Observations on Austrian clay rocks and their barrier functions for waste disposals — influence of the time factor : B. Schwaighofer, B. Knaak, F. Ottner & H. W. Muller, Applied Clay Science, 10(3), 1995, pp 199–208
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 172 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0148-9062
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✦ Synopsis
Rock column experiments were performed to examine the effects of matrix diffusion and hydrodynamic dispersion on the migration of radionuclides at the laboratory scale. Tritiated water and chloride transportation was studied in intact mica gneiss and in altered more porous tonalite columns with narrow flow channels. The column diffusion properties were estimated prior to water flow experiments using the gas diffusion method with helium as the tracer gas. The numerical compartment model for advection and dispersion, with and without matrix diffusion, was used to interpret the tracer transport in the columns. Matrix diffusion behavior was also distinguished from dominating hydrodynamic dispersion in rock column experiments at the slowest water flow rates. (Authors)