DOI: 10.1002/2017JC013411
Scopus记录号: 2-s2.0-85042404047
论文题名: Near-Bed Turbulent Kinetic Energy Budget Under a Large-Scale Plunging Breaking Wave Over a Fixed Bar
作者: van der Zanden J. ; van der A D.A. ; Cáceres I. ; Hurther D. ; McLelland S.J. ; Ribberink J.S. ; O'Donoghue T.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1429
结束页码: 1456
语种: 英语
英文关键词: breaker bar
; breaking waves
; surf zone
; turbulence
; wave bottom boundary layer
; wave flume experiment
Scopus关键词: anemometer
; bar
; benthic boundary layer
; breaking wave
; energy budget
; flume experiment
; hydrodynamics
; kinetic energy
; Reynolds number
; shear stress
; surf zone
; turbulence
; wave breaking
英文摘要: Hydrodynamics under regular plunging breaking waves over a fixed breaker bar were studied in a large-scale wave flume. A previous paper reported on the outer flow hydrodynamics; the present paper focuses on the turbulence dynamics near the bed (up to 0.10 m from the bed). Velocities were measured with high spatial and temporal resolution using a two component laser Doppler anemometer. The results show that even at close distance from the bed (1 mm), the turbulent kinetic energy (TKE) increases by a factor five between the shoaling, and breaking regions because of invasion of wave breaking turbulence. The sign and phase behavior of the time-dependent Reynolds shear stresses at elevations up to approximately 0.02 m from the bed (roughly twice the elevation of the boundary layer overshoot) are mainly controlled by local bed-shear-generated turbulence, but at higher elevations Reynolds stresses are controlled by wave breaking turbulence. The measurements are subsequently analyzed to investigate the TKE budget at wave-averaged and intrawave time scales. Horizontal and vertical turbulence advection, production, and dissipation are the major terms. A two-dimensional wave-averaged circulation drives advection of wave breaking turbulence through the near-bed layer, resulting in a net downward influx in the bar trough region, followed by seaward advection along the bar's shoreward slope, and an upward outflux above the bar crest. The strongly nonuniform flow across the bar combined with the presence of anisotropic turbulence enhances turbulent production rates near the bed. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114572
Appears in Collections: 气候减缓与适应
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作者单位: School of Engineering, University of Aberdeen, Aberdeen, United Kingdom; Department of Water Engineering and Management, University of Twente, Enschede, Netherlands; Laboratori d'Enginyeria Marítima, Universitat Politècnica de Catalunya, Barcelona, Spain; LEGI, CNRS, University of Grenoble Alpes, Grenoble, France; Department of Geography, Environment and Earth Sciences, University of Hull, Cottingham Road, Hull, United Kingdom
Recommended Citation:
van der Zanden J.,van der A D.A.,Cáceres I.,et al. Near-Bed Turbulent Kinetic Energy Budget Under a Large-Scale Plunging Breaking Wave Over a Fixed Bar[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)