Skip to Main Content U.S. Department of Energy
Energy and Environment Directorate

Tim Johnson

Tim Johnson

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 372-4715

PNNL Patents

PNNL Publications

2018

  • Dobson P.F., T.J. Kneafsey, J. Morris, A. Singh, M.D. Zoback, B. Roggenthen, and T.W. Doe, et al. 2018. "The EGS Collab Hydroshear Experiment at the Sanford Underground Research Facility - Siting Criteria and Evaluation of Candidate Sites." Transactions - Geothermal Resources Council 42. PNNL-SA-137953.
  • Johnson T.C., and J.N. Thomle. 2018. "3-D Decoupled Inversion of Complex Conductivity Data in the Real Number Domain." Geophysical Journal International 212, no. 1:284-296. PNNL-SA-123575. doi:10.1093/gji/ggx416
  • Kneafsey T.J., D.A. Blankenship, P.F. Dobson, H. Knox, T.C. Johnson, J. Ajo-Franklin, and P.C. Schwering, et al. 2018. "EGS Collab Project Experiment 1 Overview and Progress." Transactions - Geothermal Resources Council 42. PNNL-SA-137951.
  • Strickland C.E., M.J. Truex, R.D. Mackley, and T.C. Johnson. 2018. Deep Vadose Zone Monitoring Strategy for the Hanford Central Plateau. PNNL-28031. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone Monitoring Strategy for the Hanford Central Plateau
  • Truex M.J., G.B. Chronister, C.E. Strickland, C.D. Johnson, G.D. Tartakovsky, M. Oostrom, and R.E. Clayton, et al. 2018. Deep Vadose Zone Treatability Test of Soil Desiccation for the Hanford Central Plateau: Final Report. PNNL-26902. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone Treatability Test of Soil Desiccation for the Hanford Central Plateau: Final Report

2017

  • Johnson T.C., G. Hammond, and X. Chen. 2017. "PFLOTRAN-E4D: A parallel open source PFLOTRAN module for simulating time-lapse electrical resistivity data." Computers & Geosciences 99. PNNL-SA-113670. doi:10.1016/j.cageo.2016.09.006

2015

  • Johnson T.C., and D.M. Wellman. 2015. "Accurate modeling and inversion of electrical resistivity data in the presence of metallic infrastructure with known location and dimension." Geophysical Journal International 202, no. 2:1096-1108. PNNL-SA-104673. doi:10.1093/gji/ggv206
  • Johnson T.C., D.F. Rucker, and D.R. Glaser. 2015. "Near-Surface Geophysics at the Hanford Nuclear Site, the United States." In Treatise on Geophysics, Second Edition, edited by G Schubert. 571-595. Amsterdam:Elsevier. PNNL-SA-100920.
  • Johnson T.C., R. Versteeg, F.D. Day-Lewis, W. Major, and J.W. Lane. 2015. "Time-Lapse Electrical Geophysical Monitoring of Amendment-Based Biostimulation." Ground Water 53, no. 6:920-932. PNNL-SA-115558. doi:10.1111/gwat.12291
  • Johnson T.C., R. Versteeg, J.N. Thomle, G.E. Hammond, X. Chen, and J.M. Zachara. 2015. "Four-dimensional electrical conductivity monitoring of stage-driven river water intrusion: Accounting for water table effects using a transient mesh boundary and conditional inversion constraints." Water Resources Research 51, no. 8:6177-6196. PNNL-SA-103949. doi:10.1002/2014WR016129
  • Robinson J., T.C. Johnson, and L.D. Slater. 2015. "Challenges and opportunities for fractured rock imaging using 3D cross-borehole electrical resistivity." Geophysics 80, no. 2:e49-e61. PNNL-SA-111273. doi:10.1190/GEO2014-0138.1
  • Singha K., F.D. Day-Lewis, T.C. Johnson, and L.D. Slater. 2015. "Advances in interpretation of subsurface processes with time-lapse electrical imaging." Hydrological Processes 29, no. 6:15-49-1576. PNNL-SA-110809. doi:10.1002/hyp.10280
  • Strickland C.E., T.C. Johnson, and R.I. Odom. 2015. "Three-Dimensional Fréchet Sensitivity Kernels for Electromagnetic Wave Propagation." Geophysical Journal International 203, no. 1:482-505. PNNL-SA-106439. doi:10.1093/gji/ggv272
  • Truex M.J., C.E. Strickland, M. Oostrom, C.D. Johnson, G.D. Tartakovsky, T.C. Johnson, and R.E. Clayton, et al. 2015. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring Results, Fiscal Year 2015. PNNL-24706. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring Results, Fiscal Year 2015

2014

2013

  • Johnson T.C., and D.M. Wellman. 2013. Re-Inversion of Surface Electrical Resistivity Tomography Data from the Hanford Site B-Complex. PNNL-22520; RPT-DVZ-AFRI-014. Richland, WA: Pacific Northwest National Laboratory. Re-Inversion of Surface Electrical Resistivity Tomography Data from the Hanford Site B-Complex
  • Johnson T.C., M. Oostrom, M.J. Truex, J.N. Thomle, and T.W. Wietsma. 2013. "Determination of water saturation using gas phase partitioning tracers and time-lapse electrical conductivity measurements." Vadose Zone Journal 12, no. 2. PNNL-SA-91015. doi:10.2136/vzj2012.0142
  • Truex M.J., M. Oostrom, C.E. Strickland, T.C. Johnson, C.D. Johnson, R.E. Clayton, and G.B. Chronister. 2013. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring Results. PNNL-22826. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring Results
  • Truex M.J., T.C. Johnson, C.E. Strickland, J.E. Peterson, and S.S. Hubbard. 2013. "Monitoring Vadose Zone Desiccation with Geophysical Methods." Vadose Zone Journal 12, no. 2. PNNL-SA-90886. doi:10.2136/vzj2012.0147
  • Wallin E.L., T.C. Johnson, W.J. Greenwood, and J.M. Zachara. 2013. "Imaging high stage river-water intrusion into a contaminated aquifer along a major river corridor using 2D time-lapse surface electrical resistivity tomography." Water Resources Research 49, no. 3:1693-1708. PNNL-SA-88529. doi:10.1002/wrcr.20119
  • Wellman D.M., M.J. Truex, T.C. Johnson, A.L. Bunn, and E.C. Golovich. 2013. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2012 Annual Report. PNNL-22322. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2012 Annual Report

2012

  • Johnson T.C., L. Slater, D. Ntarlagiannis, F.D. Day-Lewis, and M. Elwaseif. 2012. "Monitoring groundwater-surface water interaction using time-series and time-frequency analysis of transient three-dimensional electrical resistivity changes." Water Resources Research 48. PNNL-SA-85275. doi:10.1029/2012WR011893
  • Johnson T.C., R.J. Versteeg, M.L. Rockhold, L.D. Slater, D. Ntarlagiannis, W.J. Greenwood, and J.M. Zachara. 2012. "Characterization of a contaminated wellfield using 3D electrical resistivity tomography implemented with geostatistical, discontinuous boundary, and known conductivity constraints." Geophysics 77, no. 6:EN85-EN96. PNNL-SA-86781. doi:10.1190/geo2012-0121.1
  • Johnson T.C., W.J. Greenwood, C.E. Strickland, M.J. Truex, V.L. Freedman, G.B. Chronister, and D.F. Rucker. 2012. "3D Characterization and Time-Lapse Imaging of the Desiccation Treatability Test at the Hanford BC-Cribs and Trenches Site using High Performance Electrical Resistivity Imaging." In Annual Waste Management Symposium (WM2012): Improving the Future in Waste Management, February 26 - March 1, 2012, Pheonix AZ, 2181-2189. Tucson, Arizona:Waste Management Symposia, Inc. PNNL-SA-84065.
  • Meyer J., E.W. Bethel, J.L. Horsman, S.S. Hubbard, H. Krishnan, A. Romosan, and E. Keating, et al. 2012. "Visual Data Analysis as an Integral Part of Environmental Management." IEEE Transactions on Visualization and Computer Graphics 18, no. 12:2088 - 2094. PNNL-SA-80187. doi:10.1109/TVCG.2012.278
  • Revil A., M. Karaoulis, T.C. Johnson, and A. Kemna. 2012. "Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology." Hydrogeology Journal 20, no. 4:617-658. PNNL-SA-89466. doi:10.1007/s10040-011-0819-x
  • Szecsody J.E., M.J. Truex, L. Zhong, T.C. Johnson, N. Qafoku, M.D. Williams, and W.J. Greenwood, et al. 2012. "Geochemical and Geophysical Changes during Ammonia Gas Treatment of Vadose Zone Sediments for Uranium Remediation." Vadose Zone Journal 11, no. 4. PNNL-SA-86840. doi:10.2136/vzj2011.0158
  • Truex M.J., M. Oostrom, C.E. Strickland, T.C. Johnson, V.L. Freedman, C.D. Johnson, and W.J. Greenwood, et al. 2012. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Soil Desiccation Pilot Test Results. PNNL-21369. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Soil Desiccation Pilot Test Results
  • Wellman D.M., M.D. Freshley, T.C. Johnson, and A.L. Miracle. 2012. "Contaminants in Vadose Zone Environments." Vadose Zone Journal 11, no. 4:Article No. 0159. PNNL-SA-93024. doi:10.2136/vzj2012.0159
  • Zhang C., L. Slater, G.D. Redden, Y. Fujita, T.C. Johnson, and D. Fox. 2012. "Spectral Induced Polarization Signatures of Hydroxide Adsorption and Mineral Precipitation in Porous Media." Environmental Science & Technology 8, no. 46:4357-4364. PNNL-SA-89457. doi:10.1021/es204404e

