Turbulent Flow Structure and Flow Resistance of Hyper-concentratedSediment Laden Flow with Artificial Roughness

人工粗糙度超浓泥沙流的湍流结构与流动阻力

• 批准号: 22560519
• 负责人: OHMOTO Terunori
• 金额: $ 2.66万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560519/
• 关键词: 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

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

在具有均匀不锈钢方形肋的完全粗糙床层上研究了规则排列的方形粗糙度对明渠中流动阻力和湍流特性的影响。使用粒子图像测速（PIV）在沿着完全粗糙的床表面的垂直平面上对流向和垂直速度波动进行详细的空间测量。实验结果表明，三维方形粗糙度的流阻大于二维方形粗糙度的流阻，流阻最大值出现在横向间距δ/k（横向间距/粗糙度高度比）=1时，时均速度沿粗糙单元产生显着的空间规律性变化。 由大量悬浮在水中的粘土和/或淤泥颗粒组成的泥浆通常表现出非牛顿特性，但对其流变特性对完全发展的湍流结构的影响仍知之甚少。在本研究中，我们利用粒子图像测速（PIV）实验研究了二维方肋明渠中超浓缩泥沙满载流的阻力和动量传递。结果表明，与清水流相比，流变特性显着消散了沙丘床面的湍流脉动，增大了流阻

项目成果

Non-Newtonian properties and flowstructure in hyperconcentrated sedimentladen flow

超浓缩沉积物流的非牛顿特性和流动结构

• 发表时间: 2012
• 期刊: Published in Annals -International Journal of Engineering
• 作者: 大本照憲;平川隆一;Liany Hendratta and Terunori OHMOTO
• 通讯作者: Liany Hendratta and Terunori OHMOTO

透過性および不透過性の側岸凹部流れにおける抵抗特性と流動機構

透水与不透水边岸洼地流阻力特性及流动机理

• 发表时间: 2012
• 期刊: 土木学会論文集B1(水工学)
• 作者: Takayuki Tanaka;Terunori Ohmoto;平川隆一・渡邊訓甫・松本祥平・大本照憲;田中貴幸・大本照憲
• 通讯作者: 田中貴幸・大本照憲

Flows and Sediment Transport over Sand Bar of Macrotidal Estuary in the Kikuchi River,

菊池河大潮汐河口沙洲的流量和泥沙输送，

• 发表时间: 2012
• 期刊: CD-ROM Proceedings of the 9th International Symposium on Ecohydraulics (ISE 2012)
• 作者: Terunori Ohmoto;Ryuichi Hirakawa
• 通讯作者: Ryuichi Hirakawa

Influence of interaction between submerged longitudinal vegetation zone on generation of large scale organized horizontal vortices

水下纵向植被带相互作用对大尺度有组织水平涡生成的影响

• 发表时间: 2011
• 期刊: Proceedings of the 6th International Symposium on Environmental Hydraulics
• 作者: T.Tanaka;T.Ohmoto
• 通讯作者: T.Ohmoto

単一水制および連続水制の剥離域下流における流れ構造に関する研究

单坝与连续坝隔区下游水流结构研究

• 发表时间: 2012
• 期刊: 土木学会論文集 A2(応用力学)
• 作者: Takayuki Tanaka;Terunori Ohmoto;平川隆一・渡邊訓甫・松本祥平・大本照憲
• 通讯作者: 平川隆一・渡邊訓甫・松本祥平・大本照憲