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@ARTICLE{Hrdt:59389,
      author       = {Hördt, A. and Blaschek, R. and Kemna, A. and Zisser, N.},
      title        = {{H}ydraulic conductivity estimation from induced
                      polarisation data at the field scale - the {K}rauthausen
                      case history},
      journal      = {Journal of applied geophysics},
      volume       = {62},
      issn         = {0926-9851},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-59389},
      pages        = {32 - 46},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Recently, encouraging results have been obtained to
                      estimate hydraulic conductivity in unconsolidated sediments
                      from induced polarisation (IP) measurements. The work
                      focussed on laboratory experiments in order to establish
                      semi-empirical relationships between complex electrical
                      conductivity and hydraulic parameters. Although field
                      studies are certainly important to evaluate the feasibility
                      of the method in practice, only a limited number of case
                      histories have been reported. We carried out an IP survey at
                      the Krauthausen hydrogeological test site in Germany.
                      Multifrequency data were recorded along two profiles with a
                      dipole-dipole configuration and 2 in electrode spacing. The
                      data were inverted with a 2-D inversion code to obtain
                      images of conductivity magnitude and phase for each
                      frequency. We used a novel focussing regularisation scheme
                      that does not suppress sharp boundaries and yields realistic
                      images of the subsurface. The gross structural features
                      compare well with the known lithology, which consists of an
                      approx. 9 in thick sand/gravel aquifer over fine sands and a
                      thin clay layer which constitutes the base at approx. I I in
                      depth. From the complex electrical conductivity distribution
                      we calculate hydraulic conductivity estimates using the
                      empirical equations suggested by Bbmer et al. [Borner, F.
                      D., Schopper J. R., Weller, A., 1996. Evaluation of
                      transport and storage properties in the soil and groundwater
                      zone from induced polarisation measurements. Geophys. Prosp.
                      44, 583-601] and by Slater and Lesmes [Slater, L. D.,
                      Lesmes, D. P., 2002a. Electric hydraulic relationships
                      observed for unconsolidated sediments. Water Res. Research,
                      3 8 (10), doi:10.1029/2001WR001075] and compare the results
                      with values obtained from grain size data at two boreholes.
                      The Bbmer model yields hydraulic conductivities in the same
                      order of magnitude as the grain size data, whereas the
                      Slater and Lesmes model substantially underestimates
                      hydraulic conductivities. We also compare the specific inner
                      surface estimated from our IP data with values obtained from
                      BET measurements at the two borehole locations. In this
                      case, we observe a reasonable agreement with both the Borner
                      and the Slater and Lesmes equations. Our results constitute
                      an encouraging example where reasonable estimates of
                      hydraulic parameters are obtained at the field scale. (C)
                      2006 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geosciences, Multidisciplinary / Mining $\&$ Mineral
                      Processing},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000246741300003},
      doi          = {10.1016/j.jappgeo.2006.08.001},
      url          = {https://juser.fz-juelich.de/record/59389},
}