DRI / DIRECTORY / RON HERSHEY
Ron Hershey Profile Photo
Dr. Ron Hershey
Associate Research Scientist, Hydrogeology

Professional Interests

Dr. Hershey has extensive experience in ground-water sampling, ground-water monitoring network design and evaluation, and the use of aqueous thermodynamic geochemical models including PHREEQE, WATEQ, and NETPATH. Other research interests include the use of environmental isotopes and aqueous geochemistry in hydrogeologic studies of local and regional scale. He has used isotopic ratios of carbon to trace the movement of water through the hydrologic cycle and to delineate recharge zones in mountainous carbonate terrain. Dr. Hershey is also interested in the transport of radionuclides and hazardous materials in ground water.

Research Areas

  • Hydrology of the Unsaturated Zone
  • Contaminant Transport
  • Hydrogeological Controls on Availability and Quality of Ground Water
  • Global Environmental Hydrology
  • Integrated Watershed System

Education

DegreeInstitutionArea
Ph.D.University of Nevada, RenoHydrogeology
M.S.University of Nevada, Las VegasHydrogeology
B.S.University of New Mexico, AlbuquerqueGeology
B.A.Drake University, Des MoinesJournalism

Keywords

hydrogeology, geochemistry, isotopes, isotope hydrology, carbon-14, groundwater age, water-rock reaction, pit lake

 

