Troy Gilmore

Troy Gilmore

  • Contact Information
  • My Story
  • Publications
  • Background
  • Interests
  • Grants
  • Advising
  • Courses Taught

Contact Information

TitleGroundwater Hydrologist
Faculty RankAssociate Professor
Address603 South Hardin Hall
3310 Holdrege Street
Lincoln NE

East Campus
  • office: 402-470-1741
  • fax: 402-472-4915
VitaeDownload file


Contact Preference


Office Hours

stop by any time (603 Hardin Hall)

My Story

Additional Grants & Funding

  • Vadose Zone Nitrate Accumulation Lower Loup Natural Resources District Area 30, Relation to Manure Application, Fertilizer Management and Groundwater Nitrate Concentrations ; Funding Agency Lower Loup NRD; Period: 8/2/2022 - 7/31/2024; (Funded: $67,506)
  • Delivery of Watershed Science Education to Decision Makers A Multi-Agency Collaboration; Funding Agency NET; Period: 4/1/2029 - 6/30/2023; (Funded: $225,204)
  • LTAR Research: Extending USDA-requested Passive Sampling for Stream Water Age in Bazile Creek Watershed; Funding Agency: USDA via UNL's USDA Ag Intensification Western Corn Belt ; Period: 11/21/22 - 3/31/2024; (Funded: $10,000)
  • Using a Coupled Surface Water/Groundwater Model Informed by Groundwater Age, Geophysics, and Vadose Zone Coring to Identify Type and Placement of Management Practices to Reduce Legacy Groundwater Nitrate Concentrations; Funding Agency: USGS; Period: 1/1/2023 - 12/30/2025; (funded: $249,977)
  • Cultivate ACCESS to Data Science in Agriculture; Funding Agency:USDA; Period: 9/1/2023 - 8/31/2027; (funded: $749,825)
  • Pilot and Assessment of Cyberinfrastructure for Image-based Environmental Monitoring and Education; Funding Agency: NRI/Collaboration Initiative (Internal); Period: 7/1/2023 - 6/30/2025; (funded:$150,000)
  • Nitrate transport in playa wetlands and their substratum soils of the Rainwater Basin; Funding Agency: NRI/Collaboration Initiative (Internal); Period: 7/1/2023 - 6/30/2025; (funded:$64,385)

