BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY: NAPL Contaminant  Dissolution in Heterogeneous Soils - Panos Niko
 lopoulos\, CUED
DTSTART:20071109T163000Z
DTEND:20071109T173000Z
UID:TALK8330@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Non Aqueous Phase Liquids\, such as chlorinated solvents (e.g.
  PCE\, TCE)\, impose a severe threat to the ground water environment and r
 eported health risk to humans via the food chain. Many researchers have an
 alysed and estimated the dissolution mechanisms of spilled NAPLs into grou
 nd water and the transport processes of the dissolved compounds. However\,
  there is still a lack of understanding on governing mechanisms and assess
 ment tools for the prediction of potential risk. Also\, the effect of fiel
 d heterogeneity on the dissolution processes has not been thoroughly inves
 tigated. \n\nThe present research addresses the need for understanding fur
 ther the role of heterogeneity in the transport and dissolution of hazardo
 us NAPL compounds in groundwater\, based on the NAPL mass flux approach. A
 n analytical solution of the simplified problem is provided and compared t
 o experimental and numerical data. An up-scaled form of the model is shown
  and compared to numerical results of aquifer scale. Taking into considera
 tion dispersion\, rate limiting and flow by-passing effects\, a quantitati
 ve assessment tool is formulated for evaluating the risk of NAPL contamina
 tion. The results show that NAPL spill architecture is a determinant param
 eter that controls contaminant mass flux through subsurface. In addition\,
  the velocity field around and through the source zone of contamination ha
 s a major effect on NAPL mass flux\, and is considered to play a vital rol
 e in the degree of contaminant discharge in realistic subsurface environme
 nts\, irrespective of whether the dissolution process is rate limited or n
 ot. Evidence from analytical\, numerical and experimental results suggests
  that the reduction of contaminant mass flux is mainly attributed to the e
 ffects of bypassing through regions of contrasting contaminant saturation.
 \n
LOCATION:Engineering Department - LR6
END:VEVENT
END:VCALENDAR