HR: 0800h
AN: H11E-0332    [Abstracts]
TI: Coupling Flow and Thermal and Reactive Geochemical Transport
AU: * Yeh, G
EM: gyeh@mail.ucf.edu
AF: Gour-Tsyh Yeh, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816 United States
AB: The couplings among fluid flows, thermal transport, geochemical reactions, advective and diffusive transport of solutes in fractured media or soils, and changes in hydraulic properties due to precipitation and dissolution along fractures and rock matrix are important for understanding interplays between fluid flows and dynamic transport processes. This paper describes the development and demonstrative applications of a mechanistic-based numerical model of coupled fluid flow and thermal and reactive geochemical transport, including both fast and slow reactions, in variably saturated media. Theoretical bases, numerical implementations, and two numerical experiments using the model will be presented. The first example deals with the effect of precipitation-dissolution on fluid flow and matrix diffusion in a two-dimensional fractured media. Because of the precipitation and decreased diffusion of solute from the fracture into the matrix, retardation in the fractured medium is not as large as the case wherein interactions between geochemical reactions and transport are not considered. The second example focuses on a complicated but realistic advective-dispersive-reactive transport problem. This example exemplifies the need for innovative numerical algorithms to solve problems involving stiff geochemical reactions.
DE: 1899 General or miscellaneous
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1099 General or miscellaneous
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting