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Civil and Environmental Engineering Faculty

Dr. Tim Ginn

Tim Ginn



Sloan Hall, 125


(509) 335-0528


(509) 335-7632



  • Ph.D., Civil Engineering, 1988, Purdue University
  • M.S., Civil Engineering, 1985, Purdue University
  • B.S., Classics, Environmental Sciences, 1982, University of Virginia

Professional Experience

  • Interim Associate Chair, Civil and Environmental Engineering, WSU,2021 – Present
  • Professor, Civil and Environmental Engineering, WSU, 2016 – Present
  • Professor of Civil & Environmental Engineering, UC Davis, 2001-2015
  • Associate Professor of Civil & Environmental Engineering, UC Davis, 1999-2001
  • Acting Associate Professor of Civil & Environ. Engineering, UC Davis, 1997-1999
  • Senior Research Scientist, Battelle Pacific Northwest National Lab, 1994-1997
  • Research Scientist, Battelle Pacific Northwest National Lab, 1991-1994
  • Alexander Hollaender Distinguished Postdoctoral Fellow, Battelle PNNL, 1989-1991
  • Visiting Assistant Professor, Civil Engineering, Purdue University, 1988-1989


  • Crimson Spirit Award, Washington State University, 2022
  • Outstanding Engineering Mid-Career Award, College of Engineering, UC Davis, 2010
  • Excellence in Reviewing, American Geophysical Union, 1991 and 2014

Research Interests

  • Biogeochemical reactive transport
  • Exposure time in mass balance modeling and hydrologic age
  • Colloid filtration theory and microbial transport
  • Ureolytic calcite precipitation in granular media
  • Inverse problems in hydrology
  • Horizontal gene transfer
  • Alternative fuels environmental risk assessment
  • Nonlocal transport processes and modeling


  • Reactive Transport
  • Hydrogeology
  • Probability and Statistics
  • Fluid Mechanics


