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Tim Johnson

Tim Johnson

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352

PNNL Publications


  • Johnson TC, and DM 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(2):1096-1108.  doi:10.1093/gji/ggv206
  • Johnson TC, DF Rucker, and DR Glaser. 2015. "Near-Surface Geophysics at the Hanford Nuclear Site, the United States." Chapter 11.17 in Treatise on Geophysics, Second Edition, vol. 11, ed. G Schubert, pp. 571-595.  Elsevier, Amsterdam, Netherlands. 
  • Johnson TC, R Versteeg, FD Day-Lewis, W Major, and JW Lane, Jr. 2015. "Time-Lapse Electrical Geophysical Monitoring of Amendment-Based Biostimulation." Ground Water 53(6):920-932.  doi:10.1111/gwat.12291
  • Johnson TC, R Versteeg, JN Thomle, GE Hammond, X Chen, and JM 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(8):6177-6196.  doi:10.1002/2014WR016129
  • Robinson J, TC Johnson, and LD Slater. 2015. "Challenges and opportunities for fractured rock imaging using 3D cross-borehole electrical resistivity." Geophysics 80(2):e49-e61.  doi:10.1190/GEO2014-0138.1
  • Singha K, FD Day-Lewis, TC Johnson, and LD Slater. 2015. "Advances in interpretation of subsurface processes with time-lapse electrical imaging." Hydrological Processes 29(6):15-49-1576.  doi:10.1002/hyp.10280
  • Strickland CE, TC Johnson, and RI Odom. 2015. "Three-Dimensional Fréchet Sensitivity Kernels for Electromagnetic Wave Propagation." Geophysical Journal International 203(1):482-505.  doi:10.1093/gji/ggv272
  • Truex MJ, CE Strickland, M Oostrom, CD Johnson, GD Tartakovsky, TC Johnson, RE Clayton, and GB Chronister. 2015. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring Results, Fiscal Year 2015PNNL-24706, Pacific Northwest National Laboratory, Richland, WA. 
  • Truex MJ, VR Vermeul, D Adamson, M Oostrom, L Zhong, RD Mackley, BG Fritz, JA Horner, TC Johnson, JN Thomle, DR Newcomer, CD Johnson, M Rysz, TW Wietsma, and CJ Newell. 2015. "Field Test of Enhanced Remedial Amendment Delivery Using a Shear-Thinning Fluid." Ground Water Monitoring and Remediation 35(3):34-45. 



  • Johnson TC, and DM Wellman. 2013. Re-Inversion of Surface Electrical Resistivity Tomography Data from the Hanford Site B-ComplexPNNL-22520; RPT-DVZ-AFRI-014, Pacific Northwest National Laboratory, Richland, WA. 
  • Johnson TC, M Oostrom, MJ Truex, JN Thomle, and TW Wietsma. 2013. "Determination of water saturation using gas phase partitioning tracers and time-lapse electrical conductivity measurements." Vadose Zone Journal 12(2):, doi:10.2136/vzj2012.0142
  • Truex MJ, TC Johnson, CE Strickland, JE Peterson, and SS Hubbard. 2013. "Monitoring Vadose Zone Desiccation with Geophysical Methods." Vadose Zone Journal 12(2):, doi:10.2136/vzj2012.0147
  • Truex MJ, M Oostrom, CE Strickland, TC Johnson, CD Johnson, RE Clayton, and GB Chronister. 2013. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Interim Post-Desiccation Monitoring ResultsPNNL-22826, Pacific Northwest National Laboratory, Richland, WA. 
  • Wallin EL, TC Johnson, WJ Greenwood, and JM 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(3):1693-1708.  doi:10.1002/wrcr.20119
  • Wellman DM, MJ Truex, TC Johnson, AL Bunn, and EC Golovich. 2013. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2012 Annual ReportPNNL-22322, Pacific Northwest National Laboratory, Richland, WA. 