Publications
2018
Hershey, R. L. (2018). Assessment of Tritium Activities in Bailed versus Pumped Samples from Wells at the Nevada National Security Site, Desert Research Institute, 45285
Heintz, K. M., Healey, J. M., Hershey, R. L., Pohlmann, K. F. (2018). Letter Report: Well Evaluation of UE-12t-6: Desert Research Institute
2017
Thomas, J. M., Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H. (2017). Hydraulic fracturing in the upper Humboldt River basin, Nevada, USA. 15th Water-Rock Interaction International Symposium, WRI-15, Procedia Earth and Planetary Science, 17, 189-192, 10.1016/j.proeps.2016.12.065
Pohlmann, K. F., Healey, J. M., Lyles, B. F., Cooper, C. A., Hershey, R. L. (2017). Hydrophysical Evaluation of Wells TW-B, TW-7, UE-6d, U-2gg PSE 3A, U-10L 1, and UE-6e in Yucca Flat (45274, DOE/NV/0000939-40), Desert Research Institute Publication No. 45274
2016
Eissa, M. A., Thomas, J. M., Pohll, G. M., Shouakar-Stash, O., Hershey, R. L., Dawoud, M. (2016). Groundwater recharge and salinization in the arid coastal plain aquifer of the Wadi Watir Delta, Sinai, Egypt, Applied Geochemistry, 71, 48-62, Elsevier, 10.1016/j.apgeochem.2016.05.017
Hershey, R. L., Fereday, W. H., Thomas, J. M. (2016). Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times (45268), Desert Research Institute Publication No. 45268
McGraw, D. S., Hershey, R. L. (2016). Application of Monte Carlo Methods to Perform Uncertainty and Sensitivity Analysis on Inverse Water-Rock Reactions with NETPATH (45267), Desert Research Institute Publication No. 45267
Hershey, R. L., Fereday, W. H. (2016). Laboratory Experiments to Evaluate Matrix Diffusion of Dissolved Organic Carbon Carbon-14 in southern Nevada Fractured-rock Aquifers (45266), Desert Research Institute Publication No. 45266
2015
Chapman, J. B., Cooper, C. A., Lyles, B. F., Hershey, R. L., Healey, J. M. (2015). Handbook: Collecting Groundwater Samples from Monitoring wells in Frenchman Flat, CAU 98, DOE/NV/0000939-23, Desert Research Institute Publication No. 45261
Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R. W., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, D. M., Thomas, J. M., Albright, W. H. (2015). Interim Final Report, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Desert Research Institute Publication No. 41263
2014
Eissa, M. A., Thomas, J. M., Hershey, R. L., Dawoud, M. I., Pohll, G. M., Dahab, K. A., Gomaa, M. A., Shabana, A. R. (2014). Geochemical and isotopic evolution of groundwater in the Wadi Watir Watershed, Sinai Peninsula, Egypt, Environmental Earth Sciences, 71 (4), 1855-1869, Springer-Verlag: New York, 10.1007/s12665-013-2588-4
Hershey, R. L., Rybarski, S. C., Thomas, J. M., Pohll, G. M. (2014). Water-Quality Data, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Report 2, Desert Research Institute Publication No. 41259
2013
Eissa, M. A., Thomas, J. M., Pohll, G. M., Hershey, R. L., Dahab, K., Dawoud, M., Gomaa, M., El Shiekh, A. (2013). Groundwater resource sustainability in the Wadi Watir Delta, Gulf of Aqaba, Hydrogeology Journal, 21 (8), 1833-1851, Springer Berlin Heidelberg: Berlin Heidelberg, 10.1007/s10040-013-1031-y
Cooper, C. A., Hershey, R. L., Healey, J. M., Lyles, B. F. (2013). Estimation of groundwater recharge at Pahute Mesa using the chloride mass-balance method, Desert Research Institute, Desert Research Institute Publication No. 45251
Hershey, R. L., Cablk, M. E., LeFebre, K., Fenstermaker, L.F., Decker, D. L. (2013). Water-Chemistry Evolution and Modeling of Radionuclide Sorption and Cation Exchange during Inundation of Frenchman Flat Playa, Desert Research Institute: Reno, NV, DOE/NA0000939-10; Desert Research Institute Publication No. 45252
Thomas, J. M., Moser, D. P., Fisher, J., Reihle, J. L., Wheatley, A. E., Hershey, R. L., Baldino, C., Weissenfluh, D. (2013). Using water chemistry, isotopes and microbiology to evaluate groundwater sources, flow paths and geochemical reactions in the death valley flow system, USA, Procedia Earth and Planetary Science, 7, 842-845, Accepted.
2012
Jasoni, R. L., Larsen, J. D., Lyles, B. F., Healey, J. M., Cooper, C. A., Hershey, R. L. (2012). Data Report: Meteorological and Evapotranspiration Data from Sagebrush and Pinyon Pine/Juniper Communities at Pahute Mesa, Nevada National Security Site, 2011-2012 (45248), Desert Research Institute Publication No. 45248
