Latest Entries

  • December 25, 2009

Project overview: A geostatistical methodology for modelling groundwater flow and transport in low-permeability media – application on Boom Clay, Ieper Clay and Toarcian argillites

Fluid flow in permeable media has been extensively studied and analyzed in several contexts, especially in the development of groundwater resources and the recovery of petroleum. By comparison, less effort has been spent to groundwater flow and transport of pollutants in low-permeability media. Recently low-permeability layers receive more attention because their low hydraulic conductivities are [...]

  • December 25, 2009

Paper: Equivalent diffusion coefficient and equivalent diffusion accessible porosity

Abstract
Diffusion is an important transport process in low permeability media, which play an important role in contamination and remediation of natural environments. The calculation of equivalent diffusion parameters has however not been extensively explored. In this paper, expressions of the equivalent diffusion coefficient and the equivalent diffusion accessible porosity normal to the layering in a [...]

  • December 25, 2009

Paper: Stochastic analysis of the effect of spatial variability of diffusion parameters on radionuclide transport in a low permeability clay layer

Abstract
Most studies that incorporate subsurface heterogeneity in groundwater flow and transport models only analyze and simulate the spatial variability of hydraulic conductivity. Heterogeneity of the other flow and transport parameters is usually neglected. This approach is often justified, but there are, however, cases in which disregarding the heterogeneity of the other flow and transport parameters [...]

  • December 25, 2009

Paper: Review of the use of Péclet numbers to determine the relative importance of advection and diffusion in low permeability environments

Abstract
In low permeability environments, transport by advection is often neglected based on a Péclet number criterion. Such a criterion usually states that if the Péclet number (Pe) is much smaller than 1, diffusion dominates over advection and transport may be modeled considering diffusion only. Unfortunately, up to 10 different Péclet number definitions exist and for [...]

  • December 25, 2009

Paper: Hydrogeological modeling of radionuclide transport in low permeability media: a comparison between Boom Clay and Ypresian Clay

Abstract
Deep low-permeability clay layers are considered as suitable environments for disposal of high-level radioactive waste. In Belgium, the Boom Clay is the reference host formation and the Ypresian Clay an alternative host formation for research and safety and feasibility assessment of deep disposal of nuclear waste. In this study, two hydrogeological models are built to [...]

  • December 25, 2009

Paper: Stochastic analysis of the effect of heterogeneity and fractures on radionuclide transport in a low permeability clay layer

Abstract
Deep low-permeability clay layers are considered as safe environments for disposal of high-level radioactive waste. In Belgium, the Boom Clay is a candidate host rock for deep geological disposal. In this study, we analyze the effects of fractures and spatially variable hydraulic conductivity on radionuclide migration through the clay. Fracture geometry and properties are simulated [...]

  • December 25, 2009

Paper: Effect of excavation induced fractures on radionuclide migration through the Boom Clay (Belgium)

Abstract
In Belgium, the Boom Clay is being evaluated as a potential host formation for the disposal of high-level nuclear waste. In order to investigate this option, an underground research facility composed of two access shafts and 200mof galleries was excavated. Excavation induced fractures were observed in a zone of approximately 1 m around the galleries. [...]

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