globalchange  > 气候减缓与适应
DOI: 10.1002/2014GL060525
论文题名:
Sedimentary bed evolution as a mean-reverting random walk: Implications for tracer statistics
作者: Martin R.L.; Purohit P.K.; Jerolmack D.J.
刊名: Geophysical Research Letters
ISSN: 0094-9812
EISSN: 1944-9543
出版年: 2014
卷: 41, 期:17
起始页码: 6152
结束页码: 6159
语种: 英语
Scopus关键词: Random processes ; Rivers ; Sediment transport ; Bed-load transport ; Erosion and deposition ; Flume experiment ; Landscape evolutions ; Ornstein-Uhlenbeck ; Ornstein-Uhlenbeck process ; Transport systems ; Waiting time distributions ; Probability distributions ; avalanche ; bedload ; experimental study ; landscape evolution ; numerical model ; river bed ; sediment transport ; statistical analysis
英文摘要: Sediment tracers are increasingly employed to estimate bed load transport and landscape evolution rates. Tracer trajectories are dominated by periods of immobility ("waiting times") as they are buried and reexcavated in the stochastically evolving river bed. Here we model bed evolution as a random walk with mean-reverting tendency (Ornstein-Uhlenbeck process) originating from the restoring effect of erosion and deposition. The Ornstein-Uhlenbeck model contains two parameters, a and b, related to the particle feed rate and range of bed elevation fluctuations, respectively. Observations of bed evolution in flume experiments agree with model predictions; in particular, the model reproduces the asymptotic t-1 tail in the tracer waiting time exceedance probability distribution. This waiting time distribution is similar to that inferred for tracers in natural gravel streams and avalanching rice piles, indicating applicability of the Ornstein-Uhlenbeck mean-reverting model to many disordered transport systems with tracer burial and excavation. © 2014. American Geophysical Union.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907919462&doi=10.1002%2f2014GL060525&partnerID=40&md5=17ea85e59626847ed74d167e56bc1506
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7076
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作者单位: Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, United States

Recommended Citation:
Martin R.L.,Purohit P.K.,Jerolmack D.J.. Sedimentary bed evolution as a mean-reverting random walk: Implications for tracer statistics[J]. Geophysical Research Letters,2014-01-01,41(17).
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