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Report No.
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Study on flow and mass transport property evaluation method by optically measured data in a single fracture

Sato, Hisashi; Sawada, Atsushi 

A parallel plate fracture model is used for the safety assessment of radioactive waste disposal in crystalline rocks, such as granitic rocks. However, it is known that an effect of heterogeneously distributing fracture aperture onto the hydraulic property is different from the transport property used for the parallel plate model. Therefore, in order to investigate influences of heterogeneity of aperture distribution to the hydraulic and mass transport properties used for parallel plate model, aperture distribution and tracer concentration distribution data measured by optical method has been examined to understand the relationship between fracture transmissivity and transport aperture. The numerical simulation based on darcy flow shows 1.6 times larger flow rate than the data obtained from the hydraulic test. This result is one of precious evidence supported by quantitatively measured aperture data to demonstrate the inconsistency of the assumption of "local cubic law".

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