Timothy Scheibe

Director of Program Development, Earth & Biological Sciences Directorate

Biography

Tim Scheibe is the Director of Program Development for the Earth and Biological Sciences Directorate. In this role he stewards PNNL’s research programs sponsored by the U.S. Department of Energy, Office of Biological and Environmental Research (BER) and the Department of Health and Human Services.

He joined PNNL in 1992 as a research scientist and has led several large research projects funded by BER and other sponsors. He is internationally known as an expert in the field of environmental hydrogeology, with emphasis on multi-scale biogeochemical reactive transport modeling. Key areas of research have been in microbial transport in groundwater systems, groundwater bioremediation, coupling microbial metabolic models with groundwater reactive transport simulations, and multiscale simulation of coupled flow, transport and biogeochemical processes at cellular, pore and continuum scales. His projects have included both computational and field experimental elements.

Research Interest

Groundwater-surface water interactions and controls on watershed biogeochemistry.
Characterization and modeling of natural subsurface heterogeneity and its impacts on contaminant transport in groundwater systems.
Subsurface biogeochemistry including microbial transport and bioremediation of metals and radionuclides.
Pore scale and multiscale modeling of coupled biogeochemical processes in porous media.
Parameter estimation and conceptual model uncertainty characterization.

Education

PhD in Civil Engineering, Stanford University, 1993
MS in Civil Engineering, University of Washington, 1987
BS in Geological Engineering, Washington State University, 1984

Affiliations and Professional Service

Member, American Geophysical Union (AGU)
Member, International Society for Subsurface Microbiology
Member (2005-2011) and Chair (2007-2008), AGU Hydrogeology Technical Committee
Co-Coordinator, AGU Hydrology Section Fall Meeting Student Evaluation (2006)
Member, AGU Ad-Hoc Committee on the Future of the Fall Meeting (2007)
AGU Spring Meeting Program Chair, Hydrology Section, 2009
Associate Editor, Ground Water (2001-2019)
Editorial Board Member, PeerJ (2017-current)
Editorial Board Member, Water (2018-current)
Editorial Board Member, Frontiers in Water (2019-current)
Past Associate Editor, Hydrogeology Journal (2003-2007)

Awards and Recognitions

Henry Darcy Distinguished Lecturer, National Ground Water Association, International Year-Long Lectureship, 2010
EMSL Wiley Research Fellow, 2013
PNNL Laboratory Fellow, 2016

Publications

Journal Articles and Book Chapters

Stegen J., Burgin A.J., Busch M.H., Fisher J.B., Ladau J., Abrahamson J., Kinsman-Costello L., Li L., Chen X., Datry T., McDowell N., Tatariw C., Braswell A., Deines J.M., Guimond J.A., Regier P., Rod K., Bam E.K.P., Fluet-Chouinard E., Forbrich I., Jaeger K.L., O’Meara T., Scheibe T., Seybold E., Sweetman J.N., Zheng J., Allen D.C., Herndon E., Middleton B., Painter S., Roche K., Scamardo J., Vander Vorste R., Boye K., Wohl E., Zimmer M., Hondula K., Laan M., Marshall A., and Patel K.F. (2025) Reviews and syntheses: Variable inundation across Earth’s terrestrial systems. Biogeosciences, 22(4): 995-1034, doi: 10.5194/bg-22-995-2025.

Song H.-S., Ahamed F., Lee J.-Y., Henry C.S., Edirisinghe J.N., Nelson W.C., Chen X., Moulton J.D., and Scheibe T.D. (2025) Coupling flux balance analysis with reactive transport modeling through machine learning for rapid and stable simulation of microbial metabolic switching. Scientific Reports, 15(1): 6042, doi: 10.1038/s41598-025-89997-9.

Zheng J., Scheibe T.D., Mayes M.A., Weintraub M.N., Megoningal J.P. and Bailey V.L. (2025) AquaMEND: Reconciling multiple impacts of salinization on soil carbon biogeochemistry. Soil Biology and Biochemistry, 203: 109745, doi: 10.1016/j.soilbio.2025.109745.

Roebuck J.A. Jr., Grieger S., Barnes M.E., Gillespie X., Bladon K.D., Bailey J.D., Graham E.B., Chu R., Kew W., Scheibe T.D., and Myers-Pigg A.N. (2025) Molecular shifts in dissolved organic matter along a burn severity continuum for common land cover types in the Pacific Northwest, USA. Science of the Total Environment, 958: 178040, doi: 10.1016/j.scitotenv.2024.178040.

Chen Y., Bao J., Chen R., Li B., Yang Y., Renteria L., Delgado D., Forbes B., Goldman A.E., Simhan M., Barnes M.E., Laan M., McKever S., Hou Z., Chen X., Scheibe T., and Stegen J. (2024) Quantifying streambed grain size, uncertainty, and hydrobiogeochemical parameters using machine learning model YOLO. Water Resources Research, 60(11); e2023WR036456, doi: 10.1029/2023WR036456.

Gary, S.F., Scheibe T.D., Rexer E., Torreira A.V., Garayburu-Caruso V.A., Goldman A., and Stegen J.C. Prediction of distributed river sediment respiration rates using community-generted data and machine learning. Journal of Geophysical Research: Machine Learning and Computation, 1(3): e2024JH000199, doi: 10.1029/2024JH000199.

Bao J., Song X., Chen Y., Fang Y., Lin X., Hou Z., Duan Z., Ren H., Perkins W., He X., and Scheibe T. (2024) On the transferability of residence time distributions in two 10-km long river sections with similar hydromorphic units. Journal of Hydrology 640: 131723, doi: 10.1016/j.jhydrol.2024.131723.

Zheng J., Scheibe T.D., Boye K., and Song H.-S. (2024) Thermodynamic control on the decomposition of organic matter across different electron acceptors. Soil Biology and Biochemistry, 193: 109364, doi: 10.1016/j.soilbio.2024.109364.

Myers-Pigg A.N., Grieger S., Roebuck J.A. Jr., Barnes M.E., Bladon K.D., Bailey J.D., Barton R., Chu R.K., Graham E.B., Homolka K.K., Kew W., Lipton A.S., Scheibe T., Toyoda J.G. and Wagner S. Experimental open air burning of vegetation enhances organic matter chemical heterogeneity compared to laboratory burns. Environmental Science & Technology, 58(22): 9679-9688, doi: 10.1021/acs.est.3c10826.

Gonzalez-Duque D., Gomez-Velez J.D., Zarnetske J.P., Chen X., and Scheibe T.D. (2024) Sinuosity-driven hyporheic exchange: Hydrodynamics and biogeochemical potentials. Water Resources Research, 60(4): e2023WR036023, doi: 10.1029/2023WR036023.

Perez D., Gomez-Velez J.D., Chen X., and Scheibe T. (2023) The directional unit hydrograph model: Connecting streamflow response to storm dynamics. Journal of Hydrology, 627: 130422, doi: 10.1016/j.jhydrol.2023.130422.

Karra S., Apte S., He X., and Scheibe T. (2023) Pore-resolved investigation of turbulent open channel flow over a randomly packed permeable sediment bed. Journal of Fluid Mechanics, 971: A23, doi: .

Ahamed, F., You Y., Burgin A., Stegen J.C., Scheibe T.D., and Song H.-S. (2023) Exploring the determinants of organic matter bioavailability through substrate-explicit thermodynamic modeling. Frontiers in Water, 5: 1169701, doi: 10.3389/frwa.2023.1169701.

Dwivedi D., Steefel C.I., Arora B., Banfield J., Bargar J., Boyanov M.I., Brooks S.C., Chen X., Hubbard S.S., Kaplan D., Kemner K.M., Nico P.S., O’Loughlin E.J., Pierce E.M., Painter S.L., Scheibe T.D., Wainwright H.M., Williams K.H., and Zavarin M. (2022) From legacy contamination to watershed systems science: A review of scientific insights and technologies developed through DOE-supported research in water and energy security. Environmental Research Letters, 17(4): 043004, doi: 10.1088/1748-9326/ac59a9.

