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Tetsu Tokunaga’s research combines soil physics with related fields of hydrogeology and biogeochemistry. His research accomplishments in the area of flow and transport include identifying a novel molecular free-path distribution model for gas diffusion in porous media, identifying scale limits for capillary hysteresis, the permeability-imbibition scaling relation, the importance of water film hydraulics in multiphase fluid flow, modeling and measurements of brine film thicknesses under confinement by supercritical CO2, experimentally identifying uncertainties associated with scaling predictions of capillary pressure-saturation relations for supercritical CO2-brine in porous media, showing that infiltration paths in talus rocks evolve towards a Boltzmann (geometric) distribution, measuring multiphase fluid equilibrium and flow in low permeability shales, and measuring solute diffusion through adsorbed water films. In field studies, he has expertise in monitoring subsurface flow and transport, particularly through developing novel methods for measuring hydraulic potentials in tandem with spatially resolved fluid sampling.
In the area of contaminant biogeochemistry, he has developed novel applications of the synchrotron X-ray microprobe for tracking transport and redox transformations of selenium, chromium, and uranium in sediments, identified the unsustainability of reduction-based remediation of uranium contamination, showed that unsaturated drainage of contaminated sediments can leach contaminants into groundwater for decades, and identified the role of uranyl vanadates in controlling uranium concentrations in some oxidizing environments.
In studies of terrestrial carbon, he tested the potential acceleration of soil carbon sequestration through gypsum dissolution, and quantified the contribution of deep unsaturated zone respiration to CO2 fluxes measured at the soil surface.
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N. J. Bouskill,M. Newcomer,R. W. H. Carroll, C. Beutler,M. Bill, W. S. Brown,M. Conrad, W. S. Dong,N. Falco,T. Maavara, A. Newman,P. O. Sorensen,
Journal of Geophysical Research: Biogeosciencesno. 3 (2024)
Gas Science and Engineeringpp.205366, (2024)
Gas Science and Engineering (2023): 204973-204973
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2023)
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Goldschmidt2022 abstracts (2022)
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Charuleka Varadharajan,Zarine Kakalia,Madison Burrus, Dylan O'Ryan, Erek Alper, Jillian F. Banfield, Max Berkelhammer,Curtis Beutler,Eoin L. Brodie,Wendy Brown, Mariah S. Carbone,Rosemary Carroll,
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2022)
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