HR: 1340h
AN: H23A-1119    [Abstracts]
TI: Investigation of Cross-Correlations between Fracture Frequencies and Results of the Vertical Flowmeter Test
AU: * Kim, T
EM: katzura@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AU: Shin, J
EM: jehyun@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AU: Hwang, S
EM: hwangse@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AU: Kim, K
EM: kykim@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AU: Chae, B
EM: bgchae@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AU: Kim, Y
EM: yjkim@kigam.re.kr
AF: KIGAM, 30, Gajeong-dong, Yuseong-gu, Daejeon, Department of Groundwater &Geothemal Resources Korean Institute of Geoscience and Mineral Resources(KIGAM), Daejeon, 305-350 Korea, Republic of
AB: In, general, it is one of the well-known phenomena in fractured media that there is no explicit correlation between fracture densities and bulk hydraulic conductivity. However, in most cases, the meaning of ›r­’fracture›r­_ does not have a unique sense in hydrogeology. ›r­’Fracture›r­_ simultaneously means as ›r­’bedding plane›r­_, ›r­’tectonic joint›r­_, ›r­’cooling joint›r­_, ›r­’weathering joint›r­_ and so on. All types of these ›r­’fractures›r­_ have different origins and different properties. In addition, there are a plenty of the conceptual models for fractured media with the hydrogeological sense; equivalent porous medium model, discrete model, dual porosity model, discrete percolation model, continuum percolation model, fractal model, linear programming methods and so forth. Which factors should be characterized is totally dependent on which conceptual model would be applied. The applied conceptual model is continuum percolation model in this study, and the purpose of this study is the investigation of cross-correlations between fracture frequency and the variation of vertical flow rate in borehole to check up how the REV of fractured medium can be determined in the field scale. We measured the relative vertical flow rates in two testing boreholes under the natural condition and the artificially stressed conditions, and collected the information of detectible fractures in the boreholes with a acoustic televiewer logging. And then we evaluated the change of vertical flow rates in surveyed boreholes and categorized the surveyed fractures based on their depths and orientations, and counted the frequency of fractures along with the borehole depth (1m interval) with various widths of surveyed windows, 1$\sim$10m. Using the results of frequency survey, cross-correlations between the changes of flow rate and the fracture frequency with various widths of windows were calculated. Results of this analysis show that 7m width of surveyed window has the highest cross-correlation. Even if more studies and investigations should be needed, 7m width can provide the important information to determine the REV of fractured medium in the tested site.
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting