Mechanics of hyperconcentrated sediment laden flow

超浓缩沉积物流动的力学

• 批准号: 06650562
• 负责人: EGASHIRA Shinji
• 金额: $ 1.47万
• 依托单位: RITSUMEIKAN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650562/
• 关键词: multi-phase flow; debris flow; mud flow; sediment laden flow; constitutive equations; 固液混相流; 浮遊砂粒; 構成則・抵抗則; 土石流・泥流; 粒子間応力; レイノルズ応力

Discussions are made on the effect of particle size on the flow structure of sand particle-water mixture in order to investigate the mechanics of debris/mud flows and general sediment laden flows. The experimental results show that a quasi-laminar region is formed on the movable bed even in the flow of fine sediment-water mixture and its depth increases with the increase of sediment concentration as well as of particle size. Generally, the equilibrium bed slope can be predicted in terms of particle to particle friction angle and sediment concentration in the case that sediment particles behave as a laminar motion, which is common in debris flows composed of coarse sediment. But, it is rearized tha the bed slope becomes smaller than that of debris flows. A two-layr model which constitutes the upper and lower layrs is proposed to deseribe such phenomena. The shear stress in the upper layr is governed by turbulent motions. and in the lower layr by the constitutive relations developed by Egashira, etal.

为了研究泥石流和一般挟沙水流的运动机理，讨论了泥沙粒径对泥沙-水混合物流动结构的影响。实验结果表明，即使在细颗粒泥沙-水混合物的流动中，动床上也会形成准层流区，其深度随含沙量和粒径的增大而增大。一般来说，当泥沙颗粒呈层流运动时，可以根据颗粒间摩擦角和含沙量来预测平衡床面坡度，这在粗泥沙泥石流中是很常见的。但是，人们认识到，河床坡度变得比泥石流小。提出了一个由上下两层组成的双层模型来解释这种现象。上层的剪应力由湍流运动控制。在低层，由Egashira，埃塔尔

项目成果

Egashira, S., Yoshizumi, M.and T.Ito: "Sediment movement modes and transport capacity in open channel with rigid bed" Annual Journal of Hydraulic Eng., JSCE. Vol.40. (1996)

Egashira，S.，Yoshizumi，M.和T.Ito：“刚性床明渠中的沉积物运动模式和输送能力”水利工程年刊，JSCE。

江頭進治: "砂粒子を高濃度に含む流れに及ぼす粒子径の影響" 京都大学防災研究所年報. 37号B-2. 359-369 (1994)

Shinji Egashira：“颗粒尺寸对含有高浓度沙粒的流动的影响”，京都大学防灾研究所年度报告，37 No. 359-369 (1994)。

Ashida, K., Egashira, S., etal: "Governing equations of solid-liquid two phase flow and their application" Annual Journal of Hydraulic Eng., JSCE. VoL.39. (1995)

Ashida, K.、Egashira, S. 等人：“固液两相流控制方程及其应用”，液压工程年刊，JSCE。

Egashira, S., Sato.and K.Chishiro: "Effect of particle size on the flow structure of sand-water mixture" Annuals, DPRI,Kyoto Univ.Vol.37B-2. (1994)

Egashira, S.、Sato. 和 K.Chishiro：“颗粒尺寸对沙水混合物流动结构的影响”Annals，DPRI，Kyoto Univ.Vol.37B-2。

伊藤隆郭: "土石流の構成則とその通用性に関する研究" 土木学会第51回年次学術講演会. 第2部(A)(発表予定). (1996)

伊藤龙角：“泥石流的构成规则及其适用性研究”，第 51 届日本土木工程师学会学术年会第 2 部分（A）（待提交）。