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The couplings among chemical reaction rates, advective and diffusive transport in fractured media or soils, and changes in hydraulic properties due to precipitation and dissolution within fractures and in rock matrix are important for both nuclear waste disposal and remediation of contaminated sites. This paper describes the development and application of(More)
and adminstrative review and has been approved for publication as an EPA document. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. All research projects making conclusions or recommendations based on environmentally related measurements and funded by the Environmental Protection Agency are required to(More)
It is forecasted that two out of three persons in the world will be water stressed by the year of 2025 (EPA 1998). Proper management of water resources at watershed scale may offer the best solutions for water shortage and contamination. The objective of the research is to conduct reactive flow simulations in surface-subsurface, coupled flow systems using a(More)
This paper presents the development and application of an integrated surface water and groundwater model to simulate hydrodynamics and temperature and salinity in tidal water bodies and subsurface media. The hydrodynamic module for tidal waters solves three-dimensional Navier-Stokes equations with or without the hydrostatic assumptions. The Richards(More)
New analytical model for cumulative infiltration into dual-permeability soils, Vadose Zone Journal, doi:10.2136/vzj2013, 15 pages (in press). Implementation and evaluation of permeability-porosity and tortuosity-porosity relationships linked to mineral dissolution-precipitation, Computational Geosciences, (in press). Water flow and nitrate transport through(More)
The first uranium production center in Brazil began operation in 1982. After 13 years of a non-continuous operation, the mining activities were suspended definitively. Uranium was extracted by open pit mining. Operations gave rise to approximately 12.4×10 6 m 3 of waste rock, while the mill process generated a volume of approximately 2.39×10 6 m 3 of(More)
This paper presents the development and application of a bay/estuary model to simulate hydrodynamics and salinity transport. The hydrodynamic module solves three-dimensional Navier-Stokes equations with or without the hydrostatic assumptions. The Boussinesq approximation is employed to deal with the buoyancy force due to temperature and salinity variations.(More)
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