Case Study of the Sheahan Wellfield Using Field Data to Determine Localized Leakage Areas
Publication: Journal of Hydrologic Engineering
Volume 13, Issue 11
Abstract
Source water protection zones are not easily determined for semiconfined aquifers with highly localized areas of leakage from overlying shallow aquifers. This research is a companion case study to a theoretical study detailing the inverse modeling of aquifer mixing zones using age-distribution models. Where the first study detailed the capabilities of inverse age-distribution modeling given various sets of environmental tracer data and prior information, this study demonstrates the successful application of the technique to a real-world problem with a robust conceptual model verified in the current literature. The case study presented here considers a hydrogeologic setting in the northern Mississippi Embayment where highly localized leakage features exist between a shallow alluvial aquifer and the Memphis aquifer. Geochemical analyses, environmental, and radiochemical tracers have been used to develop and verify a conceptual model of the flow system at the Sheahan Wellfield in Memphis, Tenn. This study used inverse age-distribution modeling of tritium and helium-3 at multiple wellheads to determine the most highly probable location of a near field leakage source that is impacting wellheads. The method was used to identify the most likely location of the leakage site, and to identify an area at most risk for wellhead management considerations.
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Acknowledgments
The research conducted for this paper was funded by the Ground Water Institute at The University of Memphis. The writers wish to express their gratitude to the Ground Water Institute and its funding partners for making this work possible.
References
Bayer, R., Schlosser, P., Bőnisch, G., Rupp, H., Zaucker, R., and Zimmer, G. (1989). “Performance and blank component of a mass spectrometric system for routine measurement of helium isotopes and tritium by the 3He ingrowth method.” Sitzungsberichte der Heidelberger Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse, 5, Anhandlung, Springer, Berlin, 240–279.
Brahana, J. V., and Broshears, R. E. (2001). “Hydrogeology and ground-water flow in the Memphis and Fort Pillow aquifers in the Memphis area, Tennessee.” U.S. Geological Survey Water-Resources Investigations Rep. No. 89-4131, Nashville, Tenn.
Brahana, J. V., Parks, W. S., and Gaydos, M. W. (1987). “Quality of water from freshwater aquifers and principal well fields in the Memphis area, Tennessee.” U.S. Geological Survey Water Resources Investigations Rep. No. 87-4052, Nashville, Tenn.
Clarke, W. B., Jenkins, W. J., and Top, Z. (1976). “Determination of tritium by mass spectrometric measurement of 3He.” Int. J. Appl. Radiat. Isot., 27, 515–522.
Cross, B. (1989). “Tritium deposition data-access program.” DEP.BAS, U.S. Geological Survey, Reston, Va.
Gentry, R. W., Ku, T.-L., Luo, S., Todd, V., Larsen, D., and McCarthy, J. (2006). “Resolving aquifer behavior near a focused recharge feature based upon synoptic wellfield hydrogeochemical tracer results.” J. Hydrol., 323(N1–4), 387–403.
Gentry, R. W., Larsen, D., and Ivey, S. (2003). “Efficacy of genetic algorithm to investigate small scale aquitard leakage.” J. Hydraul. Eng., 129(7), 527–535.
Graham, D. D., and Parks, W. S. (1986). “Potential for leakage among principal aquifers in the Memphis Area, Tennessee.” U.S. Geological Survey Water-Resources Investigations Rep. No. 85-4295, Memphis, Tenn.
Ground Water Institute (GWI). (2001). “An investigation to identify sources and quantities of modern recharge to the Memphis aquifer in the Sheahan well field in Shelby County, Tennessee.” Final Rep. for TNWRRC Project, Univ. of Memphis, Memphis, Tenn.
International Atomic Energy Agency (IAEA). (2001). “Global network of isotopes in precipitation. The GNIP database.” Hatteras, N.C. dataset, United States Geological Survey, Menlo Park, Calif., ⟨http://www.naweb.iaea.org/napc/ih/IHS_resources_ISOHIS2.html⟩.
Ivey, S., Gentry, R., Larsen, D., and Anderson, J. (2002). “A preliminary framework for the use of environmental tracers to determine aquifer vulnerability.” Proc., 12th Annual Tennessee Water Resources Symp., Tennessee American Water Resources Association, Nashville, Tenn.
