Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR020233 |
Flow resistance and hydraulic geometry in contrasting reaches of a bedrock channel | |
Ferguson, R. I.; Sharma, B. P.; Hardy, R. J.; Hodge, R. A.; Warburton, J. | |
2017-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Assumptions about flow resistance in bedrock channels have to be made for mechanistic modeling of river incision, paleoflood estimation, flood routing, and river engineering. Field data on bedrock flow resistance are very limited and calculations generally use standard alluvial-river assumptions such as a fixed value of Manning's n. To help inform future work, we measured how depth, velocity, and flow resistance vary with discharge in four short reaches of a small bedrock channel, one with an entirely rock bed and the others with 20-70% sediment cover, and in the alluvial channel immediately upstream. As discharge and submergence increase in each of the partly or fully alluvial reaches there is a rapid increase in velocity and a strong decline in both n and the Darcy-Weisbach friction factor f. The bare-rock reach follows a similar trend from low to medium discharge but has increasing resistance at higher discharges because of the macroroughness of its rock walls. Flow resistance at a given discharge differs considerably between reaches and is highest where the partial sediment cover is coarsest and most extensive. Apart from the effect of rough rock walls, the flow resistance trends are qualitatively consistent with logarithmic and variable-power equations and with nondimensional hydraulic geometry, but quantitative agreement using sediment D-84 as the roughness height is imperfect. |
英文关键词 | mean velocity flow resistance wall roughness relative submergence boulders |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400160500030 |
WOS关键词 | ROUGHNESS MODEL ; ALLUVIAL COVER ; TRANSPORT ; SEDIMENT ; VELOCITY |
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/21194 |
专题 | 资源环境科学 |
作者单位 | Univ Durham, Dept Geog, Durham, England |
推荐引用方式 GB/T 7714 | Ferguson, R. I.,Sharma, B. P.,Hardy, R. J.,et al. Flow resistance and hydraulic geometry in contrasting reaches of a bedrock channel[J]. WATER RESOURCES RESEARCH,2017,53(3). |
APA | Ferguson, R. I.,Sharma, B. P.,Hardy, R. J.,Hodge, R. A.,&Warburton, J..(2017).Flow resistance and hydraulic geometry in contrasting reaches of a bedrock channel.WATER RESOURCES RESEARCH,53(3). |
MLA | Ferguson, R. I.,et al."Flow resistance and hydraulic geometry in contrasting reaches of a bedrock channel".WATER RESOURCES RESEARCH 53.3(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论