HR: 08:00h
AN: H11I-01 INVITED    [Abstracts]
TI: Hydraulic Tomography in Fractured Granite: The Mizunami Underground Research Laboratory Site, Japan
AU: * Illman, W A
EM: walter-illman@uiowa.edu
AF: Dept of Earth & Environmental Sciences, University of Waterloo, 200 University Ave. West, Waterloo, ON N2L 3G1, Canada
AU: Liu, X
EM: xiaoyi-liu@uiowa.edu
AF: Department of Civil and Environmental Engineering, Stanford University, Terman Engineering Center M42 Stanford University, Stanford, CA 94305-4020, United States
AU: Yeh, T
EM: ybiem@mac.hwr.arizona.edu
AF: Department of Hydrology and Water Resources, The University of Arizona, John Harshbarger Building 1133 E. North Campus Drive, Tucson, AZ 85721, United States
AU: Ando, K
EM: ando.kenichi@obayashi.co.jp
AF: Obayashi Corporation, Technology Dept. No.4 Civil Engineering Technology Division Shinagawa Intercity Tower B 2-15-2 Konan, Minatoku, Tokyo, 108-8502, Japan
AU: Takeuchi, S
EM: takeuchi.shinji@jaea.go.jp
AF: Japan Atomic Energy Agency (JAEA), Tono Geoscientific Research Unit JAPAN ATOMIC ENERGY AGENCY 1-64, Yamanouchi, Akeyo, Mizunami-city, 509-6132, Japan
AU: Saegusa, H
EM: saegusa.hiromitsu@jaea.go.jp
AF: Japan Atomic Energy Agency (JAEA), Tono Geoscientific Research Unit JAPAN ATOMIC ENERGY AGENCY 1-64, Yamanouchi, Akeyo, Mizunami-city, 509-6132, Japan
AB: Two large-scale cross-hole pumping tests were conducted at separate locations in deep boreholes at the Mizunami Underground Research Laboratory (MIU) construction site in central Japan. We analyze the two cross- hole tests using the Transient Hydraulic Tomography (THT) code of Zhu and Yeh [2005] to compute the hydraulic conductivity (K) and specific storage (Ss) distributions, as well as their uncertainties in three-dimensions. The equivalent K and Ss obtained using asymptotic analysis served as the initial parameter estimates for the 3D stochastic inverse modeling effort. Results show several, distinct high K and low Ss zones that are continuous over hundreds of meters, which appear to delineate fault zones and its connectivities. The fault zones imaged through THT correlate well with available geological data and drawdown records. The THT analysis also identified a low K zone which corresponds with a known fault zone trending NNW and has been found to compartmentalize groundwater flow at the site. The results are evaluated through available geological information, drawdown records, arrival times of drawdown in response to pumping, velocities of drawdown pulses, and coseismic groundwater level responses during several large earthquakes.
DE: 1805 Computational hydrology
DE: 1828 Groundwater hydraulics
DE: 1846 Model calibration (3333)
DE: 1869 Stochastic hydrology
SC: Hydrology [H]
MN: 2007 Fall Meeting