2011

  • Dafflon B., W. Barrash, M. Cardiff, and T.C. Johnson. 2011. "Hydrological parameter estimations from a conservative tracer test with variable-density effects at the Boise Hydrogeophysical Research Site." Water Resources Research 47, no. 12:Article No. W12513. PNNL-SA-79976. doi:10.1029/2011WR010789
  • Dafflon B., W. Barrash, M.A. Cardiff, and T.C. Johnson. 2011. "Hydrological parameter estimations from a conservative tracer test with variable-density effects at the Boise Hydrogeophysical Research Site." Water Resources Research 47. PNNL-SA-89456. doi:10.1029/2011WR010789
  • Johnson T.C., M.J. Truex, D.M. Wellman, and J. Marble. 2011. "Characterization and monitoring of subsurface processes using parallel computing and electrical resistivity imaging." AGU Hydrology Section Newsletter. PNNL-SA-80302.
  • Revil A., M. Karaoulis, T.C. Johnson, and A. Kemna. 2011. "Review: Some Low-Frequency Electrical Methods for Subsurface Characterization and Monitoring in Hydrogeology." Hydrogeology Journal 20, no. 4:617-658. PNNL-SA-77010. doi:10.1007/s10040-011-0819-x
  • Vermeul V.R., B.G. Fritz, J.S. Fruchter, W.J. Greenwood, T.C. Johnson, J.A. Horner, and C.E. Strickland, et al. 2011. 100-NR-2 Apatite Treatability Test: Fall 2010 Tracer Infiltration Test (White Paper). PNNL-20322. Richland, WA: Pacific Northwest National Laboratory. 100-NR-2 Apatite Treatability Test: Fall 2010 Tracer Infiltration Test (White Paper)
  • Wellman D.M., M.B. Triplett, M.D. Freshley, M.J. Truex, R.E. Gephart, T.C. Johnson, and G.B. Chronister, et al. 2011. "DEEP VADOSE ZONE APPLIED FIELD RESEARCH CENTER: TRANSFORMATIONAL TECHNOLOGY DEVELOPMENT FOR ENVIRONMENTAL REMEDIATION." In Proceedings of the 37th Annual Radioactive Waste Management Symposium (WM 2011): Global Achievements and Challenges in Waste Management, February 27-March 3, 2011, Phoenix, Arizona, 6, 4969-4982, Paper No. 11074. Tucson, Arizona:WM Symposia. PNNL-SA-76702.
  • Wellman D.M., M.J. Truex, M.D. Freshley, R.E. Gephart, M.B. Triplett, and T.C. Johnson. 2011. Implementation Plan for the Deep Vadose Zone-Applied Field Research Center. PNNL-20209. Richland, WA: Pacific Northwest National Laboratory. Implementation Plan for the Deep Vadose Zone-Applied Field Research Center
  • Wellman D.M., T.C. Johnson, R.M. Smith, M.J. Truex, and H.E. Matthews. 2011. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2011 Annual Report. PNNL-20757. Richland, WA: Pacific Northwest National Laboratory. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2011 Annual Report

Energy and Environment

Core Research Areas

Resources

Contacts