| Project/Area Number |
14208064
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Kumamoto University |
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Principal Investigator |
SHIMADA Jun Kumamoto University, Faculty of Science, Professor, 理学部, 教授 (80206169)
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| Co-Investigator(Kenkyū-buntansha) |
TSUJIMURA Maki Univ.of Tsukuba, Inst.of Life and Env.Sci., Assist.Prof., 大学院生命環境科学研究科, 講師 (10273301)
HASE Yoshitaka Kumamoto University, Faculty of Science, Professor, 理学部, 教授 (40040109)
TOSAKA Hiroyuki Univ.of Tokyo, Grad.Sch.of Eng., Asso.Prof., 大学院・工学系研究科, 助教授 (90188748)
TOKUNAGA Tomochika Univ.of Tokyo, Grad.Sch.of Eng., Asso.Prof., 大学院・工学系研究科, 助教授 (70237072)
TANIGUCHI Makoto Kumamoto University, Res.Inst.of Humanity and Nature, Asso.Prof., 助教授 (80227222)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥59,930,000 (Direct Cost: ¥46,100,000、Indirect Cost: ¥13,830,000)
Fiscal Year 2005: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2004: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2003: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
Fiscal Year 2002: ¥23,010,000 (Direct Cost: ¥17,700,000、Indirect Cost: ¥5,310,000)
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| Keywords | bedrock groundwater aquifer / groundwater flow system / submarine groundwater discharge / groundwater flow simulation / bedrock borehole / hydrometric headwater observation |
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| Research Abstract |
Quaternary pyroclastic flow deposits are widely distributed in Japan, but their groundwater flow system has not been much studied. Relatively steep morphologic surface with humid temperate hydrological condition of our country should create active groundwater flow including coastal groundwater seepage-out. A 4.5 km^2 mountainous pyroclastic catchment has been selected in Uto peninsula, Kumamoto, Japan for this purpose and following four major themes has been taken to reveal the regional groundwater flow system :
1.Precise hydrometric study in the head water catchment,
2.isotope hydrological study with the help of groundwater potential measurement using deep observation boreholes,
3.Self potential and resistivity survey, seepage meter measurement in the on- and off-shore area,
4.Three dimensional groundwater flow simulation
The study was done from 2002 and 2005 with major hydrological observation system including 4 river discharge measurement and 8 different depths boreholes in the study catchment. The 3 dimensional groundwater flow system in the pyroclastic flow body has been cleared with the help of groundwater potential monitoring, SP measurement, environmental isotope study, and the simulation modeling. The SGD at the coastal area has shown the clear difference depend on the regional groundwater discharge estimated from water dudget calculation. Hydrometric observation at the headwater chatchment has shown the clear contribution of bedrock groundwater which also works as the recharge of the main groundwater body of the studied mountainous aquifer.
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