HR: 1330h
AN: H22A-0905    [PDF]
TI: Modifications of the HYDRUS software packages for analyzing transient flow and solute transport experiments from centrifuge.
AU: * Simunek, J
EM: JSimunek@ussl.ars.usda.gov
AF: Dept. of Environ. Sci., University of California Riverside, Riverside, CA 92507 United States
AU: Mattson, E D
EM: MATTED@inel.gov
AF: Geosciences Research Department, INEEL, PO BOX 1625, Idaho Falls, ID 83415 United States
AU: Palmer, C D
EM: palmc@inel.gov
AF: Geosciences Research Department, INEEL, PO BOX 1625, Idaho Falls, ID 83415 United States
AB: HYDRUS-1D and HYDRUS-2D software packages (one- and two-dimensional numerical programs solving water flow and solute transport in variably-saturated porous media, respectively) were modified so that they can be used to simulate processes in a centrifugal field. These modified programs can be used to evaluate both steady-state and transient water flow and solute transport experiments carried out on soil or rock samples rotating in a centrifuge. The primary modification involves replacing the constant gravitational term in the Richards equation with a term that takes into account the rotational speed and the radius from the axis of rotation. The required modifications were made to codes for both direct and inverse analyses. The objective function in the inverse codes include both water flow and solute transport data. The soil hydraulic and/or solute transport parameters can be optimized either independently, sequentially, or simultaneously. Existing graphical user interfaces (HYDRUS-1D and 2D) can be used for preparing input and presenting output for the modified codes. A numerical technique used to obtain stable and mass conservative solutions is described. Several example of the program are presented and possible experiments are suggested.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2003 Fall Meeting