HR: 0800h
AN: H31A-0364    [Abstracts]
TI: Characterizing Dissolution Dynamics of Spatially Distributed Immiscible Liquid
AU: * Marble, J C
EM: jmarble@hwr.arizona.edu
AF: Department of Hydrology and Water Resources, The University of Arizona, Tucson, AZ 85721 United States
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: Department of Hydrology and Water Resources, The University of Arizona, Tucson, AZ 85721 United States
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, AZ 85721 United States
AB: Dissolution of immiscible liquid into the aqueous phase can be influenced by immiscible-liquid-water mass transfer, local-scale immiscible-liquid morphology and distribution, bypass flow, and dilution effects. The purpose of this work is to examine the effects of nonuniform distributions of immiscible liquid and porous-media heterogeneity on immiscible-liquid dissolution. The first set of experiments were conducted with an intermediate-scale flow cell, in which were positioned residual-saturated zones of dyed trichloroethene (TCE). The zones consisted of sand finer than the surrounding material. Additional experiments were conducted using a stainless-steel column. Finer-grain sand zones and porous ceramic cubes that contained residual TCE were emplaced within a courser sand matrix. Control experiments were conducted with homogeneous systems. Effluent samples were collected throughout the course of each experiment. A mathematical model was used to simulate transport. The results show that effluent concentration profiles are much more asymptotic for the systems wherein immiscible-liquid is entrapped within lower permeability zones.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting