ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
Journal of Nuclear Fuel Cycle and Waste Technology Vol.6 No.4 pp.265-282
중ㆍ저준위 방사성폐기물 처분 부지의 지하수 유동에 대한 수치 모사: 1. 지하수 유동 모델링
Numerical simulation of groundwater flow in LILW Repository site: I. Groundwater flow modeling
Based on the site characterization works in a low and intermediate level waste (LILW)repository site, the numerical simulations for groundwater flow were carried out in order tounderstand the groundwater flow system of repository site. To accomplish the groundwater flowmodeling in the repository site, the discrete fracture network (DFN) model was constructed usingthe characteristics of fracture zones and background fractures. At result, the total 10 differenthydraulic conductivity(K) fields were obtained from DFN model stochastically and K distributionsof constructed mesh were inputted into the 10 cases of groundwater flow simulations in FEFLOW.From the total 10 numerical simulation results, the simulated groundwater levels were stronglygoverned by topography and the groundwater fluxes were governed by locally existed highpermeable fracture zones in repository depth. Especially, the groundwater table was predicted tohave several tens meters below the groundwater table compared with the undisturbed conditionaround disposal silo after construction of underground facilities. After closure of disposal facilities,the groundwater level would be almost recovered within 1 year and have a tendency to keep asteady state of groundwater level in 2 year.