Bryan J. Travis, Ph.D.
Senior Modeler

Expertise

BTravisMr. Travis has over 37 years of experience working in various areas of computational physics. His areas of experience include multiphase flow and transport in porous media, inverse problems, sensitivity analysis applied to transport in porous media, cellular automata models of porous flow, in situ bioremediation modeling, acid mine drainage, numerical modeling of hydrothermal circulation associated with mid‑ocean ridges, convection under permafrost, mantle thermal convection, multi-component gas and heat flow for landfills, natural and controlled source electromagnetic sensing of geologic structures, rad/hydro with optical signatures, neural networks and computational neurobiology. Mr. Travis is Author/co‑author of more than 100 refereed papers and technical reports.

 

Education

-Ph.D. (Applied Mathematics) Florida State University, 1974
-M.S. equiv. (Medical Science) University of New Mexico, 1978-1984
-B.A. (Mathematics) University of Alabama, 1968

Relevant Experience Includes:

• Numerical modeling of saturated/unsaturated transport of PCE a site in Phoenix, Arizona. Three dimensional numerical simulations were conducted to predict the transport of PCE through the vadose zone and into the groundwater, and to evaluate the efficiency of potential treatment via AS and SVE.

• Numerical simulations in support of an experimental landfill site, under both aerobic and anaerobic operating conditions. The goal of this two-dimensional and three-dimensional modeling effort is to provide the ability to use gas composition data to control temperature in a landfill by optimizing the flow of air and moisture.

• Numerical simulations to evaluate design of biosparging and bioventing systems for cleanup of soils and groundwater impacted by liquid phase petroleum hydrocarbons an airport site in Phoenix, Arizona. Work has included use of numerical models to interpret field and preliminary pilot test data, and to evaluate a design for a full-scale site bioventing system, and to evaluate a design for a large scale biosparging test system for the site. The design is being evaluated in terms of projected air circulation and accompanying oxygen delivery and microbial activity.

• Development of a three-dimensional numerical simulator for multi-component, two-phase, non-isothermal, chemically or biologically reactive flow and transport in porous media, coupled to optimization software. Resulted in an improved, much faster version of TRACR3D (which he also developed), intended for a wide range of hydrological and environmental applications.

Numerical modeling for a petroleum fuel spill at a site in California. Three dimensional numerical simulations were conducted to compare predicted movement of the fuel oil through the unsaturated zone to the water table, against field measurements, and to design an in situ bioremediation system.

Development of a multi-species in situ bioremediation model to evaluate co-metabolic degradation of TCE in the unsaturated zone as well as below the water table, at the Savannah River site.

Work associations prior to HGC have included the Earth and Environmental Sciences Division at Los Alamos National Laboratory, as well as Boeing Aerospace Co.

Consultant to Union Oil of California.

Consultant to Hydro Geo Chem, before joining the HGC staff.

PROFESSIONAL PUBLICATIONS:

Knutson, C. E., C. J. Werth, A. J. Valocchi, & B. J. Travis, 2004. Modeling of biofilm morphology along a transverse mixing zone in porous media at the pore scale, Comp.Methods Water Resources 15, 61-69.

Travis, B. J., & G. Schubert. Hydrothermal convection in carbonaceous chondrite parenT bodies, submitted to Earth & Planetary Science Letters.

Hier Majumder, C. A., B. J. Travis, E. Belanger, G. Richard, A. P. Vincent, & D. A. Yuen. Efficient Adjoint Sensitivity Analysis for Flow and Transport in the Earth's Crust and Mantle, submitted to Geophysical Journal Intrntl.

Bunge, H-P, C. R. Hagelberg, and B. J. Travis, 2003. "Mantle circulation models with variational data assimilation: inferring past mantle flow and structure from plate motion histories and seismic tomography", Geophys.J.Intl., 152, 280-301.

Dutrow, B. L., B. J. Travis, C. W. Gable, and D. J. Henry, 2001. "Coupled heat and silica transport associated with dike intrusion into sedimentary rock: Effects on isograd location and permeability evolution", J. Geochim et Cosmochim. Acta: 65(21) 3749-3767.

Weeber, P. A., P. F. Andersen, B. J. Travis, D. C. Noffsinger, 2001. "Modeling Biosparging and Natural Attenuation of Chlorinated Ethenes at SRS", in Bioremediation and Phyto-remediation of Chlorinated and Recalcitrant Compounds, Proc., Monterey, CA, May 22-25.

Travis, B. J., 2000. "Using Fractal Functions to Capture Subgridscale Dynamics in Porous Flow and Transport Numerical Models", Computational Methods in Water Resources 13: 849-854.

Abdelouas, A., W. Lutze, W. Gong, E.H. Nuttall, B.A. Strietelmeier, B.J. Travis, 2000. Biological reduction of uranium in groundwater and subsurface soil. The Science of the Total Environment 250, 21-35.

Travis, B. J., 1999. "A Modeling Study of Possible Nonlinear Interactions Between Microbes and Protozoa in the Subsurface", Eos Trans. AGU 80(46): Fall Meet. Suppl., Abs B52A-06.

Travis, B.J., 1998."Numerical Simulation of In Situ Bioremediation", pp. 91-98, in Computational Methods in Water Resources XII: Computational Methods in Contamination and Remediation of Water Resources, V.N. Burganos, G.P. Karatzas, A.C. Payatakes, C.A. Brebbia, W.G. Gray, and G.F. Pinder, eds., Computational Mechanics Publications, Southampton, UK.

Vanderberg-Twary, L., K. Steenhoudt, B. Travis, J. L. Hanners, T. M. Foreman, and J. R. Brainard, 1997. "Biodegradation of paint stripper solvents in a modified gas lift op bioreactor", Biotechnology and Bioengineering J., 55(1), 163-169.

Travis, B.J., and N.D. Rosenberg, 1997. "Modeling In Situ Bioremediation of TCE at Savannah River: Effects of Product Toxicity and Microbial Interactions on TCE Degradation", Environ. Sci. & Tech, 31(11), 3093-3102.

Bridwell, R. J., and B. J. Travis, 1995. "Numerical Simulation of Acid Mine Drainage (AMD) in a Fully-Coupled 3-D Ground Water Flow and Chemical Transport Model:Part I, Field Example and Validation", Proceedings, Conf. on Mining and the Environment, Sudbury, Ontario, Canada, May 28-June 1, 1995.

Birdsell, K.H., K. G. Eggert, and B.J. Travis, 1994. "Three Dimensional Simulations of Radionuclide Transport at Yucca Mountain", Radioactive Waste Management and Environmental Restoration, 19, 1-28.

Travis, B.J., K. Eggert, D. Grunau, S.Y. Chen, and G. Doolen 1993. "Lattice Boltzmann Models for Flow in Porous Media", pp. 42-47, in Computing at the Leading Edge:Research in the Energy Sciences, eds. A. A. Mirin, and P. T. Van Dyke, National Energy Research Supercomputer Center, Lawrence Livermore National Laboratory Report UCRL-TB-111084.

Keller, C., and B. Travis, 1993. "Evaluation of the Potential Utility of Fluid Absorber Mapping of Contaminants". Proceedings, NGWA Outdoor Action Conference, Las Vegas, NV.

Unsworth, M. J., B. J. Travis, and A. D. Chave, 1993. "Electromagnetic induction by a finite electric dipole source over a 2-D Earth", Geophysics J., v. 58, No. 2, 198-214.

Chemburkar, R. M., L. F. Brown, B. J. Travis, and B. A. Robinson, 1991. "Numerical Determination of Temperature Profiles in Flowing Systems from Conversions of Chemically Reacting Tracers", Chem. Engr. Sci., 46, 1349-1360.

Travis, B. J., and K. H. Birdsell, 1991. "TRACRN 1.0: A Model of Flow and Transport in Porous Media for the Yucca Mountain Project --Model Description and User's Manual," Los Alamos National Laboratory Report LA-11798-M, April, 1991.

Chen, S., K. Diemer, G. D. Doolen, K. Eggert, C. Fu, S. Gutman, B. Travis, 1991. "Lattice Gas Automata for Flow Through Porous Media", Physica D, 47,72-84.

Birdsell, K. H., P. G. Springer, L.F.Brown, G. A.Cederberg, B. J. Travis, and A. E. Norris, 1988. "Modeling Tracer Diffusion in Fractured and Unfractured, Unsaturated, Porous Media", J. Contaminant Hydrology, 3, 145-170.

Travis, B. J., and H. E. Nuttall, 1987. "Analysis of Colloid Transport, " in Coupled Processes Associated with Nuclear Waste Repositories, C. F. Tsang, Ed., Academic Press, 1987.

Travis, B. J., and H. E. Nuttall, 1987. "Two-Dimensional Numerical Simulation of Geochemical Transport in Yucca Mountain", Los Alamos Report LA-10532-MS, 68 pages, Dec., 1987.

Cederberg, G. A., L. E. Greenwade, and B. J. Travis, 1987. "The Transport of Uranium and Technetium Through the Unsaturated Tuffs, Yucca Mountain, Nevada," Materials Research Society, 84, 703-712.

Travis, B. J., and H. E. Nuttall, 1985. "A Transport Code for Radiocolloid Migration With an Assessment of a Low-Level Waste Site," in Proceedings of the MRS Symposium on Scientific Basis for Nuclear Waste Management, Vol. 44, p.969-976.

Perkins, B., G. L. DePoorter, and B. J. Travis, 1985. "Soil Water Flow Under Saturated/Unsaturated Conditions --- Validation of the TRACR3D Code in Three Experiments," Los Alamos National Laboratory Report LA-10263-MS, January, 1985.

Travis, B. J., A. H. Davis, T. D. Kunkle, R. G. Deupree, 1985. "KRAK -- A Computer Program for Two-Phase, Two Component Porous Flow and Fracture Propagation," Los Alamos National Lab. Report LA-9703 (Rev.) April, 1985.

Travis, B. J., and L. E. Greenwade, 1985. "A One-Dimensional Numerical Model of Two-Phase Flow and Transport in Porous Media Using the Dynamics of Contours Methodology," Los Alamos National Laboratory Report LA-UR-85-3328.

Travis, B. J., S. W. Hodson, H. E. Nuttall, T. L. Cook, and R. S. Rundberg, 1984. "Preliminary Estimates of Water Flow and Radionuclide Transport in Yucca Mountain," Los Alamos National Laboratory Report LA-UR-84-40 (Rev.).

Travis, B. J., 1984. "TRACR3D: A Model of Flow and Transport in Porous/Fractured Media", Los Alamos National Laboratory Report LA-9667-MS, 110 pp., May, 1984.

Travis, B. J., P. J. Hommert and C. E. Tyner, 1983. "A Two Dimensional Numerical Model of Underground Oil Shale Retorting", Proc., ASME-JSME Thermal Engineering Conf., 2, 43-54.

Travis, B. J., 1983. "Comparison of the KRAK Model With Experimental Data," in Proceedings of the 2nd Symposium on Containment of Underground Nuclear Explosions , Vol. 2, p.231-252.

Travis, B. J., A. H. Davis, 1980. "Calculation of Gas-Driven Fracture Propagation in Rocks", Proc., 21st U. S. Symp. on Rock Mechanics, Rolla, Mo., pp. 356-361.


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