Bao J., Chen X., Fang Y., Song X., Perkins W., Duan Z., Shuai P., Ren H., Hou Z., Richmond M., He X., and Scheibe T. (2022) Modeling framework for evaluating the impacts of hydrodynamic pressure on hydrologic exchange fluxes and residence times for a large-scale river section over a long-term period. Environmental Modelling & Software, 148: 105277, doi: 10.1016/j.envsoft.2021.105277

Perez L.J., Parashar R., Plymale A. and Scheibe T.D. (2022) Contributions of biofilm-induced flow heterogeneities to solute retention and anomalous transport features in porous media. Water Research, 209: 117896, doi: 10.1016/j.watres.2021.117896.

Chen X., Bao J., Fang Y., Perkins W.A., Ren H., Song X., Duan Z., Hou Z., He X., and Scheibe T.D. (2022) Modeling of streamflow in a 30 km long reach spanning 5 years using OpenFOAM 5.x. Geoscientific Model Development, 15(7), 2917–2947, doi: 10.5194/gmd-15-2917-2022.

Perez G., Gomez-Velez J.D., Chen X., Scheibe T., Chen Y., and Bao J. (2021) Identification of characteristic spatial scales to improve the performance of analytical spectral solutions to the groundwater flow equation. Water Resources Research, 57(12): e2021WR031044, doi: 10.1029/2021WR031044.

Chen X., Lee R.M., Dwivedi D., Son K., Fang Y., Zhang X., Graham E., Stegen J., Fisher J.B., Moulton D., and Scheibe T.D. (2021) Integrating field observations and process-based modeling to predict watershed water quality under environmental perturbations. Journal of Hydrology, 602: 125762, doi: 10.1016/j.jhydrol.2020.125762.

Hou Z., Ren H., Murray C.J., Song X., Fang Y., Arntzen E.V., Chen X., Stegen J.C., Huang M., Gomez-Velez J.D., Duan Z., Perkins W.A., Richmond M.C., and Scheibe T.D. (2021) A novel construct for scaling groundwater-river interactions based on machine-guided hydromorphic classification. Environmental Research Letters, 16(10): 104016, doi: 10.1088/1748-9326/ac24ce.

Song X., Fang Y., Bao J., Ren H., Duan Z., Perkins W., Zhou H., Hou Z., Chen Y., and Scheibe T. (2021) Scale-dependent spatial variabilities of hydrological exchange flows and transit time in a large regulated river. Journal of Hydrology, 598: 126283, doi: 10.1016/j.jhydrol.2021.126283.

Dwivedi D., Godsey S.E., and Scheibe T.D. (2021) Linking hydrological and biogeochemical processes in riparian corridors. Frontiers in Water, 3: 693763, doi: 10.3389/frwa.2021.693763.

Ren H., Song X., Fang Y., Hou Z., and Scheibe T.D. (2021) Machine learning analysis of hydrologic exchange flows and transit time distributions in a large regulated river. Frontiers in Artificial Intelligence, 4: 648071, doi: 10.3389/frai.2021.648071.

Song H.-S., Stegen J. C., Graham E. B. and Scheibe T. D. (2021) Historical contingency in microbial resilience to hydrologic perturbations. Frontiers in Water, 3; doi: 10.3389/frwa.2021.590378.

Fang Y., Song X., Ren H., Perkins W. A., Shuai P., Richmond M. C., Hou Z., Bao J., Chen X. and Scheibe T. D. (2020) High-performance simulation of dynamic hydrologic exchange and implications for surrogate flow and reactive transport modeling in a large river corridor. Frontiers in Water, 2; doi: 10.3389/frwa.2020.564211.

Lin X., Ren H., Goldman A., Stegen J. C. and Scheibe T. D. (2020) WHONDRS-GUI: A web application for global survey of surface water metabolites. PeerJ, 8, e9277; doi: 10.7717/peerj.9277.

Ren H., Hou Z., Duan Z., Song X., Perkins W. A., Richmond M. C., Arntzen E. V. and Scheibe T. D. (2020) Spatial mapping of riverbed grain-size distribution using machine learning. Frontiers in Water, 2; doi: 10.3389/frwa.2020.551627.

Song H.-S., Stegen J. C., Graham E. B., Lee J.-Y., Garayburu-Caruso V. A., Nelson W. C., Chen X., Moulton J. D. and Scheibe T. D. (2020) Representing organic matter thermodynamics in biogeochemical reactions via substrate-explicit modeling. Frontiers in Microbiology, 11; doi: 10.3389/fmicb.2020.531756.

Yang, X., R. Parashar, N. L. Sund, A. E. Plymale, T. D. Scheibe, D. Hu, and R. T. Kelly, “On modeling ensemble transport of metal reducing motile bacteria”, Scientific Reports, 9:14638, doi: 10.1038/s41598-019-51271-0, 2019.

Graham, E. B., Stegen J. C., Huang, M., Chen, X. and Scheibe, T. D., “Subsurface biogeochemistry is a missing link between ecology and hydrology in dam-impacted river corridors,” Science of the Total Environment, 657:435-445, doi:10.1016/j.scitotenv.2018.11.414, 2019

Hou, Z, T. D. Scheibe, C. J. Murray, W. A. Perkins, E. V. Arntzen, H. Ren, R. D. Mackley, and M. C. Richmond, “Identification and mapping of riverbed sediment facies in the Columbia River through integration of field observations and numerical simulations,” Hydrological Processes, 33, 1245-1259, doi: 10.1002/hyp.13396, 2019.

Meile C. and Scheibe T. D., “Reactive transport modeling of microbial dynamics,” Elements, 15(2): 111-116, doi: 10.2138/gselements.15.2.111, 2019.

Fang, Y., S. B. Yabusaki, A. Ahkami, X. Chen, and T. D. Scheibe, “A rhizosphere modeling capability to study the effect of root system architecture on soil water and reactive transport,” Plant and Soil, doi:10.1007/s11104-019-04068-z., 2019.

Mays, D. C. and T. D. Scheibe, “Groundwater contamination, subsurface processes, and remediation methods: Overview of the special issue of Water on groundwater contamination and remediation, Water, 10(12), 1708, doi: 10.3390/w10121708, 2018.

Meile C. and Scheibe T. D., “Reactive transport modeling and biogeochemical cycling,” In Reactive Transport Modeling: Applications in Subsurface Energy and Environmental Problems, (eds. Y. Xiao, F. Whitaker, T. Xu, and C. Steefel). Wiley Press, 560 pp. ISBN: 978-1-119-06002-4, 2018.

Korneev, S. V., Yang, X., Zachara, J. M., Scheibe, T. D., & Battiato, I., “Downscaling-based segmentation for unresolved images of highly heterogeneous granular porous samples,” Water Resources Research, 54, doi: 10.1002/2018WR022886, 2018.

Yang, X., Y. Mehmani, W. A. Perkins, A. Pasquali, M. Schoenherr, K. Kim, M. Perego, M. L. Parks, N. Trask, M. T. Balhoff, M. C. Richmond, M. Geier, M. Krafczyk, L.-S. Luo, A. M. Tartakovsky, and T. D. Scheibe, “Intercomparison of 3D pore-scale flow and solute transport simulation methods,” Advances in Water Resources, 95: 176-189, doi:10.106/j.advwatres.2015.09.015, 2016.

Yang, X., T. Varga, C. Liu, and T. D. Scheibe, “What Can We Learn from In-Soil Imaging of a Live Plant: X-ray Computed Tomography and 3D Numerical Simulation of Root-Soil System,” Rhizosphere, 3(2): 259–262, doi: 10.1016/j.rhisph.2017.04.017, 2017.

Groen D., Krzhizhanovskaya V., Bosak B., Scheibe T. and Hoekstra A. “Multiscale modeling and simulation, 13^th international workshop,” Procedia Computer Science 80:1242-1243, doi: 10.1016/j.procs.2016.05.494, 2016.

Scheibe, T. D., W. A. Perkins, M. C. Richmond, M. I. McKinley, P. D. J. Romero-Gomez, M. Oostrom, T. W. Wietsma, J. A. Serkowski, and J. M. Zachara, “Pore-scale and multiscale numerical simulation of flow and transport in a laboratory-scale column,” Water Resources Research 51(2): 1023-1035, 10.1002/2014wr015959, 2015.

Scheibe, T. D., E. M. Murphy, X. Chen, A. K. Rice, K. C. Carroll, B. J. Palmer, A. M. Tartakovsky, I. Battiato, and B. D. Wood, “An analysis platform for multiscale hydrogeologic modeling with emphasis on hybrid multiscale methods,” Groundwater, 53(1): 38-56, doi: 10.1111/gwat.12179, 2015.

Yang, X., M. C. Richmond, T. D. Scheibe, W. A. Perkins, and H. Resat, “Flow partitioning in fully saturated soil aggregates,” Transport in Porous Media, 103(2): 295-314, doi:10.1007/s11242-014-0302-y, 2014.

Richmond, M. C., W. A. Perkins, T. D. Scheibe, A. Lambert, and B. D. Wood, “Flow and axial dispersion in a wavy-walled tube: Effects of inertial and unsteady flows,” (Invited) Advances in Water Resources 62; 215-226, doi:10.1016/j.advwatres.2013.06.014, 2013.

Zhao, J., R. T. D. Scheibe and R. Mahadevan, “Model-based analysis of mixed uranium(VI) reduction by biotic and abiotic pathways during in situ bioremediation,” Chemical Geology 357: 215-222, doi:10.1016/j.chemgeo.2013.08.037, 2013.

Tartakovsky, G. D., A. M. Tartakovsky, T. D. Scheibe, Y. Fang, R. Mahadevan and D. R. Lovley, “Pore-scale simulation of microbial growth using a genome-scale metabolic model: Implications for Darcy-scale reactive transport”, Advances in Water Resources 59: 256-270, doi:10.1016/j.advwatres.2013.05.007, 2013.

Scheibe, T. D., Z. Hou, B. J. Palmer and A. M. Tartakovsky, “Pore-scale simulation of intragranular diffusion: Effects of incomplete mixing on macroscopic manifestations,” Water Resources Research 49(7): 4277-4294,doi:10.1002/wrcr.20333, 2013.

Fang, Y., B. N. Nguyen, K. C. Carroll, Z. Xu, S. B. Yabusaki, T. D. Scheibe, and A. H. R. Bonneville, “Development of a coupled thermo-hydro-mechanical model in discontinuous media for carbon sequestration,” International Journal of Rock Mechanics and Mining Sciences, 62:138-147, doi:10.1016/j.ijrmms.2013.05.002, 2013.

Keyes, D. E., L. C. McInnes, C. Woodward, W. Gropp, E. Myra, M. Pernice, J. Bell, J. Brown, A. Clo, J. Connors, E. Constantinescu, D. Estep, K. Evans, C. Farhat, A. Hakim, G. Hammond, G. Hansen, J. Hill, T. Isaac, X. Jiao, K. Jordan, D. Kaushik, E. Kaxiras, A. Koniges, K. Lee, A. Lott, Q. Lu, J. Magerlein, R. Maxwell, M. McCourt, M. Mehl, R. Pawlowski, A. P. Randles, D. Reynolds, B. Riviere, U. Rude, T. Scheibe, J. Shadid, B. Sheehan, M. Shephard, A. Siegel, B. Smith, X. Tang, C. Wilson and B. Wohlmuth, “Multiphysics simulations: Challenges and Opportunities,” International Journal of High Performance Computing Applications, 27(1):4-83, doi:10.1177/1094342012468181,2013.

Yang, X., T. D. Scheibe, M. C. Richmond, W. A. Perkins, S. J. Vogt, S. L. Codd, J. D. Seymour, and M. I. McKinley, “Direct numerical simulation of pore-scale flow in a bead pack: Comparison with magnetic resonance imaging observations”, Advances in Water Resources, 54:228-241, doi:10.1016/j.advwatres.2013.01.009, 2013.

Landkamer, L. L., R. W. Harvey, T. D. Scheibe, and J. N. Ryan, “Colloid transport in saturated porous media: Elimination of attachment efficiency in a new colloid transport model,” Water Resources Research, 49: 2952-2965, doi:10.1002/wrcr.20195, 2013.

Xu, Z., Y. Fang, T. D. Scheibe, and A. Bonneville, “A fluid pressure and deformation analysis for geological sequestration of carbon dioxide,” Computers & Geosciences 46: 31-37, 2012.

Tartakovsky, A. M. and T. D. Scheibe, “Dimension reduction method for advection-diffusion-reaction systems,” Advances in Water Resources, 34(12): 1616-1626, doi:10.1016/j.advwatres.2011.07.011, 2011.

Zhao, J., T. D. Scheibe and R. Mahadevan, “Model-based analysis of the role of biological, hydrological and geochemical factors affecting uranium bioremediation,” Biotechnology and Bioengineering 108(7): 1537-1548, 2011.

Xu Z., P. Meakin, A. Tartakovsky, and T. Scheibe "Dissipative-particle-dynamics model of biofilm growth" Physical Review E 83, 066702, DOI: 10.1103/PhysRevE.83.066702, 2011.

Scheibe, T. D., S. S. Hubbard, M. F. DeFlaun, and T. C. Onstott, “Lessons Learned from Bacterial Transport Research at the South Oyster Site,” Ground Water, 49(5): 745-763, DOI:10.1111/j.1745-6584.2011.00831.x, 2011.

Battiato, I., D. M. Tartakovsky, A. M. Tartakovsky, and T. D. Scheibe, “Hybrid models of reactive transport in porous and fractured media,” Advances in Water Resources, 34(9): 1140-1150, doi:10.1016/j.advwatres.2011.01.012, 2011.

Fang, Y., T. D. Scheibe, R. Mahadevan, S. Garg, P. E. Long, and D. R. Lovley, “Direct coupling of a genome-scale microbial in silico model and a groundwater reactive transport model,” Journal of Contaminant Hydrology 122: 96-103, 2011.

Ramanathan, R., A. Guin, R. W. Ritzi Jr., D. F. Dominic, V. L. Freedman, T. D. Scheibe, and I. A. Lunt, "Simulating the heterogeneity in braided channel belt deposits: 1. A geometric-based methodology and code," Water Resources Research, 46:W04515, doi:10.1029/2009WR008111, 2010.

Guin, A., R. Ramanathan, R. W. Ritzi Jr., D. F. Dominic, I. A. Lunt, T. D. Scheibe, and V. L. Freedman, " Simulating the heterogeneity in braided channel belt deposits: 2. Examples of results and comparison to natural deposits," Water Resources Research, 46:W04561, doi:10/1029WR008112, 2010.

Zhao, J., Y. Fang, T. D. Scheibe, D. R. Lovley, and R. Mahadevan, “Modeling and sensitivity analysis of electron capacitance for Geobacter in sediment environments,” Journal of Contaminant Hydrology (invited), 112(1-4):30-44, 2010.

Palmer, B. J., V. Gurumoorthi, A. M. Tartakovsky, and T. D. Scheibe, "A Component Based Framework for Smoothed Particle Hydrodynamics Simulations of Reactive Fluid Flow in Porous Media," International Journal of High Performance Computing Applications 24(2):228-239, 2010.

Battiato, I., D. M. Tartakovsky, A. M. Tartakovsky, and T. Scheibe, "On breakdown of macroscopic models of mixing-controlled heterogeneous reactions in porous media," Advances in Water Resources, 32(11):1663-1673, 2009.

Tartakovsky, A. M , G. D. Tartakovsky, and T. D. Scheibe, "Effects of incomplete mixing on multicomponent reactive transport," Advances in Water Resources, 32(11):1674-1679, 2009.

Tartakovsky, A. M., T. D. Scheibe, and P. Meakin, “Pore-scale model for reactive transport and biomass growth,” Journal of Porous Media, 12(5): 417-434, DOI:10.1615/JPorMedia.v12.i5.30, 2009.

Scheibe, T. D., R. Mahadevan, Y. Fang, S. Garg, P. E. Long, and D. R. Lovley, “Coupling a Genome-Scale Metabolic Model with a Reactive Transport Model to Describe In Situ Uranium Bioremediation,” Microbial Biotechnology, 2(2): 274-286, doi:10/1111/j.1751-7915.2009.00087.x, 2009.