2010
Hershey, R. L., Mizell, S. A., Earman, S. B. (2010). Chemical and physical characteristics of springs discharging from reigonal flow systems of the carbonate-rock province of the Great Basin, western United States, Hydrogeology Journal, 18, 1007-1026, 10.1007/s10040-009-0571-7
Michalski, G. S., Earman, S. B., Dahman, C., Hershey, R. L., Mihevc, T. M. (2010). Multiple isotope forensics of nitrate in a wild horse poisoning incident, Forensic Science International, 198, 103-109
2009
Carroll, R. W., Hershey, R. L., Pohll, G. M. (2009). An unconfined groundwater model of the Death Valley Regional flow system and a comparison to its confined predecessor, Journal of Hydrology, 373, 316-328
Stone, M. C., Heyvaert, A. C., Chandler, C., Fritsen, C. H., Hershey, R. L., Moser, D. P., Bruckner, J., Lutz, A. D., Memmott, J. C., Acharya, K. (2009). Ecological model for Walker Lake, Nevada.Ecological model for Walker Lake, Nevada., In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin
Hershey, R. L., Lyles, B. F., Mihevc, T. M., Sharpe, S. E. (2009). Major-ion and trace-element chemistry of Walker River and Walker Lake, Nevada.Major-ion and trace-element chemistry of Walker River and Walker Lake, Nevada., In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin
Heyvaert, A. C., Chandra, S., Fritsen, C. H., Hershey, R. L., Moser, D. P., Stone, M. C., Bruckner, J., Lutz, A. D., Memmot, J., Umek, J., Thomas, J. M. (2009). Contemporary Limnology of Walker Lake, NevadaContemporary Limnology of Walker Lake, Nevada, In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin
2008
Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2008). A comparison of groundwater fluxes computed with MODFLOW and a mixing model using deuterium: application to the eastern Nevada Test Site and vicinity, Journal of Hydrology, 361, 371-385, 10.1016/j.jhydrol.2008.08.005
Earman, S. B., Hershey, R. L., Michalski, G., Dahman, C., Mihevc, T. M. (2008). Evaluation of chemical data from samples collected February 2008 at the Cactus Flat Main Lake depression and surrounding area, Nevada Test and Training Range, Desert Research Institute Publication No. 41244, Revision 1.0.
Hershey, R. L., Paces, J. B., Singleton, M. J., Kwicklis, E. M., Decker, D. L., Fryer, W. M., Earman, S. B. (2008). Geochemical and isotopic evaluation of groundwater movement in Corrective Action Unit 99: Rainier Mesa and Shoshone Mountain, Nevada Test Site, Desert Research Institute Publication No. 45229
Mizell, S. A., Mihevc, T. M., Hershey, R. L. (2008). Field Reconnaissance and Chemistry Data for Selected Water Sources on the Nevada Test and Training Range, Desert Research Institute Publication No. 41247
2007
Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2007). Global optimization of a deuterium calibrated, discrete-state compartment model (DSCM): Application to the eastern Nevada Test Site, Journal of Hydrology, 345, 237-253
Hershey, R. L., Heilweil, P., Gardner, P., Lyles, B. F., Earman, S. B., Thomas, J. M., Lundmar, K. W. (2007). Ground-water chemistry interpretations supporting the Basin and Range regional carbonate-rock aquifer system (BARCAS) study, eastern Nevada and western Utah
Knochenmus, L. A., Laczniak, R. J., Moreo, M. T., Sweetkind, D. S., Wilson, J. W., Thomas, J. M., Justet, L., Hershey, R. L., Earman, S. B., Lyles, B. F., Lundmark, K. (2007). Ground-water conditions, in Welch, A. H., Bright, D. J., and Knochenmus, L. A., eds., Water resources of the Basin and Range carbonate-rock aquifer system, White Pine County, Nevada, and adjacent areas in Nevada and Utah, U. S. Geological Survey Scientific Investigations Report 2007-5261, 37-42
Carroll, R. W., Hershey, R. L., Pohll, G. M. (2007). Groundwater Model of the Death Valley Regional Flow System Using MODFLOW-SURFACT
Laczniak, R. J., Flint, A. L., Moreo, M. T., Knochenmus, L. A., Lundmark, K., Pohll, G. M., Carroll, R. W., Smith, J. L., Welborn, T. L., Heilweil, V. M., Pavelko, M. T., Hershey, R. L., Thomas, J. M., Earman, S. B., Lyles, B. F. (2007). Ground-water budgets, in Welch, A. H., Bright, D. J., and Knochenmus, L. A., eds., Water resources of the Basin and Range carbonate-rock aquifer system, White Pine County, Nevada, and adjacent areas in Nevada and Utah, U. S. Geological Survey Scientific Investigations Report 2007-5261, 43-68
