globalchange  > 气候减缓与适应
DOI: 10.1029/2012GL054280
论文题名:
Statistics of bedload transport over steep slopes: Separation of time scales and collective motion
作者: Heyman J.; Mettra F.; Ma H.B.; Ancey C.
刊名: Geophysical Research Letters
ISSN: 0094-9424
EISSN: 1944-9155
出版年: 2013
卷: 40, 期:1
起始页码: 128
结束页码: 133
语种: 英语
Scopus关键词: Bed-load transport ; Collective dynamics ; Collective motions ; Experimental studies ; Probabilistic framework ; Sampling technique ; Sediment discharge ; Sediment transport process ; Markov processes ; Probability density function ; Sediment transport ; Separation ; Time measurement ; bedload ; discharge ; experimental study ; Markov chain ; probability ; sampling ; sediment transport ; streamflow ; time series ; timescale
英文摘要: Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a process. In this paper, we present an experimental study of bedload transport over a steep slope flume for small to moderate Shields numbers. The sampling technique allows the acquisition of high-resolution time series of the solid discharge. The resolved time scales range from 10-1 s up to 105 s. We show that two distinct time scales can be observed in the probability density function for the waiting time between moving particles. We make the point that the separation of time scales is related to collective dynamics. Proper statistics of a Markov process including collective entrainment are derived. The separation of time scales is recovered theoretically for low entrainment rates. © 2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874868917&doi=10.1029%2f2012GL054280&partnerID=40&md5=8890d9513d8bdb8cee00545cfe800cb8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6688
Appears in Collections:气候减缓与适应

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作者单位: Laboratory of Environmental Hydraulics, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Switzerland

Recommended Citation:
Heyman J.,Mettra F.,Ma H.B.,et al. Statistics of bedload transport over steep slopes: Separation of time scales and collective motion[J]. Geophysical Research Letters,2013-01-01,40(1).
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