Tartakovsky, A. M., D. M. Tartakovsky, T. D. Scheibe and P. Meakin, “Hybrid simulations of reaction-diffusion systems in porous media,” SIAM Journal on Scientific Computing, 30(6):2799-2816, 2008.

Tartakovsky, A., G. Redden, P. C. Lichtner, T. D. Scheibe, and P. Meakin (2008), Mixing-Induced Precipitation: Experimental Study And Multi-Scale Numerical Analysis, Water Resources Research, 44, W06S04, doi:10.1029/2006WR005725, 2008.

Scheibe, T., P. Meakin, P. Lichtner, and D. Zachmann, “Science for Problems under the Surface” SciDAC Review, Issue 7, pp. 32-41, Spring 2008.

Ginn, T. and T. Scheibe, “Special issue on discussions on metahydrogeology: Research stocktaking or identity crisis? Essays on the once and future merit of research in hydrogeology,” Journal of Hydrologic Engineering 13(1): 1-1, 2008.

Kamolpornwijit, W., S. C. Brooks, Y.-J. Kim, and T. D. Scheibe, “A Novel Approach to Estimate the Distribution of Reducible Iron Oxides Within Different Pore Domains of Structured Media,” Applied Geochemistry 22(12): 2630-2636, 2007.

Tartakovsky, A. M., P. Meakin, T. Scheibe, and B. D. Wood, “A smoothed particle hydrodynamics model for reactive transport and mineral precipitation in porous and fractured porous media,” Water Resources Research, 43(5): Art. No. W05437, doi:10.1029/2005WR004770, 2007.

Scheibe, T. D., H. Dong, and Y. Xie, “Correlation Between Bacterial Attachment Rate Coefficients and Hydraulic Conductivity and its Effect on Field-Scale Bacterial Transport,” Advances in Water Resources 30(6-7):1571-1582, 2007.

Tartakovsky A. M., P. Meakin, T. D. Scheibe, and R. M. Eichler West, "Simulations of reactive transport and precipitation with smoothed particle hydrodynamics." Journal of Computational Physics, 222(2):654-672, 2007.

Ginn, T. R., F. J. Loge, and T. D. Scheibe, "Explaining ‘Noise’ as Environmental Variations in Population Dynamics," Computing in Science and Engineering, 9(2): 40-49, 2007.

Scheibe, T. D., Y. Fang, C. J. Murray, E. E. Roden, J. Chen, Y.-J. Chien, S. C. Brooks, and S. S. Hubbard. “Transport and biogeochemical reaction of metals in a physically and chemically heterogeneous aquifer”, Geosphere 2(4): 220-235, 2006.

Dong, H., T. D. Scheibe, W. P. Johnson, C. M. Monkman, and M. E. Fuller, “Change of Collision Efficiency with Distance in Bacterial Transport Experiments,” Ground Water, 44(3): 415-429, 2006.

Roden E. E., and T. D. Scheibe. "Conceptual and numerical model of uranium(VI) reductive immobilization in structured subsurface sediments," Chemosphere 59(5): 617-628, 2005.

Hall, J. A., B. J. Mailloux, T. C. Onstott, T. D. Scheibe, M. E. Fuller, H. Dong, and M. F. DeFlaun, “Physical versus chemical effects on bacterial and bromide transport as determined from on site sediment column pulse experiments,” Journal of Contaminant Hydrology, 76(3-4): 295-314, 2005.

Ginn, T. R., T. A. Camesano, T. D. Scheibe, K. E. Nelson, T. P. Clement, and B.E. Wood, "Microbial Transport in the Subsurface" (invited review), in Encyclopedia of Hydrological Sciences, M. G. Anderson (Ed.), Wiley, N.Y., Chapter 105, pp. 1603-1626, 2005.

Li, X., T. D. Scheibe, and W. P. Johnson, “Apparent Decreases in Colloid Deposition Rate Coefficients with Distance of Transport under Unfavorable Deposition Conditions: A General Phenomenon,” Environmental Science and Technology, 38(21): 5616-5625, 2004.

Scheibe, T., “Interactive models for ground water flow and solute transport,” Ground Water, 42(1):8-11, 2004.

Scheibe, T. D. and B. D. Wood, 2003. “A particle-based model of size or anion exclusion with application to microbial transport in porous media,” Water Resources Research, 39(4), 1080, doi:10.1029/2001WR001223.

Scheibe, T. D. and Y.-J. Chien, 2003. “An evaluation of conditioning data for solute transport prediction,” Ground Water, 41(2): 128-141.

Ginn, T. R., B. D. Wood, K. E. Nelson, T. D. Scheibe, E. M. Murphy, and T. P. Clement, 2002. “Processes in microbial transport in the natural subsurface,” Advances in Water Resources, 25(8-12): 1017-1042.

Dong, H., T. C. Onstott, M. F. DeFlaun, M. E. Fuller, T. D. Scheibe, S. H. Streger, R. K. Rothmel, and B. J. Mailloux, 2002. "Relative dominance of physical versus chemical effects on the transport of adhesion-deficient bacteria in intact cores from South Oyster, Virginia", Environmental Science and Technology, 36(5): 891-900.

Scheibe, T. D. and M. C. Richmond, 2002. "Fish Individual-based Numerical Simulator (FINS): A particle-based model of juvenile salmonid outmigration and dissolved gas exposure history in the Columbia River Basin", Ecological Modelling, 147(3): 233-252.

Zhang, P., W. P. Johnson, T. D. Scheibe, K.-H. Choi, F. C. Dobbs, and B. J. Mailloux, "Extended tailing of bacteria following breakthrough at the Narrow Channel Focus Area, Oyster, Virginia," Water Resources Research, 37(11): 2687-2698, 2001

Balkwill, D., M. DeFlaun, F. Dobbs, J. Fredrickson, M. Fuller, M. Green, T. Ginn, T. Griffin, W. Holben, S. Hubbard, W. Johnson, P. Long, E. Majer, M. McInerney, T. Onstott, T. Phelps, T. Scheibe, D. Swift, D. White, and F. Wobber, "Breakthroughs in Field-Scale Bacterial Transport", EOS Trans. AGU, 82(38): 417,423-425, 2001.

Scheibe, T. D., Y.-J. Chien, and J. Radtke, " Use of quantitative models to design microbial transport experiments in a sandy aquifer", Ground Water, 39(2):210-222, 2001.

Johnson, W. P., P. Zhang, M. E. Fuller, T. D. Scheibe, B. J. Mailloux, T. C. Onstott, M. F. DeFlaun, S. S. Hubbard, J. Radtke, W. P. Kovacik, and W. Holben, "Ferrographic tracking of bacterial transport in the field at the Narrow Channel focus area, Oyster, VA", Environmental Science and Technology, 35(1):182-191, 2001.

Scheibe, T. D. and S. B. Yabusaki, "Scaling of flow and transport behavior in heterogeneous groundwater systems", Advances in Water Resources, 22(3):223-238, 1998.

Scheibe, T. D. and C. J. Murray, "Simulation of geologic patterns: A comparison of stochastic simulation techniques for groundwater transport modeling", in Sedimentology and Stratigraphy in Aquifer Heterogeneity, Fraser, G. S. and Davis, J. M.., eds., SEPM Concepts in Hydrogeology and Environmental Geology, No. 1, 1998.

DeFlaun M.F., C.J. Murray, W. Holben, T. Scheibe, A. Mills, T. Ginn, T. Griffin, E. Majer, and J.L. Wilson. 1997. "Preliminary observations on bacterial transport in a coastal plain aquifer", FEMS Microbiological Reviews, 20:473-487, 1997.

Scheibe, T. D. and D. L. Freyberg, "The use of sedimentological information for geometric simulation of natural porous media structure", Water Resources Research, 31(12):3259-3270, 1995.

Scheibe, T. D. and C. R. Cole, "Non-Gaussian particle tracking: Application to scaling of transport processes in heterogeneous porous media", Water Resources Research., 30(7):2027-2039, 1994.

Scheibe, T. D. and D. P. Lettenmaier, 1989. "Risk-based selection of monitoring wells for assessing agricultural chemical contamination of groundwater", Ground Water Monitoring Review, 9(4), 1989.

