| Project/Area Number |
17310019
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental impact assessment/Environmental policy
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| Research Institution | University of Tsukuba |
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Principal Investigator |
ONDA Yuichi University of Tsukuba, Graduate School of Life and Environmental Sciences, Associate Professor (00221862)
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| Co-Investigator(Kenkyū-buntansha) |
JITOUZONO Takashi Kagoshima University, Faculty of Agrioulture, Associate Prof. (50145455)
SASAHARA Katsuo Kouchi University, Faculty of Agruautltiue, Professor (90391622)
UCHIDA Tarou Public Works Reserch Ins, Erosion and Sediment Control Research Group, Senior Researcher (60370780)
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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 |
¥16,880,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2007: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2006: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2005: ¥9,900,000 (Direct Cost: ¥9,900,000)
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| Keywords | Disaster prevention / Flood / Mitigation / Disaster |
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| Research Abstract |
To examine the effects of air pressure under the grand for the landslide, field observation in Kyushu island and a large-size sprinkling experiment were conducted. At tableland, which is composed of Shirasu, in Kyushu, nearly always air pressure in a well was similar to atmospheric pressure and air did not get out from the well. However air pressure was bigger than atmospheric pressure while atmospheric pressure was falling. At the same event, an air flow was observed from another well called s 3. There was a time lag between these phenomena. The s 1 may different from s 3 in water systems, so it might different too in "air system". In the experiment, we pumped air to under a sand slope. Air pressures in the slope were not different so much even though we pumped high pressured air or low pressured air. However, when we pumped high pressured air, water daters changed clearly, for instance, discharge, pressure head, and hydraulic gradient. Therefore, effect of the pore air pressure for the landslide do not affect sand directly but indirectly though increasing of the hydraulic gradient of groundwater.
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