| Project/Area Number |
17540409
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | University of Tsukuba |
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Principal Investigator |
TSUJIMURA Maki University of Tsukuba, Graduate School of Life and Environmental Sciences, Associate professor (10273301)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMADA Jun Kumamoto University, Faculty of Science, professor (80206169)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Rainfall-Runoff / Bedrock Groundwater / Dating of groundwater / Isotope Tracer |
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| Research Abstract |
The purpose of this research is to model the hydrological processes in a small catchment underlain by volcanic rock approached by multi-tracer technique using ^2H, ^<18>O, CFCs and inorganic constituents. Especially, the present study focused on establishment of analytical and modeling scheme to evaluate the age of groundwater and spring water using CFCs as a tracer.
The analytical system including a preparation line and gas chromatograph with ECD was established, and evaluation of analytical error was completed. The discharge in the springs and the groundwater level in the boreholes were monitored, and the spring water and the groundwater were sampled in January, July and November 2007. The intercomparison among piston flow model, dispersion model and exponential model was performed to discuss the age of spring and ground waters in the catchment.
The concentration of CFCs in the spring and ground waters showed a higher value in the upper stream region and a lower value in the mid -streamregion throughout the seasons. The piston and dispersion models produced good results of age in the upper stream region, and the exponential model showed the best performance for the dating in the mid-stream region. The ages of spring and ground waters ranged from 10 to 20 years in the upper stream region, 15 to 40 years in the mid-stream region, and 30 to 70 years in the coastal (down stream) region. The estimated groundwater flow system by these models agreed well with the spatial distribution of observed hydraulic head and solute concentration in the groundwater.
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