Feature Stories

Selected Publications

Gilmore, Troy, Korus, Jesse, 2024. Groundwater In Nebraska (ESN-1): 2 pp., size 8.5" x 11".Online
Young, A., Gilmore, E. T, Shrestha, N. 2024. Surficial geology of the Hire SW 7.5’ Quadrangle, Nebraska.
Jensen, C. R., Genereux, D. P., Gilmore, T. E., & Solomon, D. K. (2023). Modified Tracer Gas Injection for Measuring Stream Gas Exchange Velocity in the Presence of Significant Temperature Variation. Water Resources Research, 59(6), e2023WR034495.
Kishawi, Y., Mittelstet, A. R., Gilmore, T. E., Twidwell, D., Roy, T., & Shrestha, N. (2023). Impact of Eastern Redcedar encroachment on water resources in the Nebraska Sandhills. Science of The Total Environment, 858, 159696.
Zlotnik, V. A., Solomon, D. K., Genereux, D. P., Gilmore, T. E., Humphrey, C. E., Mittelstet, A. R., & Zlotnik, A. V. (2023). Theory of an Automatic Seepage Meter and Ramifications for Applications. Water Resources Research, 59(10), e2023WR034766.
Birgand, Francois, Chapman, K., Hazra, A., Gilmore, T., Etheridge, R., Staicu, A.-M. (2022). Field performance of the GaugeCam image-based water level measurement system. PLoS Water, 1(7), e0000032.Online
Chapman, K. W., Gilmore, T., Chapman, C. D., Birgand, Francois, Mittelstet, A., Harner, M., Mehrubeoglu, M., Stranzl, Jr, J. E. (2022). Open-Source Software for Water-Level Measurement in Images With a Calibration Target. Water Resources Research, 58(8), e2022WR033203.Online
Cherry, M. L., Gilmore, T., Messer, T., Li, Y., Westrop, J. (2022). A Pivotal New Approach to Groundwater Quality Assessment. ACS ES\&T Water.Online
CUAHSI Board of Directors \& Officers (2022). COVID-19 Impacts Highlight the Need for Holistic Evaluation of Research in the Hydrologic Sciences. Water Resources Research, 58(2), e2021WR030930Online
Humphrey, C. E., Solomon, D. K., Genereux, D. P., Gilmore, T., Mittelstet, A., Zlotnik, V., Zeyrek, C., Jensen, C. R., MacNamara, M. R. (2022). Using Automated Seepage Meters to Quantify the Spatial Variability and Net Flux of Groundwater to a Stream. Water Resources Research, 58(6), e2021WR030711Online
Jensen, C. R., Genereux, D. P., Gilmore, T., Solomon, D. K., Mittelstet, A., Humphrey, C. E., MacNamara, M. R., Zeyrek, C., Zlotnik, V. (2022). Estimating groundwater mean transit time from SF6 in stream water: field example and planning metrics for a reach mass-balance approach. Hydrogeology Journal, 30(2), 479--494.
Pekarek, K., McCullough, M., Gilmore, T. (2022). Module: Nebraska’s Nitrate Challenge. University of Nebraska Extension.
Pekarek, K., McCullough, M., Gilmore, T. (2022). Module: Nitrate and Human Health. University of Nebraska Extension.
Pekarek, K., McCullough, M., Gilmore, T. (2022). Nitrate in Nebraska: The Basics. University of Nebraska Extension.
Quaggio, C. S., Gastmans, D., de Souza Martins, Veridiana Teixeira, Gilmore, T. (2022). Combined use of statistical Bayesian model and strontium isotopes deciphering the high complexity groundwater flow in the Guarani Aquifer System (GAS). Applied Geochemistry, 146, 105473.
Zeyrek, C., Mittelstet, A., Gilmore, T., Zlotnik, V., Solomon, D. K., Genereux, D. P., Humphrey, E., Shrestha, N. (2022). Modeling groundwater transit time distributions and means across a Nebraska watershed: effects of heterogeneity in the aquifer, riverbed, and recharge parameters. Journal of Hydrology, 128891.
Eger, G.Z., Silva, J. G., Marques, E.A.G, Leão, B.R.C., da Rocha, D.G.T.B., Gilmore, T. (2021). Recharge assessment in the context of expanding agricultural activity: Urucuia Aquifer System, western State of Bahia, Brazil. Journal of South American Earth Sciences. Volume 112, Part 1, 103601.Online
Gilmore, T., Cherry, M., Gastmans, D., Solomon, D.K., Humphrey, E.C. (2021). The 3H/3He Groundwater Age-Dating Method And Applications. Derbyana. Vol. 42. DOI:
Petre, M.A., Genereux, D.P., Koropeckyi-Cox, L., Knappe, D.R.U., Duboscq, S., Gilmore, T.E., Hopkins, Z.R. 2021. Per- and Polyfluoroalkyl Substance (PFAS) Transport from Groundwater to Streams Near a PFAS Manufacturing Facility in North Caroline, USA. Environmental Science & Technology. 55:5848-5856.Online
Richards, G., Gilmore, T., Mittelstet, A.R., Messer, T.L., Snow, D.D. (2021). Baseflow nitrate dynamics within nested watersheds of an agricultural stream in Nebraska, USA. Agriculture, Ecosystems and Environment 308 (2021) 107223. doi:10.1016/j.agee.2020.107223Online
Santarosa, L.V., Gastmans, D., Gilmore, T.E., Boll, J., Betancur, S.B., Gonçalves, V.F.M. (2021). Baseflow and water resilience variability in two water management units in southeastern Brazil. International Journal of River Basin Management.
Shrestha, N., Mittelstet, A.R., Gilmore, T.E., Zlotnik, V., Neale, C. (2021). Effects of drought on groundwater-fed lake areas in the Nebraska Sand Hills. Journal of Hydrology: Regional Studies. 36, 100877.
Shrestha, N., Mittelstet, A.R., Young, A., Gilmore, T.E., Gosselin, D., Zeyrek, C. (2021). Groundwater level assessment and prediction in the Nebraska Sand Hills using LIDAR-derived lake water level. Journal of Hydrology. Vol. 600, 126582.Online
Wells, M., Gilmore, T.E., Nelson, N., Mittelstet, A.R., Bohlke, J.K. (2021). Determination of vadose zone and saturated zone nitrate lag times using long-term groundwater monitoring data and statistical machine learning. Hydrol. Earth Syst. Sci., 25, 811–829, 2021 Online
Abimbola, O. P., Mittelstet, A., Gilmore, T., Korus, J. (2020). Influence of watershed characteristics on streambed hydraulic conductivity across multiple stream orders. Scientific Reports, 10(1), 3696.
Abimbola, O., Mittelstet, A., Gilmore, T. (2020). Geostatistical features of streambed vertical hydraulic conductivities in Frenchman Creek Watershed in Western Nebraska. HYDROLOGICAL PROCESSES, 34(16), 3481-3491.Online
Cherry, M., Gilmore, T., Mittelstet, A., Gastmans, D., Santos, V., Gates, J. (2020). Recharge seasonality based on stable isotopes: Nongrowing season bias altered by irrigation in Nebraska. HYDROLOGICAL PROCESSES, 34(7), 1575-1586. Online
Korus, J., Fraundorfer, W. P., Gilmore, T., Karnik, K. (2020). Transient streambed hydraulic conductivity in channel and bar environments, Loup River, Nebraska. HYDROLOGICAL PROCESSES, 34(14), 3061-3077. Online
Solomon, D. K., Humphrey, E., Gilmore, T., Genereux, D. P., Zlotnik, V. (2020). An Automated Seepage Meter for Streams and Lakes. WATER RESOURCES RESEARCH, 56(4).Online
Cherry, M., Gilmore, T.E., Mittelstet, A.R., Gastmans, D., Gates, J. 2019. Isotopic Composition of Groundwater and Precipitation in Nebraska, USA. XX Congresso Brasileiro de Aguas Subterraneas. pg. 1-4.Online
Gilmore, T., Johnson, M., Korus, J., Mittelstet, A., Briggs, M. A., Zlotnik, V., Corcoran, S. 2019. Streambed Flux Measurement Informed by Distributed Temperature Sensing Leads to a Significantly Different Characterization of Groundwater Discharge. Water.Online
Gilmore, T., Korus, J., Pennisi, L., Martin, D. L., Pekarek, K. 2019. Needs Assessment: Watershed Science for Water Resources Directors. Journal of Extension. 57(4).Online
Gilmore, T., Zlotnik, V., Johnson, M. 2019. Recognition of Regional Water Table Patterns for Estimating Recharge Rates in Shallow Aquifers. Groundwater. 57(3):443--454.Online
Kirchheim, R. E., Gastmans, D., Chang, H. K., Gilmore, T. 2019. The use of isotopes in evolving groundwater circulation models of regional continental aquifers: The case of the Guarani Aquifer System. Hydrological Processes, 33(17):2266-2278.Online
Mittelstet, A., Gilmore, T., Messer, T., Rudnick, D., Heatherly, T. 2019. Evaluation of selected watershed characteristics to identify best management practices to reduce Nebraskan nitrate loads from Nebraska to the Mississippi/Atchafalaya River basin. AgOnline
Mittelstet, A., Gilmore, T., Messer, T., Rudnick, D., Heatherly, T. 2019. Evaluation of Selected Watershed Characteristics to Identify Best Management Practices to Reduce Nebraskan Nitrate Loads from Nebraska to the Mississippi/Atchafalaya River Basin. AgOnline
Pennisi, L., Gilmore, T., Gilmore, T. E., Korus, J., Pennisi, L., Martin, D., Pekarek, K. 2019. Needs Assessment: Watershed Science for Water-Resources Directors. Journal of Extension. 57(4).Online
Gilmore, T., Zlotnik, V., Johnson, M. (2018). Recognition of regional water table patterns for estimating groundwater recharge rates. Groundwater.
Wells, M. J., Gilmore, T., Mittelstet, A., Snow, D., Sibray, S. (2018). Assessing Decadal Trends of a Nitrate-Contaminated Shallow Aquifer in Western Nebraska Using Groundwater Isotopes, Age-Dating, and Monitoring. WATER, 10(8).
Korus, J.T., Gilmore, T.E., Waszgis, M.M., Mittelstet, A.R. 2017. Unit-bar migration and bar-trough deposition: impacts on hydraulic conductivity and grain size heterogeneity in a sandy streambed. Hydrogeology Journal, V26 (2), 553-564 p.Online
Gilmore, T. E., Genereux, D. P., Solomon, D. K., Solder, J. E., Kimball, B. A., Mitasova, H., Birgand., F. 2016. Quantifying the fate of agricultural nitrogen in an unconfined aquifer: stream-based observations at three different scales. Water Resources ROnline
Gilmore, T., Genereux, D. P., Solomon, D. K., Farrell, K. M., Mitasova, H. 2016. Aquifer nitrate legacy and dynamics observed through groundwater sampling in streambeds and well nests. Water Resources Research.
Gilmore, T., Genereux, D. P., Solomon, D. K., Solder, J. E. 2016. Groundwater transit time distribution and mean from streambed sampling in an agricultural coastal plain watershed, North Carolina, USA. Water Resources Research. 52: 2025–2044.Online
Gilmore, T.E., D.P. Genereux, D.K. Solomon, K.M. Farrell, H. Mitasova. 2016. Aquifer nitrate budget and future fluxes estimated through groundwater sampling in streambeds and well nests. Water Resources Research. 52: 9046-9065.Online
Heilweil, V. M., Solomon D.K., Darrah, T. H., Gilmore T.E., and Genereux, D.P. 2016. Gas-Tracer Experiment for Evaluating the Fate of Methane in a Coastal Plain Stream: Degassing versus in-Stream Oxidation, Environ. Sci. Technol., 50(19), 10504-10511,
Heilweil, V. M., Solomon, D. K., Darrah, T. H., Gilmore, T., Genereux, D. P. 2016. A gas-tracer injection for evaluating the fate of stream methane: Atmospheric loss versus oxidation. Environmental Science and Technology.50: 10504-10511.Online
Solder, J.E., T.E Gilmore, D. Genereux, D.K. Solomon. 2015. Development and testing of a tube seepage meter for in-situ measurement of specific discharge and hydraulic conductivity in streambeds. Groundwater. gwat.12388.
Solomon, D.K., T.E. Gilmore, J.E Solder, B.A. Kimball, D.P. Genereux. 2015. Evaluating an unconfined aquifer by analysis of age-dating tracers in stream water. Water Resources Research, 51, 8883-8899Online
Gilmore, T.E., F. Birgand and K. Chapman. 2013. Source and magnitude of error in an inexpensive image-based water level measurement system. Journal of Hydrology 496: 178-186.Online



