| Project/Area Number |
22560519
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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 |
Hydraulic engineering
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| Research Institution | Kumamoto University |
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Principal Investigator |
OHMOTO Terunori 熊本大学, 大学院・自然科学研究科, 教授 (30150494)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 乱流 / 抵抗則 / 高濃度土砂流 / 開水路乱流 / 完全粗面 / Roughness Sublayer / 三次元粗度 / 円柱粗度 / 球状粗度 / Form induced stress |
|---|
| Research Abstract |
Effects of regularly arrayed square roughness on flow resistanceand turbulent characteristics in an open channel have been investigated over a completelyrough-bed with uniform stainless square ribs. Detailed spatial measurements of streamwiseand vertical velocity fluctuations were conducted using Particle Image Velocimetry (PIV)in a vertical plane along the completely rough bed surface. Experimental results indicatedthat flow resistance with three-dimensional square roughness is higher than that withtwo-dimensional square roughness, the maximum value of flow resistance appeared intransverse spacingδ/ｋ （transverse spacing/roughness height ratio）=1 and significantdegrees of spatially regular variation in the time-averaged velocities were generatedalong the rough elements.Mud flows, debris flows or slurries, made up of a large amountof clay and/or silt particles suspended in water, often show non-Newtonian propertiesbut remain poorly understood concerning the impacts of their rheological properties onfully developed turbulent structure. In this study, we experimentally investigatedresistance and momentum transport of hyper- concentrated sediment laden-flow in an openchannel with two-dimensional square ribs by using Particle Image Velocimetry(PIV). Theresults showed that rheological properties significantly dissipated the turbulent flowfluctuations over the dune bed and augmented the flow resistance by comparison with theclear water flow
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