Conference Proceedings

Scheibe, T. D., A. M. Tartakovsky, D. M. Tartakovsky, G. D. Redden, P. Meakin, B. J. Palmer and K. L. Schuchardt, 2008. "Hybrid numerical methods for multiscale simulations of subsurface biogeochemical processes," Journal of Physics: Conference Series 125: 012054, doi:10.1088/1742-6596/125/1/012054.

Chase, J., K. Schuchardt, G. Chin, J. Daily, and T. Scheibe, 2008. “Iterative workflows for numerical simulations in subsurface sciences,” in IEEE Congress on Services – Part I, pp. 461-464, July 2008.

Meakin, P., A. Tartakovsky, T. Scheibe, D. Tartakovsky, G. Redden, P. E. Long, S. C. Brooks, and Z. Xu, 2007. “Particle methods for simulation of subsurface multiphase fluid flow and biogeological processes,” Journal of Physics: Conference Series 78:012047 doi:10.1088/1742-6596/78/1/012047

Scheibe, T. D., A. M. Tartakovsky, D. M. Tartakovsky, G. D. Redden, and P. Meakin, 2007. “Hybrid numerical methods for multiscale simulations of subsurface biogeochemical processes,” Journal of Physics: Conference Series 78: 012063 doi:10.1088/1742-6596/78/1/012063.

Tartakovsky, Alexandre M., Timothy D. Scheibe, and Paul Meakin, 2007. Smoothed particle hydrodynamics model for reactive transport and biomass growth, in Proceedings of the 2^nd International Conference on Porous Media and its Applications in Science and Engineering (ICMP2), Kauai, Hawaii, June 17-21, 2007.

Tartakovsky, A. M., P. Meakin, and T. D. Scheibe, 2007. " Reactive transport and biomass growth in porous media." In Proceedings of the second Smoothed Particle Hydrodynamics European Research Interest Community (SPHERIC) workshop, Crespo, A. J. C., M. Gomez-Gesteira, A. Souto-Iglesias, L. Delorme, and J. M. Grassa, Editors, p. 139-142, Madrid, Spain, May 23-25, 2007.

Fang, Yilin, Timothy Scheibe, Eric Roden, Wiwat Kamolpornwijit, and Scott Brooks, 2006. 3D field-scale reactive transport modeling of in situ immobilization of uranium in structured porous media via biostimulation, in Proceedings of the XVI International Conference on Computational Methods in Water Resources, edited by Philip J. Binning, Peter K. Engesgaard, Helge K. Dahle, George F. Pinder and William G. Gray. Copenhagen, Denmark, June, 2006. http://proceedings.cmwr-xvi.org/getFile.py/access?contribId=121&resId=1&materialId=paper&confId=a051

Hubbard, Susan, Jinsong Chen, Yilin Fang, Ken Williams, Sumit Mukhopadhyay, Eric Sonnenthal, Kim McFarlane, Niklas Linde, and Timothy Scheibe, 2006. Improved parameterization of hydrological models and reduction of geophysical monitoring data ambiguity through joint use of geophysical and numerical modeling methods, in Proceedings of the XVI International Conference on Computational Methods in Water Resources, edited by Philip J. Binning, Peter K. Engesgaard, Helge K. Dahle, George F. Pinder and William G. Gray. Copenhagen, Denmark, June, 2006. http://proceedings.cmwr-xvi.org/getFile.py/access?contribId=253&resId=0&materialId=paper&confId=a051

Tartakovsky, A., T. Scheibe, G. Redden, P. Meakin, and Y. Fang, 2006. Smoothed particle hydrodynamics model for reactive transport and mineral precipitation, in Proceedings of the XVI International Conference on Computational Methods in Water Resources, edited by Philip J. Binning, Peter K. Engesgaard, Helge K. Dahle, George F. Pinder and William G. Gray. Copenhagen, Denmark, June, 2006. http://proceedings.cmwr-xvi.org/getFile.py/access?contribId=119&sessionId=9&resId=0&materialId=paper&confId=a051

Engel, D. W., A. M. Liebetrau, K. D. Jarman, T. A. Ferryman, T. D. Scheibe, and B. T. Didier, “An iterative uncertainty assessment technique for environmental modeling,” In Proceedings, TIES 2004: The 15th Conference of the International Environmetrics Society, June 28-July 1, 2004, Portland, Maine.

Scheibe, T. D., D. W. Engel, A. M. Liebetrau, K. D. Jarman, T. A. Ferryman, and B. T. Didier, “Iterative response surface methods for quantifying uncertainty in environmental models,” (INVITED), online conference IDS-Water Americas 2004, published at http://www.idswater.com/waterus/IDSconference.asp , May 10-28, 2004.

Scheibe, T. D., C. J. Murray, Y. L. Xie, M. D. Williams, C. R. Cole, V. R. Vermeul, and M. P. Bergeron, “Temporal and spatial weighting of head and concentration observations for a large-scale transient inverse model,” in Proceedings of MODFLOW and More 2003: Understanding Through Modeling, Vol. 2, pp. 610-614, Golden, CO, September 16-19, 2003.

Scheibe T. D., M. C. Richmond, and L. E. Fidler. “Impacts of individual fish movement patterns on estimates of mortality due to dissolved gas supersaturation in the Columbia River Basin.” In proceedings of HydroVision 2002, HCI Publications, Kansas City, MO, 2002.

Savelieva E, Kanevski M, Timonin V, Pozdnukhov A, Murray C, Scheibe T, Xie Y, Thorne P, Cole C (2002) “Uncertainty in the hydrogeologic structure modeling” In the proceedings of IAMG’02, September 15–20, Berlin, Germany.

Scheibe, T. D., " The Value of Conditioning Data for Prediction of Conservative Solute Transport at the South Oyster Site, Virginia", in Proceedings "Bridging the Gap between Measurements and Modeling in Heterogeneous Media" International Groundwater Symposium organized by IAHR and co-sponsored by IAHS and ASCE/EWRI March 25-29, 2002 Berkeley, California.

Scheibe, T. D., " Correlation Between Heterogeneous Bacterial Attachment Rate Coefficients and Hydraulic Conductivity and Impacts on Field-Scale Bacterial Transport", in Proceedings of "Bridging the Gap between Measurements and Modeling in Heterogeneous Media" International Groundwater Symposium organized by IAHR and co-sponsored by IAHS and ASCE/EWRI March 25-29, 2002 Berkeley, California.

Scheibe, T. D., "The Value of Conditioning Data for Prediction of Conservative Solute Transport at the Oyster Site, Virginia", in Proceedings of Modflow 2001 and Other Modeling Odysseys, Golden, CO, Sept. 11-15, 2001.

Murray, C. J., T. D. Scheibe, F. J. Brockman, G. P. Streile, and A. Chilakapati, "Geostatistical characterization of microbiological and physical properties for bioremediation modeling", In Risk, Resource, and Regulatory Issues: Remediation of Chlorinated and Recalcitrant Compounds, G. B. Wickramanayake and R. E. Hinchee (eds.), Battelle Press, Columbus, Ohio, 79-84, 1999.

Scheibe, T. D. and D. L. Freyberg, "Impacts of geological structure on transport: Creating a data base", in Proceedings Fifth Canadian/American Conference on Hydrogeology, Stefan Bachu, Ed., National Water Well Association, pp. 56-71, 1990.

Technical Reports

Vermeul V. R., M. P. Bergeron, C. R. Cole, C. J. Murray, W. E. Nichols, T. D. Scheibe, P. D. Thorne, S. R. Waichler, and Y. Xie. 2003. Transient Inverse Calibration of the Site-Wide Groundwater Flow Model (ACM-2): FY03 Progress Report. PNNL-14398. Pacific Northwest National Laboratory, Richland, WA.

Scheibe, T. D. and M. C. Richmond. 2000. Fish Individual-based Numerical Simulator (FINS) Model. Report submitted to U.S. Army Corps of Engineers, Walla Walla District. Pacific Northwest National Laboratory, Richland, Washington.

