HR: 11:05h
AN: B31F-04    [PDF]
TI: Modeling 3-D Coupled Variably Saturated Flow, Reactive Biogeochemical Transport, and Heat Transfer under Complex and Mixed Reaction Systems
AU: * Sun, J
EM: sjt_snoopy@hotmail.com
AF: University of Central Florida, 4000 Central Florida, Orlando, FL 32816 United States
AU: Yeh, G
EM: gyeh@mail.ucf.edu
AF: University of Central Florida, 4000 Central Florida, Orlando, FL 32816 United States
AB: A three dimensional numerical model HYDROGEOCHEM 5.0 has been developed to study the coupled variably saturated subsurface flow, reactive biogeochemical transport, and heat transfer under complex (multiple reaction types, including aqueous complexation, adsorption-desorption, ion-exchange, redox, precipitation-dissolution, and acid-base reaction) and mixed (equilibrium and kinetic) reaction systems. Theoretical bases and numerical implementations are summarized and three designed examples are presented. An complicated but realistic advective-dispersive-reactive transport problem is concerned in Example 1, in which three different schemes are compared in solving the governing transport equation: (1) FEM (Finite Element Method) on advective form; (2) Hybrid Lagrangian-Eulerian FEM for interior elements plus FEM on advective form for boundary elements; (3) Hybrid Lagrangian-Eulerian FEM. Example 2 focuses on employing different approaches to couple hydrologic transport and biogeochemical reactions: (1) Fully implicit iteration approach; (2) operator splitting approach; and (3) predictor-corrector approach. Example 3 is designed to explore the significance of the heat transfer on reactive chemical transport. This example will demonstrate how temperature affects the chemical transport as a consequence of changing the equilibrium constants; also in this example is the comparison of the simulation results under different heat transfer conditions. Keywords: Numerical Model; Groundwater; Reactive chemical transport; Heat transfer
DE: 1099 General or miscellaneous
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1899 General or miscellaneous
SC: Biogeosciences [B]
MN: 2003 Fall Meeting