Predicting the depth of penetration of DNAPLs in fractured aquifers: Facing the uncertainties

摘要

We are now facing the legacy of over half a century of groundwater pollution resulting from the release of dense non-aqueous phase liquids (DNAPLs), in particular the chlorinated solvents, to the subsurface. Only recently has the severity and scale of the contamination been made apparent. The rapid migration of DNAPLs is promoted by the presence of preferential pathways such as fractures, which are ubiquitous in the majority of bedrock aquifers. However, heterogeneity, inherent at a range of scales in all fractured rocks, suggests that accurate prediction of the fate of DNAPLs will be limited by our abilities to measure, interpret and represent key fracture parameters. The broader objectives of the study are to provide results that will enhance risk assessment, focus remediation technologies, and develop better management of groundwater resources.