Richmond, M.C., W.A. Perkins, and T.D. Scheibe. 1999. Two-Dimensional Hydrodynamic, Water Quality, and Fish Exposure Modeling of the Columbia and Snake Rivers. Part 1: Summary and Model Formulation. Final Report submitted to U.S. Army Corps of Engineers, Walla Walla District. Battelle Pacific Northwest Division, Richland, Washington.

Richmond, M.C., W.A. Perkins, and T.D. Scheibe. 1999. Two-Dimensional Hydrodynamic, Water Quality, and Fish Exposure Modeling of the Columbia and Snake Rivers. Part 2: McNary Reservoir. Final Report submitted to U.S. Army Corps of Engineers, Walla Walla District. Battelle Pacific Northwest Division, Richland, Washington.

Contributor to "Columbia River Salmon Mitigation Analysis System Configuration Study Phase I: Biological Plan -- Lower Snake River Drawdown", Prepared for the U.S. Army Corps of Engineers, Walla Walla District, February 1995.

Contributor to "Simulated Site Interactive Training Environment (SimSITE)", Detailed Requirements Analysis (EEI-5) and Software Design Document (EEI-8), Prepared for the U.S. Environmental Protection Agency, August and September, 1995.

Scheibe, T. D., C. R. Cole, and J. L. Devary, "Rokkasho Shallow-Land Low-Level Waste Disposal Study", Final Report prepared for Mitsubishi Materials Corporation, Tokyo, Japan, January, 1994.

Scheibe, T.D., D. P. Lettenmaier, S. J. Burges, and D. Pei, "Strategies for coping with drought, part 3: Planning and operation of hydro-thermal generation systems", Electric Power Research Institute, Report EPRI P-6465, March 1991.

Scheibe, T.D. and D.P. Lettenmaier, "Risk-based selection of monitoring wells for assessment of agricultural chemical contamination", University of Washington, Water Resources Series No. 101, April 1986.

Selected Abstracts and Presentations

Scheibe, T. D., “Quantifying flow and reactive transport in the heterogeneous subsurface environment: From pores to porous media and facies to aquifers,” Invited Keynote oral presentation given at the 2010 Computational Methods in Water Resources conference, Barcelona, Spain, June 2010.

Tartakovsky, A. M., D. M. Tartkovsky, T. D. Scheibe, and P. Meakin, “Hybrid diffusion-reaction models,” invited oral presentation by A. Tartakovsky at the SIAM Conference on Computational Science and Engineering, Miami, FL, March 3, 2009.

Scheibe TD, AM Tartakovsky, BJ Palmer, MC Richmond, BD Wood, I Battiato, and DM Tartakovsky. 2008. "Linking pore- and Darcy-scale models of reactive and non-reactive transport," Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract H13F-0993. (INVITED) Poster presented by T. Scheibe, December 2008.

Scheibe TD, R Mahadevan, Y Fang, S Garg, PE Long, and DR Lovley. 2008. "Integration of genome-scale metabolic models of iron-reducing bacteria with subsurface flow and geochemical reactive transport models," Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract B11B-0356. Poster presented by T. Scheibe, December 2008.

Scheibe T. D., 2008. "Opportunities and Challenges for High-Performance Computing in the Subsurface Sciences," Presented by T. Scheibe at SuperComputing 2008, Austin TX, November 18, 2008.

Garg, S., R. Mahadevan, T. Scheibe, Y. Fang, P. Long, and D. Lovley, "An integrated model of G. sulfurreducens for investigating bioremediation of U(VI) in subsurface sediments." Oral presentation given by R. Mahadevan at Computational Methods in Water Resources 17^th International Conference, San Francisco, CA, July 6-10, 2008.

Scheibe T. D., A. M. Tartakovsky, B. J. Palmer, M. C. Richmond, Y. Fang, and B. D. Wood. "Pore-scale modeling of reactive and non-reactive transport: Upscaling and multiscale hybrid modeling." Invited oral presentation given by T. Scheibe atComputational Methods in Water Resources 17^th International Conference, San Francisco, CA, July 6-10, 2008.

Fang, Y., T. D. Scheibe, and A. M. Tartakovsky, "Coupling finite elements and smoothed particle hydrodynamics methods for reactive transport." Poster presented by Y. Fang at Computational Methods in Water Resources 17^th International Conference, San Francisco, CA, July 7, 2008.

Scheibe, T. D., Y. Fang, A. M. Tartakovsky, and G. D. Redden. 2007. "Random-walk particle tracking for transport simulation: Extension to multi-component reactions.” Abstract submitted to American Geophysical Union 2007 Fall Meeting, San Francisco, CA. (PNNL-SA-56972)

Schuchardt, K. L., L. Sun, J. M. Chase, T. O. Elsethagen, V. L. Freedman, G. D. Redden, and T. D. Scheibe. 2007. “A Workflow Environment for Reactive Transport Modeling with Application to a Mixing-Controlled Precipitation Experiment.” Abstract submitted to American Geophysical Union 2007 Fall Meeting, San Francisco, CA. (PNNL-SA-57107)

Scheibe T. D. , A. M. Tartakovsky, Y. Fang, M. C. Richmond, C. L. Rakowski, B. D. Wood, D. M. Tartakovsky, I. Battiato, G. D. Redden, and B. J. Palmer. 2007. "Hybrid Pore- and Darcy Scale Models of Coupled Reactive Transport." Abstract submitted to American Geophysical Union 2007 Fall Meeting (Invited), San Francisco, CA. (PNNL-SA-56933)

Tartakovsky A. M., G. Redden, P. C. Lichtner, T. D. Scheibe, and P. Meakin, 2007. "Mixing-induced precipitation: Experimental study and multi-scale numerical analysis,” Abstract submitted to AGU 2007 Fall meeting, San Francisco, CA. (PNNL-SA-56781)

Ginn, T. R., T. D. Scheibe, H. Haeri, and C. N. McClain, 2007. “An expanded survey of groundwater modeling practitioners about how they quantify uncertainty: Which tools they use, why, and why not.” Invited oral presentation given by T. R. Ginn at the 2007 Geological Society of America Annual Meeting, Denver, CO, October 27-31, 2007. (PNNL-SA-57297)

Redden, G., Y. Fujita, Y. Fang, T. D. Scheibe, A. M. Tartakovsky, M. Beig, and R. W. Smith, 2007. “Controlling and predicting subsurface calcium carbonate precipitation for capture of inorganic contaminants,” oral presentation given by G. Redden at the 2007 Goldschmidt Conference, Cologne, Germany, August 19-24, 2007, abstract published in Geochimica et Cosmochimica Acta, 71(15):A824.

Scheibe, T. D., A. M. Tartakovsky, B. J. Palmer, K. L. Schuchardt,, D. M. Tartakovsky, G. D. Redden, P E. Long, and P. Meakin, 2007. “Hybrid numerical methods for multiscale simulations of subsurface biogeochemical processes,” poster presented by T. Scheibe at the SciDAC 2007 Conference, Boston, MA, June 25-28, 2007.

Scheibe, T. D., A. M. Tartakovsky, D. M. Tartakovsky, G. D. Redden, and P. Meakin, 2007. “Hybrid numerical methods for multiscale simulations of subsurface biogeochemical processes,” poster presented by T. Scheibe at the SciDAC 2007 Conference, Boston, MA, June 25-28, 2007.

Tartakovsky, A. M., T. D. Scheibe, D. M. Tartakovsky, and P. Meakin, 2007. "Hybrid pore-Darcy scale Lagrangian particle model for reactive transport and precipitation in porous media." Seminar presented May 28, 2007 by A. Tartakovsky at the Technical University of Catalonia, Barcelona, Barcelona, Spain.

Scheibe, T. D., A. M. Tartakovsky, D. M. Tartakovsky, G. D. Redden, and P. Meakin, 2007. “Hybrid numerical methods for multiscale simulations of subsurface biogeochemical processes,” EOS Trans. AGU, 88(23), Jt. Assem. Suppl., Abstract H31A-03. Poster presented by T. Scheibe at the 2007 AGU Joint Assembly, Acapulco, Mexico, May 21-25, 2007.

Scheibe, T. D., D. Tartakovsky, A. Tartakovsky, and G. Redden, “Hybrid Models for Multiscale Simulation of Subsurface Biogeochemical Processes,” oral presentation by T. Scheibe given at the SIAM Conference on Mathematical and Computational Issues in the Geosciences, Santa Fe, NM, March 19-22, 2007.

Ginn, T. R. and T. D. Scheibe, 2006. Report on an Informal Survey of Groundwater Modeling Practitioners About How They Quantify Uncertainty: Which Tools They Use, Why, and Why Not. EOS Trans. AGU, 87(52), Fall Meet. Suppl., Abstract H31F-01. Invited oral presentation given by T. Ginn at the Fall Meeting of the American Geophysical Union, Dec. 11-15, San Francisco, CA.

Scheibe, T. D., A. M. Tartakovsky, Y. Fang, and G. D. Redden, 2006. Models of Coupled Flow, Transport and Mineral Precipitation at a Mixing Interface in Intermediate Scale Experiments, EOS Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B53B-0347. Poster presentation given by T. Scheibe at the Fall Meeting of the American Geophysical Union, Dec. 11-15, San Francisco, CA.

Tartakovsky, A.M., T. D. Scheibe, P. Meakin, G. Redden, and Y. Fang, 2006. Multiscale Lagrangian Particle model for Reactive Transport and Mineral Precipitation in Porous Media. EOS Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B53B-0348. Poster presentation given by A. Tartakovsky at the Fall Meeting of the American Geophysical Union, Dec. 11-15, San Francisco, CA.

Hubbard, S., K. Williams, T. Scheibe, J. Peterson, J. Chen, S. Mukhopadhyay, E. Sonnenthal, and C. Steefel, 2006. Improved Understanding of Natural System Processes through Coupling of Geophysical Characterization and Numerical Modeling Approaches. EOS Trans. AGU, 87(52), Fall Meet. Suppl., Abstract H41G-01. Invited oral presentation given by S. Hubbard at the Fall Meeting of the American Geophysical Union, Dec. 11-15, San Francisco, CA.

Scheibe, T. D., Y. Fang, A. M. Tartakvovsky, and G. Redden, 2006. Hydrogeologic controls on subsurface biogeochemistry: Field-scale effects of heterogeneous coupled physical and biogeochemical processes. Geological Society of AmericaAbstracts with Programs, 38(7):110, presented at the Geological Society of America Annual Meeting, October 22-25, Philadelphia, PA.

Scheibe, T. D., A. M. Tartakovsky, G. Redden, P. Meakin, and Y. Fang, 2006. Pore-scale simulations of reactive transport with smoothed particle hydrodynamics. Presented by T. Scheibe at the SIAM (Society for Industrial and Applied Mathematics) Annual Meeting, Boston, MA, July 10-14.

Scheibe, T. D. 2006. Microbially mediated immobilization of uranium in a heterogenous aquifer: Field experiments and reactive transport simulations. Invited presentation given by T. Scheibe at University of California at Davis, Civil Engineering Seminar Series, Davis, CA, March 13, 2006.

Allen-King, R. M., G. S. Weissmann, C. J. Murray, B. N. Bjornstad, G. V. Last, and T. D. Scheibe. 2006. Geochemical and physical aquifer property heterogeneity: A multi-scale sedimentologic approach to reactive solute transport. Presented by G. Weismann at the Environmental Remediation Sciences Program workshop, Idaho Falls, ID, June 12, 2006.

Scheibe, T. D., S. C. Brooks, E. E. Roden, Y. Fang, and W. Kamolpornwijit. 2006. In situ bioremediation of uranium in a heterogeneous aquifer: Field-scale monitoring and numerical simulation. EOS Trans. AGU, 87(36), Joint Assembly Supplement, Abstract H42B-03.

Kamolpornwijit, W., S. C. Brooks, Y. Kim, and T. D. Scheibe. 2005. A novel approach to estimate the distribution of reducible iron within different pore fractions of structured media. Fall Meeting of the American Geophysical Union, December 2005, EOS Trans. AGU, 86(52), Fall Meeting Supplement, Abstract B42B-07.

Scheibe, T. D., D. W. Engel, and K. D. Jarman. An Adaptive Response Surface Modeling Method for Uncertainty Quantification with Application to a Transient Regional Groundwater Model, American Geophysical Union Fall Meeting, December 2005.Redden, G. D., Y. Fang, T. Scheibe, A. Tartakovsky, D. T. Fox, T. A. White, Y. Fujita, and M. E. Delwiche. 2005. Calcium carbonate precipitation along solution-solution interfaces in porous media. Fall Meeting of the American Geophysical Union, December 2005, EOS Trans. AGU, 86(52), Fall Meeting Supplement, Abstract B33C-1042.

Tartakovsky, A. M., P. Meakin, and T. D. Scheibe. 2005. Pore-scale smoothed particle hydrodynamics model for reactive transport and mineral precipitation. Fall Meeting of the American Geophysical Union, December 2005, EOS Trans. AGU, 86(52), Fall Meeting Supplement, Abstract H47A-07.

Tartakovsky, A. M., T. D. Scheibe, and P. Meakin. 2005. Pore-scale modeling of reactive transport and mineral precipitation in porous and fractured media. Geological Society of America Annual Meeting, October 2005, Abstracts with Programs, 37(7): 320.

Wang, Y., P. Zhang, and T. D. Scheibe. 2005. Non-exponential colloid distribution profiles as a result of radial flow field. Geological Society of America Annual Meeting, October 2005, Abstracts with Programs, 37(7): 533.

Fang, Y., T. D. Scheibe, E. E. Roden, and S. C. Brooks. 2005. Field-scale reactive transport simulations of multiple terminal electron accepting processes. Geological Society of America Annual Meeting, October 2005, Abstracts with Programs, 37(7): 535.

Scheibe T. D., Y. Fang, E. E. Roden, S. C. Brooks, and A. M. Tartakovsky. 2005. "Simulation of metal biogeochemistry in multiple-porosity groundwater flow systems." Presented by Timothy D. Scheibe (Invited Speaker) at Joint International Symposia for Subsurface Microbiology (ISSM 2005) and Environmental Biogeochemistry (ISEB XVII), Jackson, WY on August 15, 2005.

Tartakovsky A. M., P. Meakin, and T. D. Scheibe. 2005. "A smoothed particle hydrodynamics model for reactive transport in porous and fractured media." Presented by Alexandre M. Tartakovsky at The Joint International Symposia for Subsurface Microbiology (ISSM 2005) and Environmental Biogeochemistry (ISEB XVII), Jackson Hole, WY on August 15, 2005.

Roden, E., Mohanty, S., B. Kollah, T. Scheibe, Y. Fang, and S. Brooks. 2005. Numerical simulation of terminal electron-accepting processes in ethanol-stimulated subsurface sediments. American Society for Microbiology General Meeting, May 2005.

Scheibe, T. D., S. C. Brooks, W. Kamolpornwijit, Y. Fang, and E. E. Roden. 2005. Identification of physical and chemical mass transfer processes by a tracer flush experiment. 2005 AGU, SEG, NABS and SPD/AAS Joint Assembly. New Orleans, LA. May 23-27, EOS Trans AGU, 86(18), Jt. Assem. Suppl, Abstract H51A-02.

Kim, Y.-J., S. C. Brooks, W. Kamolpornwijit, T. D. Scheibe, and E. E. Roden. 2005. Immobilization of uranium(VI) in structured saprolite with microbial U(VI) reduction. 2005 AGU, SEG, NABS and SPD/AAS Joint Assembly. New Orleans, LA. May 23-27, EOS Trans AGU, 86(18), Jt. Assem. Suppl, Abstract H51A-06.

Kamolpornwijit, W., Y. J. Kim, S. C. Brooks, T. D. Scheibe, and M. A. Mayes. 2005. Estimation of groundwater flow distribution in structured media from non-reactive tracer results under unsaturated condition. 2005 AGU, SEG, NABS and SPD/AAS Joint Assembly. New Orleans, LA. May 23-27, EOS Trans AGU, 86(18), Jt. Assem. Suppl, Abstract H51A-05.

Scheibe, T. D., S. C. Brooks, and E. E. Roden, “Numerical simulation of field-scale transport and biogeochemical reactions using a particle-based method,” EOS Trans. AGU, 85(47), Fall Meet. Suppl., Abstract H21E-1068, 2004.

