HR: 14:15h
AN: H43I-03    [Abstracts]
TI: Flow and Transport of Chemical Species in a 1-m Scale Fractured Granite Block
AU: * Hahn, P
EM: pshahn@kaeri.re.kr
AF: Korea Atomic Energy Research Institute, PO #105 Yuseong, Daejon, 305-600 Korea, Republic of
AB: Migration of chemical species has been studied in a single fracture of 1m scale in order to understand the transport behavior of contaminants at underground environments. The applied tracers were: tritium, anions as nonsorbing tracer and several cations and actinides as highly sorbing ones. Nine boreholes were drilled into the rock from the upper surface orthogonal to and ending at the fracture. The hydraulic conductivity in the fracture was determined from the pressure differential between pairs of boreholes. The hydraulic data were used with a variable aperture channel model to characterize the aperture distribution in the fracture. And a particle tacking method was used to simulate nuclides transport. The developed model was validated using the results obtained from the migration experiments. Results were plotted in the form of elution curves and migration plumes in the fracture. The elution curves have been explored with the transport model which takes into account diffusion into the rock matrix. The experimental study was focused on the identification of the retardation and matrix diffusion of the tracer in the fracture, thus providing a way to interpret the fracture field and the interactions between the rock and chemical species.
DE: 1800 HYDROLOGY
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting