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Found 69 results

2012
Lin X, Kennedy D, Peacock A, McKinley J, Resch CT, Fredrickson J, Konopka A.  2012.  Distribution of microbial biomass and potential for anaerobic respiration in Hanford Site 300 Area subsurface sediment. Applied and Environmental Microbiology. 78:759-767. Abstract
Peng S, Hu Q, Ewing RP, Liu C, Zachara JM.  2012.  Quantitative 3-D Elemental Mapping by LA-ICP-MS of a Basaltic Clast from the Hanford 300 Area, Washington, USA. Environmental Science & Technology. 46:2025-2032.
Johnson TC, Versteeg R, Ward A, Rockhold M, Slater LD, Zachara J.  2012.  Characterization of a contaminated wellfield using three-dimensional electrical resistivity tomography implemented with geostatistical, discontinuous boundary, and known conductivity constraints. Geophysics. :Submitted.
Murray C, Zachara J, McKinley JP, Ward A, Draper K, Moore D.  2012.  Establishing a geochemical model for a contaminated vadose zone – aquifer system. Journal of Contaminant Hydrology. :InPress.
Rockhold M, Chen X, Johnson T, Vermeul VR, Zachara J.  2012.  Geophysical data assimilation for facies delineation and application to inverse modeling of a field tracer test. Water Resources Research. :InPreparation.
Ma R, Zheng C, Liu C.  2012.  Groundwater impacts of radioactive wastes and associated environmental modeling assessment. Encyclopedia of Sustainability Science and Technology. :InPress.
Rockhold M, Vermeul VR, Mackley RD, Fritz B, Mendoza D, Newcomer E, Newcomer DR, Murray C, Zachara J.  2012.  Hydrogeologic characterization of the Hanford 300 Area Integrated Field Research Challenge Site and numerical modeling of the first aquifer tracer test. Ground Water. :Submitted.
Nowak W, Rubin Y, De Baros FPJ.  2012.  A hypothesis-driven approach to optimal site investigation. Water Resources Research. :InPress.
De Barros FPJ, Ezzedine S, Rubin Y.  2012.  Impact of hydrogeological data on measures of uncertainty, site characterization and environmental performance metrics. Advances in Water Resources. :InPress.
Ma R, Liu C, Greskowiak J, Prommer H, Zheng C, Zachara J.  2012.  Influence of calcite on uranyl reative transport in the grounwater-river mixing zone. Environmental Science & Technology. :Submitted.
Zachara J, Liu C, Oostrom M, McKinley JP, Wietsma T, Resch CT.  2012.  Mass transfer limited adsorption and desorption of U in intact sediment cores retrieved from a contaminated aquifer. Environmental Science & Technology. :InPreparation.
Ewing RP, Liu C, Hu Q.  2012.  Modeling intragranular diffusion in low-connectivity granular media. Water Resour. Res.. 48:W03518. Abstract
Johnson TC, Slater LD, Ward A, Ntarlagiannis D, Day-Lewis F, Elwasief M.  2012.  Monitoring groundwater-surface water interaction using time-series and time-frequency analysis of transient three-dimensional electrical resistivity changes. Water Resources Research. :Submitted.
Wallin E, Johnson TC, Greenwood WJ, Zachara J.  2012.  Monitoring high-stage river water intrusion along the Columbia River at the Hanford 300 Area using time-lapse electrical resistivity imaging. Water Resources Research. :Inpreparation.
Long P, Williams K, Freshley MD, Zachara J, Davis JA, Yabusaki S, Rockhold M.  2012.  Persistence of uranium groundwater plumes: Contrasting mechanisms at two contaminated DOE sites. Journal of Contaminant Hydrology. :InPreparation.
McKinley JP, Zachara J, Resch CT, Kaluzny RM, Miller MD, Vermeul VR, Fritz BG, Moser JV.  2012.  River water intrusion and contaminant uranium contributions to groundwater during the annual spring rise in Columbia River stage at the Hanford Site 300 Area, Washington. Environmental Science & Technology. :Submitted.
Liu C, Kerisit S, Shang J, Zachara J.  2012.  Scale dependent rates of uranyl desorption from contaminated sediments: Role of pore-scale reactive mass transfer. Environmental Science & Technology. :InPreparation.
Murakami H, Chen X, Rubin Y.  2012.  Sequential Bayesian geostatistical inversion and evaluation of combined data worth for aquifer characterization at the Hanford 300 Area. :InPreparation.
Stoliker DL, Liu C, Kent DB, Zachara JM.  2012.  Size dependence of desorption kinetics and equilibrium adsorption on uranium(VI)-contaminated sediments. Water Resources Research. :InPreparation.
Lin X, McKinley J, Resch CT, Kaluzny R, Lauber CL, Fredrickson J, Knight R, Konopka A.  2012.  Spatial and temporal dynamics of the microbial community in the Hanford unconfined aquifer. ISME J. :http://dx.doi.org/10.1038/ismej.2012.26.
Stegen JC, Lin X, Konopka AE, Fredrickson JK.  2012.  Stochastic and deterministic assembly processes in subsurface microbial communities. ISME J. :http://dx.doi.org/10.1038/ismej.2012.22.
Chen X, Murakami H, Hahn M, Hammond GE, Rockhold M, Rubin Y, Zachara J.  2012.  Three-dimensional Bayesian geostatistical aquifer characterization at the Hanford 300 Area using tracer test data. Water Resources Research. :Inpress.
Yin J, Haggerty R, Rockhold M, Kent DB.  2012.  U(VI) desorption in groundwater during water table fluctuations. Journal of Contaminant Hydrology. :InPreparation.
Fang Y, Zachara J, Liu C.  2012.  Uranium(VI) mass transfer under various injection conditions at Hanford Integrated Field Research challenge site.. Water Resources Research. :InPreparation.
Lichtner PC, Hammond GE.  2012.  Using high performance computing to understand roles of labile and nonlabile U(VI) on Hanford 300 Area plume longevity. Vadose Zone Journal. :Inpress.
Ma R, Zheng C, Zachara J, Tonkin M.  2012.  Utility of bromide and heat tracers for aquifer characterization in a highly dynamic environment. Water Resources Research. :InPress.
Lin X, Kennedy D, Fredrickson J, Bjornstad B, Konopka A.  2012.  Vertical stratification of subsurface microbial community composition across geological formations at the Hanford Site. Environmental Microbiology. 14:414-425.
2011
Hay MB, Stoliker DL, Davis JA, Zachara JM.  2011.  Characterization of the intragranular water regime within subsurface sediments: Pore volume, surface area, and mass transfer limitations. Water Resources Research. 47 Abstract
Spane FA, Mackley RD.  2011.  Removal of river-stage fluctuations from well response using multiple regression. Ground Water. 49:794-807. Abstract
Wang ZM, Zachara JM, Boily JF, Xia YX, Resch TC, Moore DA, Liu C.  2011.  Determining individual mineral contributions to U(VI) adsorption in a contaminated aquifer sediment: A fluorescence spectroscopy study. Geochimica et Cosmochimica Acta. 75:2965-2979. Abstract
Hammond GE, Lichtner PC, Rockhold ML.  2011.  Stochastic simulation of uranium migration at the Hanford 300 Area. Journal of Contaminant Hydrology. 120-21:115-128. Abstract
De Barros FPJ, Rubin Y.  2011.  Modelling of block-scale macrodispersion as a random function. Journal of Fluid Mechanics. 676:514-545. Abstract
Shang JY, Liu CX, Wang ZM, Zachara JM.  2011.  Effect of grain size on uranium(VI) surface complexation kinetics and adsorption additivity. Environmental Science & Technology. 45:6025-6031. Abstract
Liu CX, Shang JY, Zachara JM.  2011.  Multispecies diffusion models: A study of uranyl species diffusion. Water Resources Research. 47 Abstract
Greskowiak J, Hay MB, Prommer H, Liu CX, Post VEA, Ma R, Davis JA, Zheng CM, Zachara JM.  2011.  Simulating adsorption of U(VI) under transient groundwater flow and hydrochemistry: Physical versus chemical nonequilibrium model. Water Resources Research. 47 Abstract
Ma R, Zheng CM, Tonkin M, Zachara JM.  2011.  Importance of considering intraborehole flow in solute transport modeling under highly dynamic flow conditions. Journal of Contaminant Hydrology. 123:11-19. Abstract
Yin J, Haggerty R, Stoliker DL, Kent DB, Istok JD, Greskowiak J, Zachara JM.  2011.  Transient groundwater chemistry near a river: Effects on U(VI) transport in laboratory column experiments. Water Resources Research. 47 Abstract
Stoliker DL, Kent DB, Zachara JM.  2011.  Quantifying differences in the impact of variable chemistry on equilibrium uranium(VI) adsorption properties of aquifer sediments. Environmental Science & Technology. 45:8733-8740.
Zachara JM.  2011.  Hanford IFRC Quarterly Report, January 2011. Abstract
Vermeul VR, McKinley JP, Newcomer DR, Mackley RD, Zachara JM.  2011.  River-induced flow dynamics in long-screen wells and impact on aqueous samples. Ground Water. 49:515-524.
2010
Rubin Y, Chen XY, Murakami H, Hahn M.  2010.  A Bayesian approach for inverse modeling, data assimilation, and conditional simulation of spatial random fields. Water Resources Research. 46 Abstract
Greskowiak J, Prommer H, Liu C, Post VEA, Ma R, Zheng C, Zachara JM.  2010.  Comparison of parameter sensitivities between a laboratory and field-scale model of uranium transport in a dual domain, distributed rate reactive system. Water Resources Research. 46 Abstract
Hammond GE, Lichtner PC.  2010.  Field-scale model for the natural attenuation of uranium at the Hanford 300 Area using high-performance computing. Water Resources Research. 46 Abstract
Kerisit S, Liu CX.  2010.  Molecular simulation of the diffusion of uranyl carbonate species in aqueous solution. Geochimica et Cosmochimica Acta. 74:4937-4952. Abstract
Um W, Zachara JM, Liu CX, Moore DA, Rod KA.  2010.  Resupply mechanism to a contaminated aquifer: A laboratory study of U(VI) desorption from capillary fringe sediments. Geochimica et Cosmochimica Acta. 74:5155-5170. Abstract
Icenhower JP, Qafoku NP, Zachara JM, Martin WJ.  2010.  The biogeochemistry of technetium: a review of the behavior of an artificial element in the natural environment. American Journal of Science. 310:721-752. Abstract
Ilton ES, Zachara JM, Moore DA, McKinley JP, Eckberg AD, Cahill CL, Felmy AR.  2010.  Dissolution study of metatorbernite: Thermodynamic properties and the effect of pH and phosphate. Environmental Science & Technology. 44:7521-7526. Abstract
Ma R, Zheng CM.  2010.  Effects of density and viscosity in modeling heat as a groundwater tracer. Ground Water. 48:380-389. Abstract
Ma R, Zheng C, Prommer H, Greskowiak J, Liu C, Zachara J, Rockhold M.  2010.  A field-scale reactive transport model for U(VI) migration influenced by coupled multirate mass transfer and surface complexation reactions. Water Resources Research. 46 Abstract
Nowak W, De Barros FPJ, Rubin Y.  2010.  Bayesian geostatistical design: Task-driven optimal site investigation when the geostatistical model is uncertain. Water Resources Research. 46 Abstract
Ewing RP, Hu QH, Liu CX.  2010.  Scale dependence of intragranular porosity, tortuosity, and diffusivity. Water Resources Research. 46 Abstract
Johnson TC, Versteeg RJ, Ward A, Day-Lewis FD, Revil A.  2010.  Improved hydrogeophysical characterization and monitoring through parallel modeling and inversion of time-domain resistivity and induced-polarization data. Geophysics. 75:WA27-WA41. Abstract
Newcomer DR, Bjornstad BN, Vermeul VR.  2010.  Vertical wellbore flow monitoring for assessing spatial and temporal flow relationships with a dynamic river boundary. Ground Water Monitoring and Remediation. 30:123-135. Abstract
Murakami H, Chen X, Hahn MS, Liu Y, Rockhold ML, Vermeul VR, Zachara JM, Rubin Y.  2010.  Bayesian approach for three-dimensional aquifer characterization at the Hanford 300 Area. Hydrology and Earth System Sciences. 14:1989-2001. Abstract
2009
Liu CX, Shi ZQ, Zachara JM.  2009.  Kinetics of uranium(VI) desorption from contaminated sediments: Effect of geochemical conditions and model evaluation. Environmental Science & Technology. 43:6560-6566. Abstract
Bai J, Liu CX, Ball WP.  2009.  Study of Sorption-Retarded U(VI) Diffusion in Hanford Silt/Clay Material. Environmental Science & Technology. 43:7706-7711. Abstract
Stubbs JE, Veblen LA, Elbert DC, Zachara JM, Davis JA, Veblen DR.  2009.  Newly recognized hosts for uranium in the Hanford Site vadose zone. Geochimica et Cosmochimica Acta. 73:1563-1576. Abstract
De Barros FPJ, Rubin Y, Maxwell RM.  2009.  The concept of comparative information yield curves and its application to risk-based site characterization. Water Resources Research. 45 Abstract
Singer DM, Zachara JM, Brown GE.  2009.  Uranium speciation as a function of depth in contaminated Hanford sediments - A micro-XRF, micro-XRD, and micro- and bulk-XAFS study. Environmental Science & Technology. 43:630-636. Abstract
Mills RT, Hammond GE, Lichtner PC, Sripathi V, Mahinthakumar G, Smith BF.  2009.  Modeling subsurface reactive flows using leadership-class computing. Scidac 2009: Scientific Discovery through Advanced Computing. 180 Abstract
2008
Liu CX, Zachara JM, Qafoku NP, Wang ZM.  2008.  Scale-dependent desorption of uranium from contaminated subsurface sediments. Water Resources Research. 44 Abstract
Versteeg R, Johnson T.  2008.  Using time-lapse electrical geophysics to monitor subsurface processes. The Leading Edge. 27:1488-1497.
2007
McKinley JP, Zachara JM, Wan J, McCready DE, Heald SM.  2007.  Geochemical controls on contaminant uranium in vadose Hanford formation sediments at the 200 area and 300 area, Hanford Site, Washington. Vadose Zone Journal. 6:1004-1017. Abstract
Gee GW, Oostrom M, Freshley MD, Rockhold ML, Zachara JM.  2007.  Hanford site vadose zone studies: An overview. Vadose Zone Journal. 6:899-905. Abstract
Arai Y, Marcus MK, Tamura N, Davis JA, Zachara JM.  2007.  Spectroscopic evidence for uranium bearing precipitates in vadose zone sediments at the Hanford 300-area site. Environmental Science & Technology. 41:4633-4639. Abstract
Zachara JM, Serne RJ, Freshley MD, Mann FM, Anderson FJ, Wood MI, Jones TE, Myers DA.  2007.  Geochemical processes controlling migration of high level wastes in Hanford's Vadose Zone. Vadose Zone J. 6:985-1003.
Williams BA, Brown CF, Um W, Nimmons MJ, Peterson RE, Bjornstad BN, Lanigan DC, Serne RJ, Spane FA, Rockhold ML.  2007.  Limited field investigation report for uranium contamination in the 300 Area, 300 FF-5 Operable Unit, Hanford Site, Washington. :PNNL-16435.
Zachara JM, Brown CF, Christensen J, Davis JA, Dresel E, Liu C, Kelly S, McKinley JP, Serne RJ, Um W.  2007.  A site-wide perspective on uranium geochemistry at the Hanford Site. :PNNL-17031.
Bond DL, Davis JA, Zachara JM.  2007.  Uranium(VI) Release from Contaminated Vadose Zone Sediments: Estimation of Potential Contributions from Dissolution and Desorption. Adsorption of Metals to Geomedia II..