Hydraulic Parameter Generation Technique Using a Discrete Fracture Network with Bedrock Heterogeneity in Korea

Water

Se-Yeong Hamm¹  Doo-Hyun Lim²  Jae-Yeol Cheong³  Soo-Gin Kim³ 

[1] Department of Geological Sciences, Pusan National University, Busan 46241, Korea;FracMan Technology Group, Golder Associates Inc., Redmond, WA 98052, USA;Research & Development Institute, Korea Radioactive Waste Agency, Daejeon 34129, Korea;

关键词: discrete fracture network;    heterogeneity;    fracture distribution;    hydraulic parameter;    upscaling;   

DOI  :  10.3390/w9120937

来源: DOAJ

【 摘 要 】

In instances of damage to engineered barriers containing nuclear waste material, surrounding bedrock is a natural barrier that retards radionuclide movement by way of adsorption and delay due to groundwater flow through highly tortuous fractured rock pathways. At the Gyeongju nuclear waste disposal site, groundwater mainly flows through granitic and sedimentary rock fractures. Therefore, to understand the nuclide migration path, it is necessary to understand discrete fracture networks based on heterogeneous fracture orientations, densities, and size characteristics. In this study, detailed heterogeneous fracture distribution, including the density and orientation of the fractures, was considered for a region that has undergone long periods of change from various geological activities at and around the Gyeongju site. A site-scale discrete fracture network (DFN) model was constructed taking into account: (i) regional fracture heterogeneity constrained by a multiple linear regression analysis of fracture intensity on faults and electrical resistivity; and (ii) the connectivity of conductive fractures having fracture hydraulic parameters, using transient flow simulation. Geometric and hydraulic heterogeneity of the DFN was upscaled into equivalent porous media for flow and transport simulation for a large-scale model.

【 授权许可】

Unknown