한국지하수토양환경학회 춘계학술발표회 2013년 4월 11일-12일 한화리조트 제주
Effect of nonlinear groundwater flow on a slug test
지성훈1*․고용권1
1한국원자력연구원, 방사성폐기물처분연구부
*e-mail : [email protected]
Abstract / 요 약 문
Because the fracture has high permeability and small storage capacity contrary to the matrix, groundwater in a fractured rock tends to flow through fracture rather than rock matrix, and groundwater flow in a fractured rock can be characterized by heterogeneity and discontinuity. This characteristic of groundwater flow in a fractured rock introduces uncertainty in characterization, conceptualization and simulation of a groundwater flow in fractured rocks. Korea Atomic Energy Research Institute Underground Research Tunnel (KURT) is located in granite, a fractured crystalline rock, and numerous hydraulic tests have been conducted at the installed boreholes in KURT. At the TB-5 borehole in KURT, which is a vertical borehole with 30 m length, a series of slug tests were conducted at several pack-off sections. The results show that the estimated transmissivities from the slug tests decreased as the initial displacement increased. The analysis of the test results indicates that the nonlinear groundwater flow was arisen when large initial displacements were implied for the slug tests and it made the transmissivity be underestimated, which suggests that it is recommended to conduct a slug test with a small initial displacement to estimate the hydraulic parameters close to truly representative values.
key words : fractured rock aquifer, slug test, nonlinear flow.