DegreeMajorInstitutionYear Awarded
Doctorate of PhilosophyBiological and Agricultural EngineeringNorth Carolina State University2015
Bachelor of ScienceCivil EngineeringNorth Carolina State University2010





TitleAwarded byYear Awarded
National Winner - Communication: Educational Video RecordingNational Association of County Agricultural Agents2022
Provost's Graduate FellowshipNorth Carolina State University2011
Fundamentals of Engineering ExamNorth Carolina Board of Examiners for Engineers and Surveyors2010
Civil Engineering Dept Citizenship AwardNorth Carolina State University2010
College of Engineering Dean's Graduate FellowshipNorth Carolina State University2010


Professional Organizations

American Geophysical UnionMember (2012-current)
American Society of Biological and Agricultural EngineersMember (2010-current)




SNR Program Areas

  • Environmental Science

Areas of Interest/Expertise

  • Isotope/Tracer Hydrology
  • Agricultural nutrient and water fluxes
  • Groundwater-surface water interactions
  • Groundwater and surface water quantity and quality
  • Methods for monitoring groundwater and surface water
  • Isotopes
  • Water Quality


Currently this page only displays grants that were awarded on 1/1/ 2009 to the present. If a grant was awarded prior to 1/1/ 2009 and is still active, it will not be displayed on this page.

Grant TitleAdvancing Image-Based Hydrology for USGS Stream Gage Applications
Starting Date03/08/2023


Ending Date02/20/2025
Funding Level$271,000.00
Funding AgencyU.S. Geological Survey


Grant TitleExtending USDA-requested Passive Sampling for Stream Water Age in Bazile Creek Watershed
Starting Date11/21/2022


Ending Date03/31/2024
Funding Level$14,000.00
Funding AgencyARD Strategic Funding (Internal)


Grant TitleIncreasing the applicability of image-based water level measurement techniques
Starting Date01/01/2022


Ending Date12/20/2022
Funding Level$10,000.00
Funding AgencyJohn and Nettie David Memorial Trust Fund


Grant TitleImage-Based Streamflow and Water Quality Modeling
Starting Date10/01/2021


Ending Date09/30/2022
Funding Level$20,000.00
Funding AgencyU.S. Geological Survey via Nebraska Water Center


Grant TitleModeling to Reduce Highway Flooding
Starting Date07/01/2021


Ending Date05/31/2023
Funding Level$143,166.00
Funding AgencyNebraska Department of Transportation


Grant TitleDelivery of Watershed Science Education to Decision Makers A Multi-Agency Collaboration
Starting Date04/08/2021


Ending Date06/30/2022
Funding Level$78,601.00
Funding AgencyNebraska Environmental Trust


Grant TitleSurvey of Groundwater Transit Times and Nitrate Delivery to Bazile Creek (Additional Funding)
Starting Date04/08/2020


Ending Date05/31/2021
Funding Level$15,000.00
Funding AgencyNebraska Department of Environment and Energy


Grant TitleLTAR Research: Testing a Novel Groundwater Age- dating Technique in the Bazile Creek watershed
Starting Date11/01/2019


Ending Date10/31/2022
Funding Level$33,648.00
Funding AgencyUSDA-LTAR via UNL-ARD


Grant TitleGroundwater Transit Time (Additional Funding)
Starting Date07/23/2019


Ending Date05/31/2021
Funding Level$97,532.00
Funding AgencyNational Science Foundation


Grant TitleDWFI Graduate Fellowship: Influence of recharge patterns on the sustenance of groundwater-fed streams
Starting Date07/01/2019


Ending Date06/30/2022
Funding Level$52,500.00
Funding AgencyDaugherty Water for Food Institute


Grant TitleWatershed Science Education Collaboration
Starting Date05/24/2019


Ending Date06/30/2022
Funding Level$225,204.00
Funding AgencyNebraska Environmental Trust


Grant TitlePFAST - Groundwater Age - North Carolina
Starting Date05/07/2019


Ending Date12/31/2019
Funding Level$16,765.00
Funding AgencyNorth Carolina State University


Grant TitleBazile Creek Nitrate Isotopes
Starting Date04/30/2019


Ending Date08/31/2019
Funding Level$2,081.00
Funding AgencyUpper Elkhorn NRD


Grant TitleUNO-NASA Space Grant: NASA Nebraska Space Grant Fellowship 2018-2019 Flynn
Starting Date08/01/2018


Ending Date02/28/2019
Funding Level$4,000.00
Funding AgencyNational Aeronautics and Space Administration - NE


Grant TitleSurvey of Groundwater Transit Times and Nitrate Delivery to Bazile Creek
Starting Date07/13/2018


Ending Date05/31/2020
Funding Level$15,000.00
Funding AgencyNebraska Department of Economic Quality


Grant TitleHydrologic Monitoring and Assessment of Upper Little Blue River Basin
Starting Date07/01/2018


Ending Date06/30/2021
Funding Level$145,924.00
Funding AgencyTri-Basin NRD


Grant TitleApplication of isotopic tracers to determine water residence times in multi-scale water management
Starting Date08/01/2017


Ending Date07/31/2019
Funding Level$19,983.00
Funding Agency2017 IANR SPRINT


Grant TitleMiddle Republican Hydrogeologic Framework and Groundwater Observation Network (Additional Funding)
Starting Date06/19/2017


Ending Date05/31/2020
Funding Level$70,500.00
Funding AgencyMiddle Republican NRD


Grant TitlePilot Watershed Curriculum
Starting Date12/10/2016


Ending Date12/10/2017
Funding Level$3,000.00
Funding Agency



Graduate Programs

Master of Applied Science

Master of Science in Natural Resource Sciences
including specializations in

  • Hydrological Sciences

Doctorate of Philosophy in Natural Resource Sciences
including specializations in

  • Hydrological Sciences

Courses Taught

Course NumberCourse TitleFall Even YearsFall Odd YearsSpring Even YearsSpring Odd YearsSummer SessionCross Listing
NRES 898Special Topics: Subsurface environmental tracer applications in agricultureXX