HR: 14:25h
AN: H13H-04    [Abstracts]
TI: Upscaling and Uncertainty of Reactive Transport in Heterogeneous Porous Media
AU: * Oates, P M
EM: pproof@mit.edu
AF: Civil and Environmental Engineering Massachusetts Institute of Technology, 77 Mass. Ave, Cambridge, MA 02138 United States
AU: Harvey, C F
EM: charvey@mit.edu
AF: Civil and Environmental Engineering Massachusetts Institute of Technology, 77 Mass. Ave, Cambridge, MA 02138 United States
AU: Meigs, L
AF: Visualization and Processes Laboratory, Geohydrology Department, Sandia National Laboratories , P.O. Box 5800, Albuquerque, NM 37185-0735 United States
AU: von Schwerin, C
AF: Visualization and Processes Laboratory, Geohydrology Department, Sandia National Laboratories , P.O. Box 5800, Albuquerque, NM 37185-0735 United States
AU: Zinn, B
AF: Civil and Environmental Engineering Massachusetts Institute of Technology, 77 Mass. Ave, Cambridge, MA 02138 United States
AU: Haggerty, R
AF: Dept. of Geosciences, Oregon State University, 104 Wilkinson Hall, Corvallis, OR 97331-5506 United States
AB: Reactive transport models based on the advection dispersion equation (ADE) are inaccurate because they use spatially averaged concentrations to simulate chemical reaction. Using these averaged concentrations for reactants assumes that solutes are completely mixed; i.e. the ADE-predicted concentration is uniform at the unresolved-scale. In reality, dispersion processes create chemical segregation and concentration distributions, and these unresolved scale distributions govern the amount of chemical reaction. Lab scale reactive transport experiments were run by digitally imaging colored dye tracers and colorimetric chemical reactions in clear heterogeneous porous media. Modeling the concentration mean and variance and assuming that reactants can be described by a joint beta distribution, gives a good description of the space-time evolution of our lab-scale product and reactant distributions. Currently, this approach works for instantaneous reactions with equally sorbing reactants.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting