Matthias Kohler Ramakrishnan Kannappan Martin A. Briggs Frederick D. Day-Lewis Gary P. Curtis 2015 <p><span>Scientifically defensible predictions of field scale U(VI) transport in groundwater requires an understanding of key processes at multiple scales. These scales range from smaller than the sediment grain scale (less than 10 μm) to as large as the field scale which can extend over several kilometers. The key processes that need to be considered include both geochemical reactions in solution and at sediment surfaces as well as physical transport processes including advection, dispersion, and pore-scale diffusion. The research summarized in this report includes both experimental and modeling results in batch, column and tracer tests. The objectives of this research were to: (1) quantify the rates of U(VI) desorption from sediments acquired from a uranium contaminated aquifer in batch experiments;(2) quantify rates of U(VI) desorption in column experiments with variable chemical conditions, and(3) quantify nonreactive tracer and U(VI) transport in field tests.</span></p> application/pdf en U.S. Department of Energy Upscaling of U (VI) desorption and transport from decimeter‐scale heterogeneity to plume‐scale modeling reports