Formation of front part in multigranular debris flow affecting the intermittent fluidity
| Project/Area Number |
22780140
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Forest science
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 土石流 / 土砂災害 / 防災 / 混合粒径 / 先頭部 |
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| Research Abstract |
Characteristics of flow mechanics affected by formation of front part in debris flows consisted of sediment particle with monogranular and two diameter mixed was examined by comparison between experimental and calculated results. Both experimental and calculated results were corresponded with monogranular debris flows, whereas disagreement was shown in debris flow with mixed particle size. The disagreement was considered to be induced by the dominant shear stress due to smaller sediment particles, resulting from inverse grading detected in flow body of the debris flows. In addition, it was indicated that the calculated velocity was underestimated than actual velocity, as the particle size segregation in the front part of multigranular debris flows did not affect the fluidity in the developing phase.
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Report
(3 results)
Research Products
(8 results)
