Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017WR022280 |
The Effect of Episodic Sediment Supply on Bedload Variability and Sediment Mobility | |
Elgueta-Astaburuaga, M. A.1; Hassan, M. A.1; Saletti, M.1; Clarke, G. K. C.2 | |
2018-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:9页码:6319-6335 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | The effect of sediment supply on sediment mobility is analyzed for a poorly sorted (0.5-64 mm) experimental bed. Water discharge was held constant over a sequence of seven runs, and 300 kg of sediment was supplied during each run in different magnitudes and frequencies. In runs with constant feed bedload transport rate increased gradually. In contrast, runs that received large sediment pulses showed pronounced increases in bedload rate as the bed surface got finer, followed by monotonic declines as the bed surface coarsened. We studied the temporal scales of bedload fluctuations by means of sample autocorrelation coefficients and the rates of decrease in bedload fluctuation with sampling time scale. The significant trends caused in bedload rate by large occasional sediment pulses increased long-term autocorrelation in bedload rate time series relative to runs with constant feed. Bed evolution and local changes in sediment storage caused multiple scales of variability in bedload rate, which increased autocorrelation and caused long-term persistence in bedload series over periods with a nearly constant mean. The scaling statistics of bedload transport fluctuation depended on grain size, and those for total bedload were similar to those for fine gravel (2-8 mm), which was fully mobile and dominated bedload transport. Grain size dependence of bedload fluctuation was not affected by changes in sediment feed because water discharge and sediment texture were held constant. |
英文关键词 | bedload transport bedload scaling flume experiment sediment supply |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448088100029 |
WOS关键词 | BED-LOAD TRANSPORT ; GRAVEL TRANSPORT ; CHANNEL ; PULSES ; FLUCTUATIONS ; EVOLUTION ; RIVERS ; RANGE ; CREEK ; MODEL |
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/20802 |
专题 | 资源环境科学 |
作者单位 | 1.Univ British Columbia, Dept Geog, Vancouver, BC, Canada; 2.Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada |
推荐引用方式 GB/T 7714 | Elgueta-Astaburuaga, M. A.,Hassan, M. A.,Saletti, M.,et al. The Effect of Episodic Sediment Supply on Bedload Variability and Sediment Mobility[J]. WATER RESOURCES RESEARCH,2018,54(9):6319-6335. |
APA | Elgueta-Astaburuaga, M. A.,Hassan, M. A.,Saletti, M.,&Clarke, G. K. C..(2018).The Effect of Episodic Sediment Supply on Bedload Variability and Sediment Mobility.WATER RESOURCES RESEARCH,54(9),6319-6335. |
MLA | Elgueta-Astaburuaga, M. A.,et al."The Effect of Episodic Sediment Supply on Bedload Variability and Sediment Mobility".WATER RESOURCES RESEARCH 54.9(2018):6319-6335. |
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