材料の不均質性を考慮した物質移行解析手法の開発

Abstract

Chemical transport of contaminant dissolved into underground water in heterogeneous media has received great amount of attention, especially in the study of safety assesment for a high level nuclear waste disposal site. In general, it is found difficult to obtain field-scale detailed three dimensional map of hydraulic conductivity and other key hydrologic parameters. Consequently, the spatial heterogeneity has to be modeled with stochastic parameters based on sparse spatial measurements. On the other hand, a major feature of transport in heterogeneous domain is found to be anomalous by the recent examination of field data. In the present study, we developed a analysis method, in which microscopic dispersion caused by sand particle is considered as well as macroscopic dispersion due to the material heterogeneity, by conbining Continuous Time Random Walk technique, stochastic finite element method, and stream line method.