HR: 0800h
AN: H11D-1306    [Abstracts]
TI: Field Scale Simulation of Uranium Reactive Transport for the Hanford 300 Area
AU: * Fang, Y
EM: yilin.fang@pnl.gov
AF: Pacific Northwest National Lab, PO Box 999, MSK9-36, Richland, WA 99352 United States
AU: Yabusaki, S
EM: yabusaki@pnl.gov
AF: Pacific Northwest National Lab, PO Box 999, MSK9-36, Richland, WA 99352 United States
AU: Waichler, S
EM: Scott.Waichler@pnl.gov
AF: Pacific Northwest National Lab, PO Box 999, MSK9-36, Richland, WA 99352 United States
AB: Subsurface flow and reactive transport at the Hanford 300 Area in Washington State is strongly driven by hourly changes in water levels in the Columbia River. The chemistries in the river and aquifer differ in pH, alkalinity and calcium, which have been shown to have a strong impact on uranium mobility. We use a two-dimensional multicomponent reactive transport model that incorporates laboratory-derived models of multirate kinetic sorption and equilibrium multicomponent surface complexation to assess the impact of 1) uranium transport from contaminated vadose zone sediments on the unconfined aquifer and 2) incursions of river water into the aquifer that alter uranium mobility. The model was also used to evaluate the role of sorption reaction kinetics on uranium transport in the aquifer during the small time scale transport process that results from the diurnal Columbia River stage fluctuations and the highly transmissive sediments.
DE: 1009 Geochemical modeling (3610, 8410)
DE: 1847 Modeling
DE: 1849 Numerical approximations and analysis
SC: Hydrology [H]
MN: Fall Meeting 2005