1998 Fiscal Year Final Research Report Summary
Analysis on sediment transport under wave action as particle-fluid interacting system
| Project/Area Number |
08455225
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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 |
水工水理学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
SAWAMOTO Masaki TOHOKU UNIVERSITY,DEPARTMENT OF CIVIL ENGINEERING,PROFESSOR, 大学院・工学研究科, 教授 (90016519)
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| Co-Investigator(Kenkyū-buntansha) |
GOTOH Hitoshi KYOTO UNIVERSITY,DEPARTMENT OF CIVIL ENGINEERING,ASSOCIATE PROFESSOR, 大学院・工学研究科, 助教授 (40243068)
IZUMI Norihiro TOHOKU UNIVERSITY,DEPARTMENT OF CIVIL ENGINEERING,ASSOCIATE PROFESSOR, 大学院・工学研究科, 助教授 (10260530)
TANAKA Hitoshi TOHOKU UNIVERSITY,DEPARTMENT OF CIVIL ENGINEERING,PROFESSOR, 大学院・工学研究科, 教授 (30171755)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Sediment Transport / Sheet Flow Regime / Wave Boundary Layer / Channel Inception / Granular Material |
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| Research Abstract |
Aiming an application to the sediment transport analysis in sheet flow regime, basic mechanism of sediment-fluid interaction were studied from various view points.
Sawamoto carried out two kind of experiments. In the first, fluid force exerting on particles were measured in dense mixture flow and a diagram of drag coefficient was proposed. In the second, velocity distributions of partic1e flow in steep chute were observed and shear stress was formulated.
Tanaka analysed turbulent structure and bed shear stress under random wave action. Applying a spectral analysis, significant progress was achieved. The results were compared with experiments and k-epsilon model and reliability was checked.
Izumi investigated the interaction between flow and movable beds theoretically. Formulating the stability of bed erosion by linear theory, it was shown that space of gullies is controlled by fluid-bed stability.
Gotoh studied the effect of granular characteristics of sediment from two view points. At first, a series of experiments on collision between movable bed and saltationg particle were carried out. The results were utilized in the simulation. Secondly, particle movements were simulated by Lagrangian method.
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