Mechanics of Sediment Transport of Graded Materials and Fluvial Sorting
分级材料输沙机理及河流分选
基本信息
- 批准号:01550401
- 负责人:
- 金额:$ 1.41万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1989
- 资助国家:日本
- 起止时间:1989 至 1990
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Sediment transport of graded materials often shows non-equilibrium behavior and subsequently it accompanies fluvial sorting process. In order to describe the phenomena it brings about, non-equilibrium transport model characterized by pick-up rate and step length for each grain size.When the sediment transport supplied from the upstream region is suppressed, the bed-surface adjusts its composition (size distribution) by selective movement of sediment according to the size. Particularly, the supplied sediment is zero, the bed is coarsened and the transport rate over it becomes zero increasingly from the upstream end (armor coat formation and propagation). While, the suppressed sediment is not zero, all size-fraction of sediment are still transported (the transport rate becomes equal to the supplied one finally) but the bed surface is obviously coarsened (pavement). These two different types of bed coarsening process could be described by the non-equilibrium transport model proposed in th … More is study.Besides monotonous sorting, alternate sortings are often observed : longitudinally alternate sorting and laterally alternate sorting (longitudinal stripes of sorting). These sortings do not require the forced change of supplied sediment. Non-equilibrium transport for each grain size and the change of bed-surface composition brings about an instability of the bed-surface composition. The formation processes could be described by the non-equilibrium transport model proposed in this study.In a stream with longitudinally alternate sorting, the longitudinal change of bed roughness severely changes the turbulent structure and subsequently the characteristics of suspended sediment transport over it. Based on the turbulence measurements, a model to describe the relaxation process of Reynolds-stress distribution due to the change of the bed shear stress was derived, which was a convolution-integral type with an impulse response. The similarity between the turbulent momentum exchange and the turbulent transport of suspended sediment suggested a description of non-equilibrium concentration distribution of suspended sediment with the relaxation model prepared for the Reynolds-stress distribution. Less
级配材料的泥沙输移往往表现出非平衡特性,并伴随着河流分选过程。为了描述这一现象,本文采用了以各粒径泥沙的起动率和步长为特征的非平衡输沙模型,当上游输沙受到抑制时,床面根据粒径大小选择性地输沙,从而调整其组成(粒径分布)。特别地,所供给的沉积物为零,床被粗化,并且在其上的输送速率从上游端逐渐变为零(装甲涂层形成和扩展)。当泥沙被抑制不为零时,泥沙仍被输移(输移率最终与供给率相等),但床面明显变粗(铺沙)。这两种不同类型的床层粗化过程可以用本文提出的非平衡输运模型来描述。 ...更多信息 除了单一的排序外,还经常观察到交替排序:纵向交替排序和横向交替排序(排序的纵向条纹)。这些分选不需要强制改变所提供的沉积物。各粒径的非平衡输运和床面组成的变化导致床面组成的不稳定。本文提出的非平衡输运模型可以描述悬沙的形成过程,在纵向交替分选的河流中,床面粗糙度的纵向变化严重地改变了湍流结构,从而改变了悬沙的输运特性。建立了一个描述床面切应力变化引起的沙应力分布松弛过程的卷积-积分型脉冲响应模型。紊动动量交换与悬移质紊动输移的相似性表明,悬移质浓度的非平衡分布可用应力分布的松弛模型来描述。少
项目成果
期刊论文数量(31)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Tsujimoto, T.: "Longitudinal stripes of alternate lateral sorting due to cellular secondary currents" Proc. 23rd(IAHR) Congress, Ottawa, Canada. Vol. 2. 17-24 (1989)
Tsujimoto, T.:“由于细胞二次电流导致的交替横向排序的纵向条纹”Proc。
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
辻本 哲郎: "底面せん断応力が変化する開水路流れの特性" 水工学論文集. 34. 433-438 (1990)
Tetsuro Tsujimoto:“具有不同底部剪切应力的明渠水流特征”《水利工程学报》34. 433-438 (1990)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
辻本 哲郎: "Longitudinal Stripes of alterrate lateral sorting due to cellular seconday currents" Proc.23rd IAHR Congress,Ottawa,Canada. 2. 17-24 (1989)
Tetsuro Tsujimoto:“由于细胞二次电流导致的交替横向排序的纵向条纹”,Proc.23rd IAHR 大会,加拿大渥太华,2. 17-24 (1989)。
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- 影响因子:0
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辻本 哲郎: "混合砂礫床の粗粒化について" 土木学会論文集. 417. 91-98 (1990)
Tetsuro Tsujimoto:“关于混合沙子和砾石层的粗化”日本土木工程师学会会刊 417. 91-98 (1990)。
- DOI:
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- 期刊:
- 影响因子:0
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- 通讯作者:
辻本 哲郎: "非平衡状態で浮遊砂濃度分布" 土木学会論文集. 423. 63-71 (1990)
Tetsuro Tsujimoto:“非平衡条件下的悬浮泥沙浓度分布”,日本土木工程师学会学报 423. 63-71 (1990)。
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TSUJIMOTO Tetsuro其他文献
TSUJIMOTO Tetsuro的其他文献
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{{ truncateString('TSUJIMOTO Tetsuro', 18)}}的其他基金
Modeling of Sediment Dynamics According to Geological Heterogeneity of River Basin with Particular References to Sorting, Abrasion and Confluence Processes
根据流域地质非均质性的沉积物动力学建模,特别是分选、磨损和汇流过程
- 批准号:
22656108 - 财政年份:2010
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Study on Mechanisms of Material Cycling in River Ecosystem with Water, Material and Organism Dynamics
河流生态系统物质循环机制与水、物质和生物动力学研究
- 批准号:
19360223 - 财政年份:2007
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Dynamic conservation mechanism of temporal water area and its roles in preservation of riparian ecosystem
时域水域动态保护机制及其在河岸生态系统保护中的作用
- 批准号:
14350264 - 财政年份:2002
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study on Disaster caused by Heavy rainfall in Tokai Region, Japan at September 2001
2001年9月日本东海地区强降雨灾害研究
- 批准号:
12800012 - 财政年份:2000
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Special Purpose.
Study on Change in River Landscape in Alluvial Fun Rivers and Its Restoration
冲积乐趣河河流景观变化及其恢复研究
- 批准号:
11650523 - 财政年份:1999
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on the method to estimate the subsurface flow in alluvial sandbars
冲积沙洲地下流量估算方法研究
- 批准号:
11555133 - 财政年份:1999
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Mechanism of blown sand with vegetation of coastal area from multi-phase flow dynamics and methods of blown-sand control
从多相流动力学角度探讨沿海植被风沙机理及风沙控制方法
- 批准号:
08650593 - 财政年份:1996
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Design of Erosion-Protection of Flood Plain and Side Slope of Levee by Vegetation
河滩及堤岸边坡植被防冲刷设计
- 批准号:
07555452 - 财政年份:1995
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Open-Channel Flow Control by Vegetation and Artificial Roughness and Hydraulic Design of Multi-Function Channels
植被和人工粗糙度明渠流量控制及多功能渠道水力设计
- 批准号:
06650558 - 财政年份:1994
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Study on Effects of Roughness Patterns on Turbulent Structure though Field Measurements
现场测量研究粗糙度模式对湍流结构的影响
- 批准号:
03650418 - 财政年份:1991
- 资助金额:
$ 1.41万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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