| Project/Area Number |
17K19311
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Agricultural economics and rural sociology, Agricultural Engineering, and related fields
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| Research Institution | Saga University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中村 真也 琉球大学, 農学部, 教授 (30336359)
石川 洋平 有明工業高等専門学校, 創造工学科, 准教授 (50435476)
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| Project Period (FY) |
2017-06-30 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Keywords | 土壌水分 / COSMOS / 高速中性子 / モニタリング / 土壌雨量指数 / 土壌水分センサ網 / 宇宙線中性子 / 斜面崩壊 / 災害予知 |
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| Outline of Final Research Achievements |
Cosmic-ray soil moisture observing system (COSMOS), a method of measuring cosmic-ray neutrons (φ) near soil surface, was installed on a volcanic ash soil slope and examined to establish an innovative landslide warning system. Although the determination of near-surface soil moisture content (θ) based on φ-value was difficult due to the heterogeneity and uncertainty of water balance within sensing slope area, response of φ to soil water index (SWI) and/or θ was observed during the rainy season. We believe that the COSMOS presented here would be a unique method to monitor near surface soil moisture content of whole slope area if compatible soil moisture model considering the growth of plant communities and 3-dimentional topographic data are proposed.
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| Academic Significance and Societal Importance of the Research Achievements |
高速中性子数(φ)の測定に基づくCOSMOSを活用した新しい土砂災害警報システムを構築するために，火山灰土急斜面において，5地点×3深度の土壌水分量を連続測定し，それらのデータとCOSMOSによるφ値と経験的関係を見出した。COSMOSの実用化のためには，被覆植生や地形を考慮した校正に関する検討が必要であるものの，斜面の表層土壌水分量を連続測定できる唯一の方法として，COSMOSが有望であることを確認し，今後の土砂災害警報システム構築のための基礎的知見を得た。
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