HR: 1340h
AN: H33F-0521    [Abstracts]
TI: A New and Efficient Space-time Sub-discretizaton Methodology for Concurrent Multi-scale Groundwater Modeling
AU: * Guvanasen, V
EM: dua@hgl.com
AF: HydroGeoLogic, Inc, 1155 Herndon Parkway, Suite 900, Herndon, VA 20170 United States
AU: Park, Y
EM: yj2park@sciborg.uwaterloo.ca
AF: University of Waterloo, 200 University Avenue, West , Waterloo, Ont N2L 3G1 Canada
AU: Sudicky, E
EM: sudicky@sciborg.uwaterloo.ca
AF: University of Waterloo, 200 University Avenue, West , Waterloo, Ont N2L 3G1 Canada
AB: Multi-scale simulations in groundwater often necessitate the use of successive telescopic discretizations, each designed for a given spatial scale. The use of telescopic grids or meshes resulting from such a discretization procedure requires that successive simulations in different scales be carried out, starting with the one covering the largest spatial scale. Using this procedure, boundary conditions for successively smaller-scale models must be derived from larger-scale models. This type of simulation is computationally demanding, labor-intensive, and time-consuming. To overcome these problems, a new methodology for sub-discretization has been developed. This methodology is relatively flexible, allowing a given three-dimensional hexahedral block or element to be sub-discretized with infinite combinations of number of subdivisions in three dimensions. For transient simulations in multi-scale environment, there may be hydrogeologic/anthropogenic features such as fractures or time-varying extraction (or injection) points that cause groundwater pressure or solute concentration to change rapidly with time locally. It is apparent therefore that fine temporal discretization should be confined to the areas where rapid changes are expected. To overcome the problem of non-uniform concurrent location-dependent time discretization requirements, a temporal sub-discretization with virtual nodes to account for local solutions at different time levels where finer time discretization is necessary has been developed. The two methodologies above can be used separately or synergistically combined to provide a powerful solution method for multi-scale simulations. The newly developed methodology of space and time sub-discretization will be presented along with application examples, results, and discussions.
DE: 1829 Groundwater hydrology
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting