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@ARTICLE{Vanderborght:437,
      author       = {Vanderborght, J. and Vereecken, H.},
      title        = {{E}stimation of local scale dispersion from local
                      breakthrough curves during a tracer test in a heterogeneous
                      aquifer : the {L}agrangian approach},
      journal      = {Journal of contaminant hydrology},
      volume       = {54},
      issn         = {0169-7722},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-437},
      pages        = {141 - 171},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The local scale dispersion tensor, D-d, is a controlling
                      parameter for the dilution of concentrations in a solute:
                      plume that is displaced by groundwater flow in a
                      heterogeneous aquifer. In this paper, we estimate the local
                      scale dispersion froth time series or breakthrough curves,
                      BTCs, of Br- concentrations that were measured at several
                      pints in a fluvial aquifer during a natural gradient tracer
                      test at Krauthausen. Locally Measured BTCs were
                      characterized by equivalent convection dispersion
                      parameters: equivalent velocity, nu(eq)(x) and expected
                      equivalent dispersivity, <lambda(eq)(x)>. A Lagrangian
                      framework was used to approximately predict these equivalent
                      parameters in terns of the spatial covariance of log(e)
                      transformed conductivity and the local scale dispersion
                      coefficient.The approximate Lagrangian theory illustrates
                      that <lambda(eq)(x)> increases with increasing travel
                      distance and is much larger than the local scale
                      dispersivity, lambda(d). A sensitivity analysis indicates
                      that <lambda(eq)(x)> is predominantly determined by the
                      transverse component of the local scale dispersion and by
                      the correlation scale of the hydraulic conductivity in the
                      transverse to flow direction whereas it is relatively
                      insensitive to the longitudinal component of the local scale
                      dispersion. By comparing predicted <lambda(eq)(x)> for a
                      range of D-d values with <lambda(eq)(x)> obtained from
                      locally measured BTCs, the transverse component of D-d,
                      D-dT, was estimated. The estimated transverse local scale
                      dispersivity, lambda(dT) = D-dT/U-1 (U-1 = mean advection
                      velocity) is in the order of 10(1)-10(2) mm, which is
                      relatively large but realistic for the fluvial gravel
                      sediments at Krauthausen. (C) 2002 Elsevier Science B.V. All
                      rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-IV},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Environmental Sciences / Geosciences, Multidisciplinary /
                      Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000173429700008},
      doi          = {10.1016/S0169-7722(01)00143-7},
      url          = {https://juser.fz-juelich.de/record/437},
}