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.

即使在所有床料颗粒都被输送的情况下，也可以产生由比母材更粗的颗粒组成的装甲床表面。次表面的材料通常较细。这强调了床层沉积物的武装过程中存在除选择性夹带之外的另一种机制。一个多层模型，其中既考虑了床表面的选择性夹带，又考虑了表层和地下层之间颗粒的垂直交换。预感。该模型使表层床料较粗，地下床料较细。水槽测试在无沉积物供应和有沉积物供给的条件下进行。在运行过程中测量输送的沉积物和床层的粒度分布。使用该模型预测的结果与来自水槽测试的数据进行了很好的比较，以了解这些颗粒尺寸分布的空间和时间变化。

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。