Bradley A. Birkelo received a B.S. degree in Geology in 1982 and a B.S. degree in Geophysics in 1983 from the University of Minnesota. From 1984 to 1985 he worked as a Hydrologist for the U.S. Geological Survey in Trenton, New Jersey. He worked as a graduate research assistant for the Kansas Geological Survey from 1985 to 1987, and completed his M.S. degree in Geology with emphasis in Geophysics in 1987 at the University of Kansas.
Seismic Reflection Study of a Shallow Aquifer During a Pumping Test
Article first published online: 21 MAR 2006
Volume 25, Issue 6, pages 703–709, November 1987
How to Cite
Birkelo, B. A., Steeples, D. W., Miller, R. D. and Sophocleous, M. (1987), Seismic Reflection Study of a Shallow Aquifer During a Pumping Test. Groundwater, 25: 703–709. doi: 10.1111/j.1745-6584.1987.tb02211.x
Discussion open until May 1, 1988.
- Issue published online: 21 MAR 2006
- Article first published online: 21 MAR 2006
- Received October 1986, revised June 1987, accepted June 1987.
Seismic reflection surveys were used to follow the drawdown in a shallow aquifer during a pumping test. Using severe analog low-cut filters and 1/4-m geophone spacings, 335 Hz reflections were obtained from the top of the saturated zone 2.7 m deep. The reflections moved down in time as the saturated zone dropped in response to pumping. The dominant frequency and bandwidth both dropped during pumping indicating a more diffuse reflecting boundary. Slight pullups of reflectors at specific locations on the CDP sections may indicate a higher elevation of the capillary fringe and therefore finer sediments in those locations. Other potential applications of this technique include mapping cones of depression and detecting and delineating perched-water tables.