ADVECTIVE-DIFFUSIVE CONTAMINANT MIGRATION IN UNSATURATED SAND AND GRAVEL

The authors present a method for estimating the diffusion coefficients for chloride and sodium in unsaturated coarse sand and fine gravel. The method is based on parameters derived from saturated diffusion tests conducted for similar material. To test the method, the authors compare the observed and predicted diffusion profiles through unsaturated soil. The method is a good predictor of the advective-diffusive migration of chloride and sodium through a two-layer soil system consisting of a compacted clayey silt underlain by an unsaturated fine gravel. The authors conclude that, over the range of conditions examined, existing solute transport theory along with the proposed procedure for estimating the unsaturated diffusion coefficients can adequately predict chloride and sodium diffusion through unsaturated coarse sand and fine gravel. The theory and procedure can predict advective-diffusive transport through a compacted clayey layer and underlying unsaturated fine gravel as well.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 965-975
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00730034
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 31 1997 12:00AM