2002 Fiscal Year Final Research Report Summary
A SEDIMENT DISCHARGE FORMULA FOR VARIOUS TYPES OF SEDIMENT TRANSPORT IN A STEEP OPEN CHANNEL
| Project/Area Number |
13650570
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Kyushu University |
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Principal Investigator |
HASHIMOTO Haruyuki Kyushu University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (70117216)
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| Project Period (FY) |
2001 – 2002
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| Keywords | bed load / sediment-water mixture flow / debris flow / suspended load / hyperconcentrated flow / mud flow / two-layer model |
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| Research Abstract |
Four main types of sediment transport and their two intermediate types can be distinguished on movable bed in a steep open channel ; those are bed and suspended load types, debris and mud flow types, and intermediate types between bed load and debris flow types. The flow model for hyperconcentrated sand-water mixtures proposed by Hirano and Hashimoto (1995, 1997) can be applied to all types of flows with sediment transport in a steep open channel. The flow model consists of granular and inertial layers ; the intergranular stresses play major role in the former layer and inertial forces in the latter layer. On the basis of the flow model, sediment discharge formulas have been derived by Hirano and Hashimoto (1996, 1998 ). In the present study the sediment discharge formulas are compared with the experimental results and also with the other formulas. The calculation of sediment discharge formulas derived by Hirano and Hashimoto (1996, 1998 ) shows good agreement with experimental results.
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