  • Tsai, C. H., D. F. Rucker, S. C. Brooks, T. R. Ginn, & K. C. Carroll, 2022. Transient storage model parameter optimization using the simulated annealing method. Water Resources Research, 58, e2022WR032018.
  • Gurung, D. and T. R. Ginn 2020. Mixing ratios with age: Application to preasymptotic one‐dimensional equilibrium bimolecular reactive transport in porous media. Water Resources Research, 56, e2020WR027629.
  • Ali, A. A., D. Gurung, D., and T. R. Ginn 2020. A solution for mixing‐limited equilibrium reactions in idealized radial flow. Water Resources Research, 56, e2019WR026477.
  • Rangelov, M., S. Nassiri, D. Gurung, T. R. Ginn 2020 Advanced Calibration of Historic Apparent Moisture Diffusivity Models for Mortar, ACI Materials Journal . Mar2020, Vol. 117 Issue 2, p65-77.
  • Engdahl, N. B., J. L. McCallum, and T. R. Ginn, 2019. Can convolution and deconvolution be used as tools for modeling multi-component, mixing-limited reaction networks? Water Resources Research, 55, 6302–6315.
  • Nassar, M., D. Gurung, M. Bastani, T. R. Ginn, B. Shafei, M. G. Gomez, C. M. R. Graddy, D. C. Nelson, J. T. DeJong. 2018. Large-Scale Experiments in Microbially-Induced Calcite Precipitation (MICP): Reactive Transport Model Development and Prediction, Water Resources Research 54, 10.1002/2017WR021488.
  • Ginn, T. R. 2018. Modeling bimolecular reactive transport with mixing-limitation: Theory and application to column experiments. Water Resources Research, 54:256-270. org/10.1002/2017WR022120.
  • Zamani, K., and T. R. Ginn 2017. Hydrogeologic Characterization, Chapter 47 in Singh, V. P. (ed.), Handbook of Applied Hydrology 2nd Edition, McGraw-Hill Inc, ISBN 978-0-07-183509-1.
  • Zamani, K., T. R. Ginn, and M. K. Nassar 2017. Pollutant Transport in the Vadose Zone, Chapter 68 in Singh, V. P. (ed.), Handbook of Applied Hydrology 2nd Edition, McGraw-Hill Inc, ISBN 978-0-07-183509-1.
  • Ginn T., L. Schreyer, K. Zamani 2017. Phase exposure-dependent exchange. Water Resour. Res. 53: 619–632, doi: 10.1002/2016WR019755.
  • Ginn, T., L. Schreyer, X. Sanchez-Vila, M. K. Nassar, A. A. Ali, S. Kräutle 2017. Revisiting the Analytical Solution Approach to Mixing-Limited Equilibrium Multicomponent Reactive Transport Using Mixing Ratios: Identification of Basis, Fixing an Error, and Dealing With Multiple Minerals. Water Resources Research, 53(11), 9941–9959.
  • Sengör S., G. Singh, A. Donalkhova, N. Spycher, T. Ginn, B. Peyton, R. Sani. 2016. Impact of different environmental conditions on the aggregation of biogenic U (IV) nanoparticles synthesized by Desulfovibrio alaskensis G20, Biometals 29(6):965-980.
  • Gomez M., C. Anderson, C. Graddy, J. DeJong, D. Nelson, T. Ginn. 2016. Large-Scale Comparison of Bioaugmentation and Biostimulation Approaches for Biocementation of Sands, ASCE J Geotech. and Geoenv. Eng. 143(5), paper 04016124.
  • Babey T., J. de Dreuzy, T. Ginn. 2016. From conservative to reactive transport under diffusion-controlled conditions. Water Resources Research, 52(5):3685-3700.
  • de Dreuzy J., T. Ginn. 2016. Residence times in subsurface hydrological systems, introduction to the Special Issue, J Hydrology, 543(PartA):1-6.
  • Marçais, J., J.-R. de Dreuzy, T. R. Ginn, P. Rousseau-Guetind, S. Leray, 2015, Inferring transit time distributions from atmospheric tracer data: Assessment of the predictive capacities of Lumped Parameter Models on a 3D crystalline aquifer model, Hydrology, 525:619-631.
  • Lu, N., A. Massoudieh, X Liang, T. Kamai, J. L. Zilles, T. H. Nguyen and T. R. Ginn, A kinetic model of gene transfer via natural transformation of Azotobacter vinelandii , Environmental Science: Water Research & Technology 1(3):363-374, 2015.
  • LeBorgne, T., T. R. Ginn, and M. Dentz, Impact of Fluid Deformation on Mixing-Induced Chemical Reactions in Heterogeneous Flows, Geophysical Res. Letters, 41(22):7898–7906, 2014.
  • Sutton, P., and T. R. Ginn, Sustainable in-well vapor stripping: a design, analytical model, and pilot study for groundwater remediation, J. Contam. Hydrol., 171:32-41, 2014.
  • Nassar, M. and T. R. Ginn, Cauchy data requirement of the inverse problem of the mean age equation, Water Resources Research 50(4):3583-3588, 2014b.
  • Nassar, M. and T. R. Ginn, Cauchy data requirement of the inverse problem of the mean age equation, Water Resources Research 50(4):3583-3588, 2014b.
  • Ginn, T. R., M. K. Nassar, T. Kamai, K. Klise, V. Tidwell, and S. McKenna, On a recent solute transport laboratory experiment involving sandstone and its modeling, Water Resour. Res. 49(11):7327-7338, 2013.
  • Spycher, N.F., M. Issarangkun, B. D. Stewart, S. S. Sengör, E. Belding, T. R. Ginn, B. M. Peyton, R. K. Sani, Biogenic uraninite precipitation and its reoxidation by iron(III) (hydr)oxides: A reaction modeling approach, Geochimica et Cosmochimica Acta, 75 (16), pp. 4426-4440, 2011.
  • Nelson, K. E. and T. R. Ginn, New collector efficiency equation for colloid filtration in both natural and engineered flow conditions, Water Resour. Res. 47(5) Art. W05543, 2011.
  • Barkouki, T.H., B. C. Martinez, B. M. Mortensen, T. S. Weathers, J. D. DeJong, T. R. Ginn, N. F. Spycher, R. W. Smith, Y. Fujita, Y., Forward and Inverse Biogeochemical Modeling of Microbially Induced Calcite Precipitation in Half-Meter Column Experiments, Transport in Porous Media, 90(1):23-39, 2011.
  • Ginn, T. R., Generalization of the Multirate Basis for Time-Convolution to Unequal Forward and Reverse Rates and Connection to Reactions with Memory, Water Resour. Res. 45, W12419, 2009.
  • Ginn, T. R., H. Haeri, L. Foglia, and A. Massoudieh, Notes on groundwater age in forward and inverse modeling, Transport in Porous Media,79:117-134, 2009.
  • Woolfenden L. and T.R. Ginn. Modeled Groundwater Age Distributions. Ground Water, 47(4): 547-557, 2009.
  • Massoudieh A. and T. R. Ginn, Modeling Colloid-Enhanced Contaminant Transport in Storm-water Infiltration Basin Best Management Practices, Vadose Zone J., 7(4):1215-1222, 2008.