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SUMMARY:Modeling Nonequilibrium Flow and Contaminant Transport Processes i
 n Soils and Groundwater
DTSTART:20100517T161500
DTSTAMP:20260511T081210Z
UID:4406964acd0918a3c93289632fc8c54320f9ef4bca6a1e0b91b9658d
CATEGORIES:Conferences - Seminars
DESCRIPTION:van Genuchten\, Rien (Federal University of Rio de Janeiro\, B
 R)\nAccurate simulation of contaminant transport processes in the subsurfa
 ce remains a major challenge in many science and engineering applications.
  In this presentation we review a broad range of dual-porosity and dual-pe
 rmeability formulations for modeling nonequilibrium or preferential fluid 
 flow and contaminant transport in the subsurface. We focus especially on t
 ransport processes in the variably-saturated vadose zone between the soil 
 surface and the groundwater table. One effective modeling approach for flo
 w is to use composite functions for the unsaturated hydraulic conductivity
  to account for the separate effects of macropores (fractures) and micropo
 res (matrix pores)\, and to combine this approach with a nonequilibrium fo
 rmulation for solute transport that assumes the presence of immobile water
 . Several example problems are given to illustrate the potentially importa
 nt effects of preferential flow on contaminant transport at the field scal
 e. One application concerns pesticide transport in a tile-drained field fo
 r which only limited data were available for model calibration. A second a
 pplication involves the long-term environmental fate of a radionuclide dec
 ay chain released from a mining installation in Amazonia processing ore co
 ntaining natural occurring radioactive materials.
LOCATION:GR B3 30
STATUS:CONFIRMED
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