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Showing 1 to 12 of 12 for “"Reactive transport modeling"”.
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Flow and reactive transport modeling at the stream-groundwater interface
… For this purpose, a three-dimensional numerical modeling approach for coupling stream water flow with porous media flow is used. Multiple steady state stream water flow scenarios over different generic pool-riffle morphologies and a natural in-stream gravel bar are simulated by a computational …
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Quantifying the impacts of exogenous dust inputs to watersheds using reactive transport modeling
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Analytical Modeling of Bentonite Swelling and Numerical Reactive Transport Modeling in Nuclear Waste Disposal Systems
… and high plasticity, which can restrict the transport of nuclear waste through the barrier and maintain the sealing ability of barrier even with the deformation of bentonite, respectively. Montmorillonite is considered as the primary constituent of bentonite, which is a major expandable …
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The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, Nevada
… computationally intensive. We have developed two reactive transport modeling techniques to simulate radionuclide transport at Yucca Mountain: (1) the selective coupling approach applied to the convection-dispersion-reaction (CDR) model and (2) a reactive streamtube approach (RST). These models …
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Physical and Deep-Learning-Based Explorations of Microbe-Mediated Reactive Transport Processes in Porous Media Across Scales
Reactive transport (RT) simulators are important tools often used by researchers to gain insights into subsurface processes. These multi-physics simulations attempt to represent many hydro-biogeochemical phenomena, but they often fall short in terms of computational speed and physical accuracy. …
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Geochemical modeling of diagenesis, hydrothermal alteration, and unconformity-related uranium mineralization in the Athabasca Basin, Saskatchewan, Canada
… mechanisms responsible for metal leaching and transport, and deposition mechanisms of ores. This study uses geochemical modeling to: 1) determine fluid flow patterns responsible for U leaching and transport in the Athabasca basin; 2) recognize critical factors controlling ore deposition near …
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Uranium isotopes as indicators of uranium immobilization and remobilization in contaminated aquifer settings
… alone is challenging, as groundwater transport, aquifer heterogeneity, and U(VI) adsorption can complicate data interpretation. U isotopes (238U/235U) provide a more direct indicator of these geochemical reactions controlling U mobility. U(VI) reduction induces a strong fractionation …
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Linkages between fluid flow paths, reactive gases, and chemical weathering across a shale bedrock hillslope
… in combination with laboratory experiments and reactive transport modeling. The VMS allows for the direct observation of chemical and gas signatures in the vadose zone for the comparison of chemical evolution of fluids in lab experimental setting. We sampled water and gases across 18 meters of …
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Modeling biotic and abiotic decay of trichloroethylene (TCE) using the Reactive Multi-Species Transport in 3-Dimensional Groundwater Aquifers (RT3D) code
… can spend long time periods in LPZs as the mass transport is mainly by diffusion. The biotic process uses an organic solute such as lactate as an electron donor and the halogenated compounds as electron acceptors to biologically transform TCE into dichloroethylene (DCE), vinyl chloride (VC), and …
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Microbial and Chemical Zonation and Mineral Weathering in the Middendorf Aquifer, South Carolina
… Using the chemical data obtained, I constructed reactive transport modeling to better understand the kinetics of chemical weathering in the Cretaceous Middendorf aquifer of South Carolina, USA, and the relationship of this process to subsurface microbial activity. The model accounts for the …
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Stable isotope and trace element fractionation and implications for chemical weathering rates
The student, Nicole Fernandez-Franzan, accepted the attached license on 2020-05-05 at 04:05.
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A modeling framework for characterizing root exudation-driven geochemical dynamics in the Critical Zone
… practices have induced significant shifts in the transport and transformation of water, carbon, and nutrients across landscapes. The long-term implications of such changes on soil health and water chemistry remain an open challenge, and the mechanisms that drive changes in solute chemistry and …