Ivey, S. S. (1997). “The use of barium as a natural tracer for leaky aquifers.” Master’s thesis, Univ. of Memphis, Memphis, Tenn.
Ivey, S. S., Gentry, R. W., Larsen, D., Anderson, J. L. (2008). “Inverse application of age-distribution modeling using environmental tracers / .” J. Hydrol. Eng., 134(11), 1002–1010.
Larsen, D., Gentry, R. W., Ivey, S., Solomon, K., and Harris, J. (2002). “Groundwater leakage through a leaky confining unit beneath a municipal well field, Memphis, Tennessee, USA.” Proc., GeoProc2002, Wiley-VCH, Weinheim.
Larsen, D., Gentry, R. W., and Solomon, D. K. (2003). “The geochemistry and mixing of leakage in a semi-confined aquifer at a municipal well field, Memphis, Tennessee, USA.” Appl. Geochem., 18(7), 1043–1063.
Larsen, D., Gentry, R. W., Waldron, B., Ivey, S., Hudgins, S., Salyers, M., and Jones, A. (2001). “Variations in water quality and tritium in the Sheahan and Morton well fields, Memphis, Tennessee, USA.” Proc., 11th Annual Tennessee Water Resources Symp., Tennessee American Water Resources Association, Nashville, Tenn., 1A1–1A7.
Maloszewski, P., and Zuber, A. (1983). “Theoretical possibilities of the H-3-He-3 method in investigations of groundwater systems.” Catena, 10(3), 189–198.
Maloszewski, P., and Zuber, A. (1996). “Lumped parameter models for the interpretation of environmental tracer data.” Manual on mathematical models in isotope hydrogeology, IAEA-TECDOC-910, Vol. 28, No. 6, IAEA, Vienna, Austria.
Maloszewski, P., and Zuber, A. (2002). “Manual on lumped parameter models used for the interpretation of environmental tracer data in groundwaters.” Use of isotopes for analyses of flow and transport dynamics in groundwater systems. Results of a coordinated research project 1996-1999, International Atomic Energy Agency, Vienna, Austria.
Michel, R. L. (1989). “Tritium deposition in the continental United States, 1953–83.” U.S. Geological Survey Water-Resources Investigations Rep. No. 89-4072, Reston, Va.
Nyman, D. J. (1965). “Predicted hydrologic effects of pumping from the Lichterman wellfield in the Memphis Area, Tennessee.” U.S. Geological Survey Water Supply Paper No. 1819-B, Washington, D.C.
Parks, W. S. (1990). “Hydrogeology and preliminary assessment of the potential for contamination of the Memphis aquifer in the Memphis area, Tennessee” U.S. Geological Survey Water Resources Investigations Rep. No. 90-4092, Washington, D.C.
Parks, W. S., and Carmichael, J. K. (1990). “Geology and ground-water resources of the Memphis sand in western Tennessee.” U.S. Geological Survey Water-Resources Investigations Rep. No. 88-4182, Memphis, Tenn.
Plummer, L. N., Prestemon, E. C., and Parkhurst, D. L. (1994). “An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH.” U.S. Geological Survey Water-Resources Investigations Rep. No. 91-4078, Reston, Va.
Solomon, D. K., and Cook, P. G. (2000). “3H and 3He.” Environmental tracers in subsurface hydrology, P. G. Cook and A. L. Herczeg, eds., Kluwer, Boston, 397–424.
United States Environmental Protection Agency (USEPA). (1993). “Guidelines for delineation of wellhead protection areas.” EPA 440-5-93-00, Office of Water, Office of Ground Water Protection, Washington, D.C.
Wells, F. G. (1933) “Ground water resources of Western Tennessee” U.S. Geological Survey Water-Supply Paper No. 656, Washington, D.C.
Information & Authors
Information
Published In
Journal of Hydrologic Engineering
Volume 13 • Issue 11 • November 2008
Pages: 1011 - 1020
Copyright
© 2008 ASCE.
History
Received: Sep 13, 2007
Accepted: Jun 4, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
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