  • Johnson TC, L Slater, D Ntarlagiannis, FD 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:Article No. W07506.  doi:10.1029/2012WR011893
  • Johnson TC, RJ Versteeg, ML Rockhold, LD Slater, D Ntarlagiannis, WJ Greenwood, and JM Zachara. 2012. "Characterization of a contaminated wellfield using 3D electrical resistivity tomography implemented with geostatistical, discontinuous boundary, and known conductivity constraints." Geophysics 77(6):Article No. EN85.  doi:10.1190/geo2012-0121.1
  • Meyer J, EW Bethel, JL Horsman, SS Hubbard, H Krishnan, A Romosan, E Keating, LM Monroe, R Strelitz, P Moore, G Taylor, B Torkian, TC Johnson, and I Gorton. 2012. "Visual Data Analysis as an Integral Part of Environmental Management." IEEE Transactions on Visualization and Computer Graphics 18(12):2088 - 2094.  doi:10.1109/TVCG.2012.278
  • Revil A, M Karaoulis, TC Johnson, and A Kemna. 2012. "Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology." Hydrogeology Journal 20(4):617-658.  doi:10.1007/s10040-011-0819-x
  • Szecsody JE, MJ Truex, L Zhong, TC Johnson, N Qafoku, MD Williams, WJ Greenwood, EL Wallin, JR Bargar, and DK Faurie. 2012. "Geochemical and Geophysical Changes during Ammonia Gas Treatment of Vadose Zone Sediments for Uranium Remediation." Vadose Zone Journal 11(4):, doi:10.2136/vzj2011.0158
  • Truex MJ, M Oostrom, CE Strickland, TC Johnson, VL Freedman, CD Johnson, WJ Greenwood, AL Ward, RE Clayton, MJ Lindberg, JE Peterson, S Hubbard, GB Chronister, and MW Benecke. 2012. Deep Vadose Zone Treatability Test for the Hanford Central Plateau: Soil Desiccation Pilot Test ResultsPNNL-21369, Pacific Northwest National Laboratory, Richland, WA. 
  • Wellman DM, MD Freshley, TC Johnson, and AL Miracle. 2012. "Contaminants in Vadose Zone Environments." Vadose Zone Journal 11(4):Article No. 0159.  doi:10.2136/vzj2012.0159
  • Zhang C, L Slater, GD Redden, Y Fujita, TC Johnson, and D Fox. 2012. "Spectral Induced Polarization Signatures of Hydroxide Adsorption and Mineral Precipitation in Porous Media." Environmental Science & Technology 8(46):4357-4364.  doi:10.1021/es204404e


  • Johnson TC, MJ Truex, DM Wellman, and J Marble. 2011. "Characterization and monitoring of subsurface processes using parallel computing and electrical resistivity imaging." AGU Hydrology Section Newsletter (December 2011):24-28. 
  • Dafflon B, W Barrash, MA Cardiff, and TC Johnson. 2011. "Hydrological parameter estimations from a conservative tracer test with variable-density effects at the Boise Hydrogeophysical Research Site." Water Resources Research 47:Article No. W12513.  doi:10.1029/2011WR010789
  • Revil A, M Karaoulis, TC Johnson, and A Kemna. 2011. "Review: Some Low-Frequency Electrical Methods for Subsurface Characterization and Monitoring in Hydrogeology." Hydrogeology Journal 20(4):617-658.  doi:10.1007/s10040-011-0819-x
  • Vermeul VR, BG Fritz, JS Fruchter, WJ Greenwood, TC Johnson, JA Horner, CE Strickland, JE Szecsody, and MD Williams. 2011. 100-NR-2 Apatite Treatability Test: Fall 2010 Tracer Infiltration Test (White Paper) PNNL-20322, Pacific Northwest National Laboratory, Richland, WA. 
  • Wellman DM, TC Johnson, RM Smith, MJ Truex, and HE Matthews. 2011. Deep Vadose Zone-Applied Field Research Initiative Fiscal Year 2011 Annual ReportPNNL-20757, Pacific Northwest National Laboratory, Richland, WA. 
  • Wellman DM, MB Triplett, MD Freshley, MJ Truex, RE Gephart, TC Johnson, GB Chronister, KD Gerdes, S Chamberlain, J Marble, and R Ramirez. 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, vol. 6, pp. 4969-4982, Paper No. 11074.  WM Symposia, Tucson, AZ. 
  • Wellman DM, MJ Truex, MD Freshley, RE Gephart, MB Triplett, and TC Johnson. 2011. Implementation Plan for the Deep Vadose Zone-Applied Field Research CenterPNNL-20209, Pacific Northwest National Laboratory, Richland, WA. 


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