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Andy Long

Andrew J. Long
Research Hydrologist
South Dakota Water Science Center
ajlong@usgs.gov
http://sd.water.usgs.gov/
U.S. Department of the Interior
U.S. Geological Survey
1608 Mountain View Rd.
Rapid City, SD 57702
605-394-3237
605-355-4523 FAX

Aquifers In Which Andy Has Conducted Research

Andy's Karst Publications

  • Long, A.J., and Valder, J.F. (2011) Multivariate analyses with end-member mixing to characterize groundwater flow--Wind Cave and associated aquifers: Journal of Hydrology, vol. 409, iss. 1-2, p. 315-327.
  • Long, A.J. (2009) Hydrograph separation for karst watersheds using a two-domain rainfall-discharge model: Journal of Hydrology, vol. 364, iss. 3-4, p. 249-256.
  • Long, A.J., and Gilcrease, P.C. (2009) A one-dimensional heat-transport model for conduit flow in karst aquifers: Journal of Hydrology, vol. 378, iss. 3-4, p. 230-239.
  • Long, A.J., and Putnam, L.D. (2009) Age-distribution estimation for karst groundwater--Issues of parameterizations and complexity in inverse modeling by convolution: Journal of Hydrology, vol. 376, iss. 3-4, p. 579-588.
  • Long, A.J., and Putnam, L.D. (2002) Flow-system analysis of the Madison and Minnelusa aquifers in the Rapid City area, South Dakota--conceptual model: USGS Water-Resources Investigations Report 2002-4185, 100 p.
  • Long, A.J., Sawyer, J.F., and Putnam, L.D. (2008) Environmental tracers as indicators of karst conduits in groundwater in South Dakota, USA: Hydrogeology Journal, vol. 16, iss. 2, p. 263-280.
  • Long, A.J., and Putnam, L.D. (2004) Linear model describing three components of flow in karst aquifers using 18O data: Journal of Hydrology, v. 296, p. 254-270.
  • Long, A.J., and Derickson, R.G. (1999) Linear systems analysis in a karst aquifer: Journal of Hydrology, vol. 219, p. 206-217.
  • Long, A.J., and Putnam, L.D. (2006) Translating CFC-based piston ages into probability density functions of ground-water age in karst: Journal of Hydrology, v. 330, p. 735-747.
  • Miller, L.D., and Long, A.J. (2006) Statistical analyses of hydrologic system components and simulation of Edwards aquifer water-level response to rainfall using transfer-function models, San Antonio region, Texas: USGS Scientific Investigations Report 2006-5131, 20 p.
  • Putnam, L.D., and Long, A.J. (2007) Analysis of Ground-Water Flow in the Madison Aquifer using Fluorescent Dyes Injected in Spring Creek and Rapid Creek near Rapid City, South Dakota, 2003-04: USGS Scientific Investigations Report 2007-5137, 29 p.

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