Modeling of DNAPL spreading in heterogeneous variable aperture fractures
2009 (English)In: Geophysical Research Abstract Vol. 11, EGU General Assembly 2009, 2009, 10221- p.Conference paper (Other academic)
The design of effective remediation schemes for dense non-aqueous phase liquids (DNAPLs) in fractured rocksrequires a fundamental understanding of their multiphase spreading and dissolution processes in these highly heterogeneoussystems. Stochastic heterogeneity is present both at the level of individual fractures and at the levelof fracture networks, and the processes of DNAPL spreading in these systems are not well understood. This workinvestigates the multiphase spreading and immobilization of chlorinated solvents in variable aperture single fracturesby means of numerical modeling. Multiphase simulation code iTOUGH2/T2VOC is used. Log-normallydistributed and spatially correlated aperture fields are generated and locally valid cubic law is assumed to relatethe variable aperture to the variable permeability. Hysteretic Brooks-Corey-Burdine type of capillary pressuresaturation-relative permeability relationships obtained by experimental study of Reitsma and Kueper (Water ResourcesResearch, 30 (1994): 865-878) are adopted and scaled with regard to interfacial tensions and local permeabilityaccording to Leverett J function. The effect of fracture aperture characteristics and correlation length aswell as fracture dipping angle on DNAPL spreading pathway and residual distribution is examined. Implicationsfor upscaling the observed behavior to fracture network systems are discussed.
Place, publisher, year, edition, pages
2009. 10221- p.
Oceanography, Hydrology, Water Resources
Research subject Hydrology
IdentifiersURN: urn:nbn:se:uu:diva-120405OAI: oai:DiVA.org:uu-120405DiVA: diva2:303281
EGU General Assembly 2009, Vienna, Austria 19 – 24 April 2009