HR: 0800h
AN: H51A-0346    [Abstracts]
TI: Flow Dimension Analysis of Pumping Tests for use in Hydraulic Tomography
AU: * Bowman, D O
EM: DoBowman@aol.com
AF: The University of Mississippi, 118 Carrier Hall, Oxford, MS 38677 United States
AU: Holt, R M
EM: rmholt@olemiss.edu
AF: The University of Mississippi, 118 Carrier Hall, Oxford, MS 38677 United States
AU: Roberts, R M
EM: rmrober@sandia.gov
AF: Sandia National Laboratories, 4100 National Parks Hwy, Carlsbad, NM 88220 United States
AB: The generalized radial flow approach is rarely used in hydraulic test analysis. Flow dimension of a hydraulic test can be described as the change in cross-sectional area of flow with respect to radial distance from the borehole of a hydraulic test and can be calculated using the second derivative of pumping-test drawdown versus log time. Assuming an initial flow area, we have developed a simple algorithm that generates geometries, or conduits, that correspond to arbitrary flow dimensions and have validated this approach through numerical pumping test simulations. We explore the effects of heterogeneous systems through interpretation of changes in flow dimension. Using pumping test data and extracted flow dimension, we are able to calculate aquifer characteristics, specifically effective transmissivity, and spatial distance of heterogeneities for simple geometric cases. We investigate the hypothesis that flow dimension can be used for tomographic characterization of aquifer geometry in simulated pumping test analysis.
DE: 1800 HYDROLOGY
DE: 1847 Modeling
SC: Hydrology [H]
MN: Fall Meeting 2005