| Project/Area Number |
23510004
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MIYABARA Yuichi 信州大学, 山岳科学総合研究所, 准教授 (80311330)
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| Research Collaborator |
ASAI Kazuyoshi (株)地球科学研究所, 理学博士
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 年代解析 / 地下水 / 硝酸塩汚染 / 窒素安定同位体比 / 六フッ化イオウ / SF6 / 人工的不活性ガス / トリチウム |
|---|
| Research Abstract |
Groundwater age dating by using an inert gas (SF6) showed that the residence time of groundwater was 2 to 33 years in a village in southern Nagano. Nitrate concentration in wells of tap water sources and observation wells (intake depth >30m) showed maxima at around 20 years residence time (recharged in1993 to 1994) and a declining trend in less than 15 years residence time (recharged after 1997). The amount of fertilizer including manure was consistently decreasing during the last 40 years in the village, and the nitrate concentration of deep wells might reflect this decrease in nitrogen input.
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