HR: 0830h
AN: H51A-07    [Abstracts]
TI: Flow Dimension Analysis of Pumping Tests in Indicator Fields
AU: * Bowman, D O
EM: DoBowman@aol.com
AF: The University of Mississippi, Dept of Geology and Geological Engineering 118 Carrier Hall, University, MS 38677 United States
AU: Holt, R M
EM: rmholt@olemiss.edu
AF: The University of Mississippi, Dept of Geology and Geological Engineering 118 Carrier Hall, University, 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. The 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. Using this relationship, 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. Flow dimension can be estimated from the second derivative of pumping-test drawdown versus log time. To investigate geometry effects on flow dimension, we look at transmissivity conduits and indicator fields of varying complexity. We believe constant non-radial flow dimensions, commonly observed in field data, may result from variations in the transmissivity of the conduit and bounding media. Analysis has shown that flow dimension varies with indicator field complexity and/or transmissivity contrast. We investigate the hypothesis that flow dimensions in complex indicator fields may be affected not only by transmissivity contrasts, but also by the interconnectivity of the field.
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2005 Joint Assembly