Thomas, J. M., Decker, D. L., Patterson, G. L., Peterman, Z. E., Mihevc, T. M., Larsen, J. D., Hershey, R. L. (2007). Yucca Mountain area saturated zone dissolved organic carbon isotopic data, Yucca Mountain Nevada System of Higher Education Final Report
Hershey, R. L., Justet, L., Heilweil, V., Gardner, P., Lyles, B. F., Earman, S. B., Thomas, J. M., Lundmark, K. (2007). Water Chemistry and Ground-water Flowpath Delineation in the Basin and Range Regional Carbonate Aquifer System (BARCAS), Eastern Nevada and Western Utah, DRI Report No. 41230
2006
Gilliam, A. B., Carroll, R. W., Pohll, G. M., Hershey, R. L. (2006). Numerical simulation of groundwater withdrawal within the Mercury Valley administrative groundwater basin, Nevada
Carroll, R. W., Hershey, R. L., Pohll, G. M. (2006). Numerical simulation of groundwater withdrawal from proposed pumping near the southeastern Nevada Test Site
2005
Hershey, R. L., Thomas, J. M., Rose, T. P., Paces, J. B., Farnham, I. M., Benedict, J. ,. (2005). Evaluation of groundwater movement in the Frenchman Flat CAU using geochemical and isotopic analysis
2004
Earman, S. B., Hershey, R. L. (2004). Water quality impacts from waste rock at a Carlin-type gold mine, Elko County, Nevada, Environmental Geology, 45, 8, 1043-1053
1995
Hershey, R. L., Mizell, S. A. (1995). Water Chemistry of Spring Discharge from the Carbonate-Rock Province of Nevada, and Death Valley, California. Project Report to the Las Vegas Valley Water District, 45, DRI Report No. 41140
Conference Proceedings
2019
Hershey, R. L., Parashar, R., Pham, H. V., Lyles, B. F., Cooper, C. A., Heintz, K. M. (2019). Evaluation of Timber Mountain Recharge and Groundwater Flow in Relation to Pahute Mesa Groundwater Flow, Department of Energy, Underground Test Area Activity, Technical Information Exchange, August 29, 2019, Presented.
Thomas, J. M., Hershey, R. L., Farnham, I. (2019). Using Dissolved Organic Carbon 14C to Calculate Groundwater Travel Times in Southern Nevada, Devils Hole Workshop 2019: Death Valley, California, May 1, 2019-May 3, 2019, Presented.
Farnham, I. M., Hershey, R. L., Visser, A., Kwicklis, E. (2019). Phase II Geochemical and Isotopic Evaluation of Groundwater Flow in the Pahute Mesa-Oasis Valley Flow System, Department of Energy, Underground Test Area Activity, Technical Information Exchange: Las Vegas, August 29, 2019, Presented.
2017
Kruger, B. R., Moser, D. P., Hershey, R. L. (2017). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon.: Beatty, NV
Kruger, B. R., Moser, D. P., Hershey, R. L. (2017). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon, Devils Hole Workshop: Beatty, NV, May 2017.
2016
Thomas, J. M., Hershey, R. L., Fereday, W. H. (2016). Using Dissolved Organic Carbon Isotopes for Groundwater Age Dating in Southern Nevada, USA, European Geosciences Union Annual Meeting: Vienna, Austria, April 17, 2016-April 22, 2016, EGU2016-5176
Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, M., Thomas, J. M. (2016). Assessment of the Migration Potential of Hydraulic Fracturing Fluids in Northeastern Nevada, American Water Resources Association: Anchorage, AK, April 25, 2016-April 27, 2016
Moser, D. P., Willever, K. L., Fisher, J. C., Sackett, J. D., Kruger, B. R., Bruckner, J., Hershey, R. L., Fritsen, C. H., Memmott, J. C., Bloomquist, D. (2016). Linkages between limnology, biogeochemistry, and microbial communities of a threatened terminal lake ecosystem: Walker Lake, Nevada, USA, Terminus Lakes Workshop. University of Nevada Reno: Reno, NV, August 2016.
Kruger, B. R., Werne, J. P., Branstator, D. K., Hrabik, T. R., Chikaraishi, Y., Ohkouchi, N., Hershey, R. L., Moser, D. P., Minor, E. C. (2016). Applying natural abundance radiocarbon analysis to understand ecosystem dynamics in surface and groundwater: Insights and precautions, American Society for Limnology and Oceanography (ASLO) Annual Meeting: Salt Lake City, UT, April 2016, Presented.
2015
Kruger, B. R., Moser, D. P., Hershey, R. L. (2015). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon, Devils Hole Workshop: Ash Meadows National Wildlife Refuge, NV, May 7, 2015
