HR: 0830h
AN: H21C-06    [Abstracts]
TI: A Methodology for Solute Transport in Unsteady, Nonuniform Streamflow with Subsurface Interaction
AU: * Lin, Y
EM: lin@ecs.umass.edu
AF: University of Massachusetts, 18 Marston Hall, Amherst, MA 01003 United States
AU: Chang, M
EM: gtg890e@mail.gatech.edu
AF: Georgia Institute of Technology, School of Physics, Atlanta, GA 30332 United States
AU: Medina, M A
EM: miguel.medina@duke.edu
AF: Duke University, Box 90287 Department of Civil & Environmental Engineering, Durham, NC 27708-0287 United States
AB: An advection-dispersion-reaction model can generally be used to describe one-dimensional stream solute transport if the flow is steady and if the channel is smooth and uniform. When applied to unsteady, nonuniform streamflows, a model based on the Fickian analogy needs to be modified to account for the temporal and spatial variation of the cross-sectional area of the stream channel. In this paper, we explore this topic with a simple approximation method as well as an elaborate one, both of which are incorporated into a conjunctive stream-aquifer transport model and are applied to a hypothetical stream-aquifer setting. The simple method, while easier to implement, displays a persistent pattern of error in simulation results. The elaborate method, while accurate in computation, results in a more complicated model and requires extensive procedures to overcome the efficiency problem when simulating complex stream-aquifer interactions. However, by coupling the latter with the adaptive stepsize control for the Runge-Kutta method in a conjunctive stream-aquifer model, it not only greatly improves model efficiency but also results in more realistic modeling than previously reported.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1871 Surface water quality
DE: 1878 Water/energy interactions
SC: Hydrology [H]
MN: 2005 Joint Assembly