| Project/Area Number |
17K01232
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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 |
Geography
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| Research Institution | Teikyo Heisei University |
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Principal Investigator |
SATO GO 帝京平成大学, 現代ライフ学部, 教授 (00468406)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 崩壊 / 斜面変動 / 火山灰 / クロボク土 / 孔内傾斜計 / 表層崩壊 / 加速度孔内傾斜計 / 降下火山灰 / クリープ / 土質試験 / 阿蘇カルデラ / 観測 / MEMS孔内傾斜計 / レス / 堆積相 / 土砂災害 |
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| Outline of Final Research Achievements |
This study attempted to explain the shallow landslide mechanisms of volcanic-ash covered slopes by topographical and geological surveys, as well as soil tests at Aso Caldera. Topographic and geological survey revealed an outcrop consisting of deformed layers of tephra and Kuroboku soils. The deformation was generated by the flow of the Kuroboku soil layer. The result of soil tests proved that the flow layer's strength was lower than that of the non-flowing layers. Although the observation of the gravitational movement of slope sediments using a MEMS-installed strain-gauge did not show any deformation leading to the flow, the author succeeded in capturing minute movements on a millimeter scale. Observation will continue to verify the relationship between rainfall and slope movement.
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| Academic Significance and Societal Importance of the Research Achievements |
局地的な豪雨を誘因とした山地斜面の崩壊とそれに伴う土砂災害は我が国の深刻な問題である。本研究では豪雨によって引き起こされた崩壊によって多くの被害が生じてきた阿蘇地域を調査地に設定し，崩壊の発生プロセスを明らかにすることを地形・地質・土質調査をもとに実施した。現地では斜面の変動をとらえるべく観測装置も設置した。今後も引き続き観測を続けることで降雨量と崩壊発生の関係等が明らかになることも期待される。
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