DOI: 10.1002/2016GL071092
论文题名: The onset of sediment transport in vegetated channels predicted by turbulent kinetic energy
作者: Yang J.Q. ; Chung H. ; Nepf H.M.
刊名: Geophysical Research Letters
ISSN: 0094-8414
EISSN: 1944-8145
出版年: 2016
卷: 43, 期: 21 起始页码: 11261
结束页码: 11268
语种: 英语
英文关键词: critical condition
; incipient velocity
; sediment transport
; turbulence
; vegetation
Scopus关键词: Banks (bodies of water)
; Computational fluid dynamics
; Kinetics
; Sediment transport
; Sedimentation
; Sediments
; Shear stress
; Turbulence
; Vegetation
; Critical condition
; Critical velocities
; Emergent vegetation
; Incipient velocity
; Sediment transport rate
; Threshold condition
; Turbulence intensity
; Turbulent kinetic energy
; Kinetic energy
英文摘要: This laboratory study advances our understanding of sediment transport in vegetated regions, by describing the impact of stem density on the critical velocity, Ucrit, at which sediment motion is initiated. Sparse emergent vegetation was modeled with rigid cylinders arranged in staggered arrays of different stem densities. The sediment transport rate, Qs, was measured over a range of current speeds using digital imaging, and the critical velocity was selected as the condition at which the magnitude of Qs crossed the noise threshold. For both grain sizes considered here (0.6–0.85 mm and 1.7–2 mm), Ucrit decreased with increasing stem density. This dependence can be explained by a threshold condition based on turbulent kinetic energy, kt, suggesting that near-bed turbulence intensity may be a more important control than bed shear stress on the initiation of sediment motion. The turbulent kinetic energy model unified the bare bed and vegetated channel measurements. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84997841014&doi=10.1002%2f2016GL071092&partnerID=40&md5=c998b4bd1f730ca523335d0f91a4728e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9377
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 Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Yang J.Q.,Chung H.,Nepf H.M.. The onset of sediment transport in vegetated channels predicted by turbulent kinetic energy[J]. Geophysical Research Letters,2016-01-01,43(21).