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GEOSTATS: ANN: Preferential Pathway Identification by Simulated Annealing Paper available on web

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  • Upmanu Lall
    Please check this link http://pub.uwrl.usu.edu/~ulall/anneal/ to view the paper indicated below. The paper has been submitted to Water Resources Research
    Message 1 of 1 , May 8, 1998
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      Please check this link
      http://pub.uwrl.usu.edu/~ulall/anneal/
      to view the paper indicated below. The paper has been submitted to Water
      Resources Research




      Identifying Potential Preferential Paths for Subsurface Contaminant
      Transport Using
      Simulated Annealing

      Alaa Ibrahim Ali and Upmanu Lall
      Utah Water Research Lab. and Dept. of Civil and Environmental Eng.,
      Utah State University, Logan UT 84322-8200
      ABSTRACT

      Connected zones of high hydraulic conductivity in subsurface environments
      can constitute preferential pathways for contaminant transport and fluid
      flow. The
      identification of such pathways is important for well head protection,
      groundwater monitoring and capture system design for groundwater
      remediation. Since it is
      not practical to exhaustively sample the subsurface, the existence and
      probable extent and location of such paths must be inferred from available
      data. Bore hole
      logs are the primary source of subsurface data considered here. A
      stochastic simulator is used to generate realizations of subsurface soil
      attributes inferred from
      these data on to a lattice. Measures of connectivity between any two
      locations in the aquifer are introduced. These measures reflect potential
      travel time between
      lattice locations under an assumption of a unit hydraulic gradient along
      each candidate connected path. A preferential pathway between any two
      points in the
      aquifer is then defined as one with the highest degree of connectivity
      (i.e., lowest potential travel time). A simulated annealing algorithm is
      used to identify
      potential preferential pathways between any two prescribed points in the
      aquifer for each realization. Simulated annealing proceeds by generating a
      sequence of
      random connected paths between the two points of interest. The objective
      function is evaluated as the potential travel time for each candidate path.
      Preferential
      pathways are identified as connected paths with minimal potential travel time.



      ___________________________________________________________________
      Upmanu Lall
      Professor, Civil and Environmental Engineering
      Associate Director, Utah Water Research Laboratory
      Utah State University
      Logan UT 84322-8200
      ___________________________________________________________________
      e-mail: ulall@...
      Web: http://grumpy.usu.edu/~FALALL/ulall.html
      http://publish.uwrl.usu.edu/faculty/lall.html
      ___________________________________________________________________
      Phone: 801-797-3184 FAX: 801-797-3663
      ___________________________________________________________________


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