DOI: 10.1002/2016GL069579
论文题名: Acoustic observations of near-bed sediment concentration and flux statistics above migrating sand dunes
作者: Wilson G.W. ; Hay A.E.
刊名: Geophysical Research Letters
ISSN: 0094-9668
EISSN: 1944-9399
出版年: 2016
卷: 43, 期: 12 起始页码: 6304
结束页码: 6312
语种: 英语
英文关键词: acoustics
; boundary layer
; granular gases
; sediment transport
Scopus关键词: Acoustics
; Boundary layers
; Sediment transport
; Sedimentation
; Sediments
; Stochastic systems
; Exponential distributions
; Granular gas
; Local approximation
; Negative binomial distribution
; Sediment concentration
; Sediment grain size
; Statistical distribution
; Unidirectional flow
; Probability distributions
英文摘要: A coherent Doppler profiler was used to measure coincident time series of velocity (u,w), sediment mass concentration (c), and sediment grain size (d), above mobile sand dunes in unidirectional flow (∼1 m/s, ∼1 m water depth). The measurements are used to extract statistical distributions of sediment concentration and flux just above the bed. Observed mass fluxes (uc,wc) were well fit by quasi-exponential distributions, at all positions along the dune profile, similar to previous observations of single-particle momenta for bed load over flat beds. Observed concentrations of moving particles were well fit by negative-binomial distributions, also similar to previous observations over flat beds. These probability distributions relate to two recent stochastic theories, previously derived and verified for uniform flow over flat beds. It is hypothesized that these theories may also be used as a local approximation in natural-scale flows with bed forms. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977143073&doi=10.1002%2f2016GL069579&partnerID=40&md5=baada40c0f78c9414fb4862df73a28d9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10631
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Oceanography, Dalhousie University, Halifax, NS, Canada
Recommended Citation:
Wilson G.W.,Hay A.E.. Acoustic observations of near-bed sediment concentration and flux statistics above migrating sand dunes[J]. Geophysical Research Letters,2016-01-01,43(12).