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Identifying aquifer type in fractured rock aquifers using harmonic analysis
1School of Geology, Oklahoma State University, 105 Noble Research Center, Stillwater, OK 74078, USA. khayyun.rahi@okstate.edu
Ground Water
|April 3, 2012
Summary
Harmonic analysis of water levels accurately determines aquifer type (unconfined, semi-confined, or confined) cost-effectively. This depth-dependent method reveals aquifer conditions in complex systems, improving hydraulic mapping.
Area of Science:
- Hydrogeology
- Geophysics
Background:
- Traditional methods for determining aquifer type (e.g., pumping tests) are costly, complex, and can yield inconclusive results.
- Understanding aquifer type is crucial for hydraulic mapping, especially in complex systems like fractured rock aquifers.
- Earth tides and barometric pressure variations are known to influence water levels in various aquifer types.
Purpose of the Study:
- To develop and validate a cost-effective method for determining aquifer type.
- To assess the influence of earth tides and barometric pressure on water levels to identify aquifer characteristics.
- To evaluate the depth-dependent nature of aquifer conditions within a thick carbonate aquifer.
Main Methods:
- Utilized harmonic analyses of water-level fluctuations from nine wells in the Arbuckle-Simpson aquifer, Oklahoma.
- Evaluated the influence of earth tides and barometric pressure variations using signal identification techniques.
- Correlated water-level responses with depth to assess changes in aquifer hydraulic properties.
Main Results:
- Harmonic analysis successfully identified different aquifer types (confined, semi-confined, unconfined) within the study area.
- Aquifer type was found to be depth-dependent, with confined conditions increasing with depth.
- Despite uniform lithostratigraphy, distinct hydraulic responses indicated varying aquifer conditions.
Conclusions:
- Harmonic analysis of water-level fluctuations is an accurate and low-cost method for determining aquifer type.
- This technique provides valuable insights into the hydraulic behavior of complex aquifer systems.
- The depth-dependent nature of aquifer conditions was clearly demonstrated, enhancing hydrogeological models.
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