped us
                      understand and interpret our measurements.},
      abstract     = {[ 1] In this study, we evaluate the feasibility of using
                      nuclear magnetic resonance (NMR) relaxometry measurements to
                      characterize pore size distribution and hydraulic properties
                      in four porous samples with different texture and
                      composition. We compare NMR with two classical techniques
                      based on water retention and mercury intrusion measurements.
                      Both T-2 and T-1 NMR relaxation measurements at 6.47 MHz
                      were carried out for three saturated model samples (medium
                      sand, fine sand, and a homogenous sand/kaolin clay mixture)
                      and one saturated natural silt loam soil. Cumulative pore
                      size distribution functions and mean pore diameters were
                      calculated assuming average surface relaxivity parameters
                      and a cylindrical capillary model of the pores. The mean
                      pore diameters derived from T-2 and T-1 distributions as
                      well as the cumulative pore size distribution functions
                      agree satisfactorily with those derived from mercury
                      intrusion and retention curves. The observed deviations are
                      due to limitations of each method, sample preparation, and
                      sample composition. To evaluate the influence of the
                      variations observed in the hydraulic properties of the
                      samples, the pore size distribution functions were scaled
                      back to water retention functions, and the van Genuchten
                      hydraulic parameters were estimated by inversion using the
                      RETC software. The comparison shows that both T-2 and T-1
                      NMR relaxation measurements can be used to estimate pore
                      size distribution and mean pore diameter, as well as the
                      retention function and corresponding hydraulic properties.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4 / JARA-ENERGY / JARA-HPC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$ /
                      $I:(DE-82)080012_20140620$},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Limnology / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000283951500003},
      doi          = {10.1029/2009WR008686},
      url          = {https://juser.fz-juelich.de/record/11759},
}