Movable Bed Armoring and Sediment Transportation

移动床装甲和沉积物运输

• 批准号: 63550373
• 负责人: EGASHIRA Shinji
• 金额: $ 0.45万
• 依托单位: KYOTO 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: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550373/
• 关键词: Sediment Transportation; Bed-load; Armor Coat; Sediment Sorting; Mountain Streams; 混合砂; アーマーコート; 粗粒化

Armored bed surface, which is composed of particles coaser than those of the parent material, can be produced even if in the conditions that all the particles of bed material are transported. The material of subsurface is usually finer. This emphasizes that an another mechanism except selective entrainment exists in the armering process of bed sediment.A multi-layer model, in which both the selective entrainment on bed surface and the vertical exchange of grains between surface and subsurface layers are taken into account, is prenosed. The model enables the bed material of surface to be coaser and that of subsurface to be finer. Flume tests are performed in conditions with no sediment supply as well as with sediment feeding. Particle size distributions are measured during the runs for transported sediment and bed layers. The results predicted with the model are compared well with data from the flume tests for spatial and temporal changes of those particle size distributions.

即使在床料颗粒全部输运的条件下，也能产生由比母质颗粒粗的颗粒组成的装甲床面。次表层的物质通常较细。提出了一个既考虑床面选择性卷吸作用，又考虑表层与次表层颗粒间垂向交换作用的多层模型。该模型可使表层床质粗，次表层床质细。水槽试验在无泥沙供应和有泥沙供应的条件下进行。粒径分布的测量过程中运行的输运沉积物和床层。模型预测的结果与水槽试验的数据进行了比较，这些颗粒尺寸分布的空间和时间的变化。

项目成果

Shinji Egashira: "Mechanism of Armoring Phenomena" Proc.Sediment Hydraulics,Bejing,China. (1990)

Shinji Egashira：“装甲现象的机制”，沉积水力学，北京，中国。

Shinji Egashira: "Flow Resistance and Sediment Transportation in Streams with Step-pool Bed Morphology" Int. Workshop on Fluvial Hydraulics of Mountain Regions, IAHR., pp.A31-A44, 1989.

Shinji Egashira：“具有阶梯池床形态的溪流中的流动阻力和沉积物输送” Int。

芦田和男: "移動床のア-マリング機構に関する研究" 京都大学防災研究所年報. 32号B-2. 517-526 (1989)

Kazuo Ashida：“移动地板的铠装机制的研究”京都大学防灾研究所年报第32 B-2号（1989）。

Egashira,S.;Ashida,K.: Int.Workshop on Fluvial Hydraulics of Mountain Regions,IAHR. (1989)

Egashira，S.；Ashida，K.：山区河流水力学国际研讨会，IAHR。

Shinji Egashira: "Mechanism of Armoring Phenomena" Proc. Sediment Hydraulics, Bejing, China 1990.

Shinji Egashira：“装甲现象的机制”Proc。