2013
Thomas, J. M., Moser, D. P., Fisher, J., Reihle, J. L., Wheatley, A. E., Hershey, R. L., Baldino, C., Weissenfluh, D. (2013). Using Water Chemistry, Isotopes and Microbiology to Evaluate Groundwater Sources, Flow Paths and Geochemical Reactions in the Death Valley Flow System, USA, WRI Conference: Grenoble, France, Invited talk, Presented.
2012
Eissa, M. A., Thomas, J. M., Pohll, G. M., Houakar-Stash, O., Hershey, R. L., Dawoud, M. I., Dahab, K., Gomaa, M. A. (2012). Modeling groundwater recharge and seawater intrusion in the Quaternary coastal plain aquifer of the Wadi Watir Delta, Sinai, Egypt, The 22nd Annual Goldschmidt Conference: Montreal, June 24, 2012-June 29, 2012, Abstract 220cd, 590
2011
LeFebre, K., Hershey, R. L., Decker, D. L. (2011). Evaluation of Radionuclide Mobilization and Redistribution during Playa Lake Formation on the Frenchman Flat Playa, Nevada Nuclear Security Site, 2011 Fall Meeting American Geophysical Union: San Francisco, CA, December 5, 2011-December 9, 2011, Abstract H41H-1162
2010
Eissa, M. A., Thomas, J. M., Dawoud, M. I., Pohll, G. M., Gomaa, M. A., Dahab, K. A., Hershey, R. L. (2010). Groundwater resource sustainability in Wadi Watir, Gulf of Aqaba, Sinai, Egypt, 10th International Conference on Development of Drylands, Cairo, Egypt, December 12-15, 2010
2009
Fisher, J., Bruckner, J., PlanerFriedrich, B., Hershey, R. L., Moser, D. P. (2009). Arsenic biogeochemistry of Walker Lake NV, Terminus Lakes Workshop: Reno, NV
Bruckner, J., Fisher, J., Fritsen, C. H., Memmott, J. C., Hershey, R. L., Heyvaert, A. C., Moser, D. P. (2009). Microbial communities of Walker Lake, NV: Bacterial diversity of an alkaline, moderately saline terminal lake, American Society for Microbiology: Philadelphia, PA
Kwicklis, E. M., Rose, T. P., Farnham, I. M., Hershey, R. L., Paces, J. B. (2009). Evaluation of groundwater mixing, flow paths and travel times at the Nevada Test Site using geochemical and isotopic tracers, Geological Society of America
Fisher, J., Bruckner, J., Planer-Friedrich, B., Hershey, R. L., Moser, D. P. (2009). Arsenic biogeochemistry of Walker Lake, NV, Terminus Lakes Workshop: Reno, NV
2008
Michalski, G., Dahman, C., Earman, S. B., Hershey, R. L. (2008). Mutiple isotope forensics on nitrate in the poisoning of wild horses in 2007, American Geophysical Union Fall Meeting
Bruckner, J., Fritsen, C. H., Memmott, J. C., Hershey, R. L., Heyvaert, A. C., Moser, D. P. (2008). Microbial communities of a saline, alkaline terminal lake (Walker Lake, NV), American Society for Microbiology Annual Meeting: Boston, MA, June 2008, Poster No. N-116.
2007
Hershey, R. L., Decker, D. L., Earman, S. B., Ryu, J., Reimus, P. W., Garcia, E. S. (2007). Laboratory experiments of carbon-14 uptake on calcite and dolomite, The 233rd American Chemical Society National Meeting: Chicago
Decker, D. L., Earman, S. B., Hershey, R. L., Ryu, J., Garcia, E. S., Reimus, P. W. (2007). Reactive transport of 14C through a carbonate aquifer: Implications for contaminant migration, Geological Society of America Annual Meeting: Denver
Garcia, E. S., Reimus, P. W., Hershey, R. L., Decker, D. L., Earman, S. B. (2007). Laboratory experiments of carbon-14 uptake and release from calcite, The 233rd American Chemical Society National Meeting: Chicago
Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2007). A comparison of groundwater fluxes computed with MODFLOW and a stable isotope mixing model: Application to the eastern Nevada Test Site and vicinity, H41E-0829, American Geophysical Union Fall Meeting: San Francisco
2005
Hershey, R. L., Decker, D. L. (2005). Coupling a discrete-state compartment model and a water-rock reaction model with application to a large-scale hydrologic system in southern Nevada: San Francisco, CA
Hershey, R. L., Earman, S. B. (2005). Estimating groundwater recharge via a deuterium-calibrated discrete-state compartment model, H31C-1320, American Geophysical Union Fall Meeting: San Francisco
2003
Hershey, R. L., Papelis, C., Decker, D. L., Miller, G. C. (2003). Laboratory experiments of As(V) and As(III) sorption onto pit-lake sediments from three different orebody types: Cairns, Queensland, Australia