Diagnostic hydrogeologic characteristics of a karst aquifer (Kentucky, USA)
- Permanent Link:
- Diagnostic hydrogeologic characteristics of a karst aquifer (Kentucky, USA)
- Series Title:
- Hydrogeology Journal
- Worthington, Stephen R. H.
- Publication Date:
- Subjects / Keywords:
- Carbonate Rocks ( local )
Conceptual Models ( local )
Karst ( local )
Numerical Models ( local )
Usa ( local )
- serial ( sobekcm )
- Laboratory experiments and numerical modeling have shown that dissolution in carbonate aquifers results in high-permeability channel networks. However, the lack of techniques to assess the extent and significance of these channel networks presents a major problem in characterizing carbonate aquifers. This problem was addressed by identifying the differences between two simulations (with and without channels) of the intensely studied limestone aquifer at Mammoth Cave (Kentucky, USA). Long-distance tracer-test results and spring discharges were used for assessing model accuracy as well as head measurements in wells. The channel simulation provided a much better calibration than the homogeneous porous-medium simulation and revealed five important differences: (1) convergent flow to large springs, (2) equipotentials forming troughs, (3) decreases in hydraulic gradient and (4) increases in hydraulic conductivity in a downgradient direction, and (5) substantial scaling effects. These five characteristics are also common in other carbonate aquifers and provide a means of identifying whether a carbonate aquifer is more similar to porous-medium or to karst-aquifer end members.
- Original Version:
- Hydrogeology Journal, Vol. 17 (2009-06-09).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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