Spane, F. A., T. D. Scheibe, S. C. Brooks, and W. Kamolpornwijit, “Analysis of a micro-pumping test conducted within a saprolitic aquifer,” EOS Trans. AGU, 85(47), Fall Meet. Suppl., Abstract H21E-1066, 2004.

Scheibe, T. D., Y. Fang, E. E. Roden, S. C. Brooks, S. S. Hubbard, J. Chen, Y.-J. Chien, C. J. Murray and Y. Xie, “Transport and biogeochemical reaction of metals in a physically and chemically heterogeneous aquifer,” Geological Society of America Abstracts with Programs, 36(5):325, 2004.

Scheibe, T. D., D. W. Engel, and K. D. Jarman, “An adaptive response surface modeling method and application for uncertainty quantification,” oral presentation by T. Scheibe at the 2005 SIAM Conference on Computational Science and Engineering, Orlando, Florida, February 2005.

Scheibe, T. D., K. D. Jarman, D. W. Engel, A. M. Liebetrau, T. A. Ferryman, and B. T. Didier, “Response surface methods for uncertainty quantification with application to groundwater model predictions,” Presented by Tim Scheibe at AGU 2004 Western Pacific Geophysics Meeting, Honolulu, Hawaii, August 16-20, 2004.

Scheibe, Timothy D., Charles Cole, Marcel Bergeron, Vince Vermeul, Paul Thorne, Mark Williams, Christopher Murray, and Yulong Xie, “Quantifying uncertainty in Hanford Site groundwater model predictions” Oral presentation by Tim Scheibe at SIAM 2004 Annual Meeting, Portland, OR on July 15, 2004.

Jarman K.D., D.W. Engel, A.M. Liebetrau, T.A. Ferryman, and T.D. Scheibe. 2004. "Quantifying Uncertainty Using an Adaptive Response Modeling Approach." Oral presentation by Ken Jarman at SIAM 2004 Annual Meeting, Portland, OR on July 15, 2004.

Scheibe T. D., Y. Fang, E. E. Roden, S. C. Brooks, Y.-J. Chien, and C. J. Murray. "Microbial reduction of Fe(III) and U(VI) in aquifers: Simulations exploring coupled effects of heterogeneity and Fe(II) sorption." EOS Trans. AGU, 85(17), Jt. Assem. Suppl., Abstract H24A-05, 2004.

Kim, Y.-J., W. Kamolpornwijit, S. C. Brooks, T. D. Scheibe, and E. Roden, "Rate and extent of uranium(VI) sorption onto weathered saprolite", EOS Trans. AGU, 85(17), Jt. Assem. Suppl., Abstract H41E-03, 2004.

Vermeul V. R., M. P. Bergeron, C. R. Cole, W. E. Nichols, T. D. Scheibe, P. D. Thorne, S. R. Waichler, and M. D. Williams. 2003. "Three-Dimensional Transient Inverse Calibration of a Site-Wide Groundwater Flow Model Using a Facies-Based Approach at the Hanford Site, Southeast Washington ." Poster presented by Vince Vermeul at 2003 Geological Society of America National Meeting, Seattle, WA, November 5, 2003.

Scheibe, T. D., 2003. “Monte-Carlo Simulation of Bacterial Transport in a Heterogeneous Aquifer With Correlated Hydrologic and Reactive Properties.” Poster presented at 2003 American Geophysical Union Fall Meeting, San Francisco, CA, December 7, 2003.

Scheibe, T. D., W. E. Holben, W. P. Kovacik Jr., T. C. Onstott, and J. Hall, "Local-Scale Attachment Variability and Field-Scale Bacterial Transport in a Heterogeneous Aquifer", EOS Trans. AGU, 82(47), Fall Meeting Suppl., Abstract H41B-0295, 2001.

Shang, R., T. R. Ginn, and T. D. Scheibe, "Application of a Lagrangean Streamtube-Ensemble Modeling Approach to Reactive Transport Experiments in Natural Heterogeneous Porous Media", presented at the Annual Meeting of the AIChE, November 4-9, 2001, Reno, Nevada.

Zhang, P., W. P. Johnson, T. Scheibe, K.-H. Choi, and F. Dobbs, "Extended tailing of bacterial transport at the Narrow Channel Focus Area, Oyster, Virginia", EOS Trans. AGU, 81(48):F180, presented at the American Geophysical Union Fall Meeting, Dec. 15-19, 2000, San Francisco.

Wademan, M. C., T. R. Ginn, M. DeFlaun, and T. D. Scheibe, "Anomalous bacterial attachment-detachment in intact columns from the Oyster Site: Three hypotheses for the kinetics", EOS Trans. AGU, 81(48):F185, poster presented at the American Geophysical Union Fall Meeting, Dec. 15-19, 2000, San Francisco

Knudson, C. K., T. D. Scheibe, and P. L. Novak, "Use of the Web for Collaboration in Science and Technology: A Case Study", poster presented by Christa Knudson at the third Water Information Summit held by the WaterWeb Consortium in conjunction with the American Water Resources Association, Nov. 3-5, 2000, Miami, FL.

Scheibe, T. D. and B. J. Mailloux, "Field-scale bacterial transport in a heterogeneous aquifer", poster presented at the SEPM/IAS research conference on Hydrogeology of Sedimentary Aquifers, Santa Fe NM, September 24-27, 2000.

Scheibe, T. D., T. R. Ginn, M. E. Fuller, T. C. Onstott, and M. F. DeFlaun, "Modeling bacterial transport based on laboratory experiments using intact cores", presented at the 4^th International Symposium on Subsurface Microbiology, Vail CO, August 22-27, 1999.

Murray, C. J., G. P. Streile, F. J. Brockman, T. D. Scheibe, and A. Chilakapati, "Potential effects of the spatial distribution of bacteria on subsurface bioremediation", presented by C. J. Murray at the 4^th International Symposium on Subsurface Microbiology, Vail CO, August 22-27, 1999.

Scheibe, T. D., Y.-J. Chien, T. R. Ginn, C. J. Murray, and S. S. Hubbard, (invited) "Heterogeneity characterization for field-scale bacterial transport modeling", Abstract in EOS Transactions AGU Vol. 80, No. 17, page S115, presentation given at the American Geophysical Union Spring Meeting, Boston, June 1-4, 1999.

Muller, A. C., D. J. P. Swift, and T. D. Scheibe, "Stratal architecture in a prograding shoreface deposit, Eastern Shore, VA: Relationship to grain size, permeability, and facies distribution", Abstract in EOS Transactions AGU Vol. 80, No. 17, page S121, poster presented at the American Geophysical Union Spring Meeting, Boston, June 1-4, 1999.

Ginn, T. R., E. M. Murphy, T. D. Scheibe, T. C. Onstott, and M. DeFlaun, (invited) "Effects of chemical heterogeneity on subsurface fate and transport involving biotic reaction systems; Two examples", presentation given by T. R. Ginn, 1998 AGU Fall Meeting, San Francisco, California, December, 1998.

Scheibe, T.D. and C. J. Murray, (invited) " Hierarchical geostatistical simulation of multimodal heterogeneity for subsurface flow and transport", presentation given by T. D. Scheibe at the Geological Society of America Annual Meeting, Toronto, Canada, October 26-29, 1998.

Murray, C. J., T. D. Scheibe, F. J. Brockman, G. P. Streile, and A. Chilakapati, (invited) “Geostatistical characterization of microbiological and physical properties for bioremediation modeling”, presentation given by C.J. Murray, paper in proceedings of First International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California, May 18-21, 1998.

Scheibe, T. D. and D. L. Freyberg, "The use of sedimentological information for geometric simulation of natural porous media structure", (Invited) Abstracts with Programs, 25(6):A-108, Geological Society of America Annual Meeting, Boston, Massachusetts, October, 1993.

Scheibe, T. D. and D. L. Freyberg, "Impacts of sedimentary structure on subsurface flow and transport -- A geologically realistic example", (Invited) Abstracts with Programs, 25(6):A-38, Geological Society of America Annual Meeting, Boston, Massachusetts, October, 1993.