Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025410 |
An Experimental Study of Longitudinal Incisional Grooves in a Mixed Bedrock-Alluvial Channel | |
Inoue, Takuya1; Nelson, Jonathan M.2 | |
2020-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; USA |
英文摘要 | Natural bedrock rivers have various bedforms created by erosion. Flow-parallel incisional grooves formed longitudinally in bedrock are one common example of such bedforms. Although several studies have been conducted regarding these grooves, their formation processes are not well understood. In this study, we conducted a flume experiment to investigate the relationship between the flow structure and longitudinal grooves. The experimental results strongly suggest that longitudinal grooves are formed by moving sediment concentrated in multiple longitudinal pathways by turbulence-driven secondary flows. The sediment preferentially abrades the bedrock along these flow-parallel pathways resulting in longitudinal grooves in the bedrock. Measurements of the flow velocity distribution show that the positions of secondary flow cells producing the initial formation of the grooves are altered by the formation of those grooves. Because displaced secondary flows tend to make the sediment collide with the sidewalls of the longitudinal grooves, the grooves grow wider over time and some grooves partially combine with other adjacent grooves. The initial maximum number of longitudinal grooves N-max strongly depends on the river width-depth ratio B/D, which defines the number of secondary flow cells, and can be expressed as N-max = 0.5B/D. However, because some grooves coalesce with other grooves due to the effects of the displacement of secondary flows, the average number of grooves showed a relationship that can be expressed as N = 0.41B/D. Based on this relationship, we inversely estimated the flow discharge of the Abashiri River using the number of longitudinal grooves observed in the river. The result was consistent with the observed annual maximum flow discharge of the river. This suggests that the number of longitudinal grooves can be used as an indicator for estimation of the formative flow discharge in bedrock rivers. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000538000800003 |
WOS关键词 | BED-LOAD ; ROUGHNESS MODEL ; RIVER INCISION ; EROSION ; TURBULENCE ; SEDIMENT ; COVER |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280573 |
专题 | 资源环境科学 |
作者单位 | 1.Civil Engn Res Inst Cold Reg, River Engn Res Team, Sapporo, Hokkaido, Japan; 2.US Geol Survey, Geomorphol & Sediment Transport Lab, Golden, CO USA |
推荐引用方式 GB/T 7714 | Inoue, Takuya,Nelson, Jonathan M.. An Experimental Study of Longitudinal Incisional Grooves in a Mixed Bedrock-Alluvial Channel[J]. WATER RESOURCES RESEARCH,2020,56(3). |
APA | Inoue, Takuya,&Nelson, Jonathan M..(2020).An Experimental Study of Longitudinal Incisional Grooves in a Mixed Bedrock-Alluvial Channel.WATER RESOURCES RESEARCH,56(3). |
MLA | Inoue, Takuya,et al."An Experimental Study of Longitudinal Incisional Grooves in a Mixed Bedrock-Alluvial Channel".WATER RESOURCES RESEARCH 56.3(2020). |
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