DOI: 10.1002/2014GL059826
论文题名: Numerical investigation of internal wave-induced sediment motion: Resuspension versus entrainment
作者: Olsthoorn J. ; Stastna M.
刊名: Geophysical Research Letters
ISSN: 0094-10142
EISSN: 1944-9873
出版年: 2014
卷: 41, 期: 8 起始页码: 2876
结束页码: 2882
语种: 英语
英文关键词: Internal Waves
; Resuspension
; Sediment Transport
Scopus关键词: Sediment transport
; Sedimentation
; Bottom boundary layer
; Dimensionless parameters
; Explicit representation
; Internal waves
; Numerical investigations
; Re-suspension
; Sediment concentration
; Three dimensional effect
; Boundary layers
; benthic boundary layer
; bubble
; entrainment
; hydrodynamics
; internal wave
; numerical model
; resuspension
; sediment transport
; shoaling wave
; three-dimensional modeling
; topography
英文摘要: We present numerical simulations of near-bed instability induced by internal waves shoaling over topography using a model with an explicit representation of the sediment concentration. We find that not all separation bubble-bursting events lead to resuspension, though all lead to significant transport out of the bottom boundary layer. This transport can significantly enhance chemical exchange across the bottom boundary layer. When resuspension occurs, we find that it is largely due to two-dimensional evolution of the separation bubble during the bursting process. Three-dimensionalization occurs once the resuspended sediment cloud is transported out of the bottom boundary layer, and hence, redeposition is strongly influenced by three-dimensional effects. We derive a criterion for resuspension over a linearly sloping bottom in terms of two dimensionless parameters that encapsulate the sediment properties. Key Points Internal waves can induce resuspension in a coupled hydrodynamic-sediment model True resuspension is provided for sufficiently vigorous shear only This paper quantifies when true resuspension will occur ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899036608&doi=10.1002%2f2014GL059826&partnerID=40&md5=bd8636ec5c4ec41959b9895a0cd1a553
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7406
Appears in Collections: 气候减缓与适应
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作者单位: Applied Mathematics Department, University of Waterloo, Waterloo, ON, Canada
Recommended Citation:
Olsthoorn J.,Stastna M.. Numerical investigation of internal wave-induced sediment motion: Resuspension versus entrainment[J]. Geophysical Research Letters,2014-01-01,41(8).