HR: 0800h
AN: B11B-0411 [Abstracts]
TI: A Coupled Biogeochemical Reactive Transport Model in Bed Sediments and Water Column of Riverine Systems
AU: * Massoudieh, A
EM: amassoudieh@ucdavis.edu
AF: Department of Civil and Environmental Engineering, University of California, Davis, One
Shields ave. Engineering III, Davis, CA 95616, United States
AU: Bombardelli, F A
EM: fabombardelli@ucdavis.edu
AF: Department of Civil and Environmental Engineering, University of California, Davis, One
Shields ave. Engineering III, Davis, CA 95616, United States
AU: Sengor, S S
EM: SSSengor@ucdavis.edu
AF: Department of Civil and Environmental Engineering, University of California, Davis, One
Shields ave. Engineering III, Davis, CA 95616, United States
AU: Ginn, T R
EM: TRGinn@ucdavis.edu
AF: Department of Civil and Environmental Engineering, University of California, Davis, One
Shields ave. Engineering III, Davis, CA 95616, United States
AB:
ABSTRACT: A multi-scale, quasi-two-dimensional, biogeochemical reactive theoretical and numerical model is
presented, able to simulating sediment associated transport and transformations of contaminants in the water
column and bed sediments of riverine systems as a result of sediment associated transport, as well as
resuspension, deposition and burial. The model considers contaminant mass exchange between sediments
and aqueous phase both in benthic sediments and water column as a kinetically controlled process. It also takes
into account the effect of microbially-mediated redox reactions affecting the speciation of chemicals. Transport of
species in the sediments is modeled using a set of vertical one-dimensional sub-models which take into
account the reactive transport of chemicals, burial, sorption/desorption to/from the solid phase, and diffusive
transport of aqueous species. An innovative multi-time step approach is used to model the fully kinetic nonlinear
reaction terms using a non-iterative explicit method. This approach enables the model to handle fast and near-
equilibrium reactions without a significant increase in computational burden. Ongoing and planned applications
of this multiscale modeling strategy to two cases, multiple metal transport in Lake Coeur d'Alene, Idaho, and
Mercury Cycling in Walker Creek, California, are discussed.
DE: 0408 Benthic processes (4804)
DE: 0432 Contaminant and organic biogeochemistry (0792)
DE: 1847 Modeling
DE: 1861 Sedimentation (4863)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting