An Experimental Investigation of Acceleration‐Skewed Oscillatory Flow Over Vortex Ripples

Jing Yuan 1 , Dongxu Wang 1 Plain Language Summary In shallow coastal regions, shoaling waves produce oscillatory bottom flows, which create sand 3 ripples on a sandy seabed. The acceleration skewness of the oscillatory flow is a result of the 4 nonlinear feature of the overlying water waves, and it can differentiate the two half-cycles of 5 the oscillatory flow and therefore leading to a net (cycle-averaged) sediment transport. In this 6 study, we use an oscillatory water tunnel and particle image velocimetry to investigate the oscil7 latory boundary layer flow over vortex ripples with a focus on the effect of acceleration skewness. 8 Our measurements provide detailed descriptions of the formation-ejection process of coherent 9 vortices, which is produced by the flow separation behind the ripple crest. Some useful observa10 tions on flow turbulence are also provided. The results showed that acceleration skewness can 11 substantially differentiate the two coherent vortices developed within the two half cycles. The 12 offshore-side vortex can carry more turbulence over the ripple crest than the onshore-side vortex, 13 which possibly leads to some net onshore sediment transport rate. We also showed that the 14 ripple-averaged flow is fairly close to that over a flat bed, so flat-bed boundary layer model can 15 be possibly used for rippled bed with some parameterizations. 16

• Publication year

  2019

• Venue

  Journal of Geophysical Research

• Publication date

  2019-12-01

• Fields of study

  Geology, Environmental Science

• Identifiers
  DOI 10.1029/2019jc015487
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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• Turbulent dynamics of sinusoidal oscillatory flow over a wavy bottom

  2018cited by this paper
• Experimental Investigation of Total Bottom Shear Stress for Oscillatory Flows Over Sand Ripples

  2018influential reference
• On Bedload and Suspended Load Measurement Performances in Sheet Flows Using Acoustic and Conductivity Profilers

  2018cited by this paper
• Bottom‐slope‐induced net sheet‐flow sediment transport rate under sinusoidal oscillatory flows

  2017cited by this paper
• 1DV structure of turbulent wave boundary layers

  2016cited by this paper
• Experimental and theoretical study of wave–current turbulent boundary layers

  2015cited by this paper
• Unsteady stress partitioning and momentum transfer in the wave bottom boundary layer over movable rippled beds

  2014cited by this paper
• Observations of the space‐time structure of flow, turbulence, and stress over orbital‐scale ripples

  2014cited by this paper
• EXPERIMENTAL STUDY OF TURBULENT OSCILLATORY BOUNDARY LAYERS IN A NEW OSCILLATORY WATER TUNNEL

  2012cited by this paper
• Large-eddy simulation of wave turbulent boundary layer over rippled bed

  2012cited by this paper
• Experimental study of the turbulent boundary layer in acceleration-skewed oscillatory flow

  2011cited by this paper
• Suspension and near-bed load sediment transport processes above a migrating, sand-rippled bed under shoaling waves

  2011influential reference
• Measurements of sheet flow transport in acceleration-skewed oscillatory flow and comparison with practical formulations

  2010cited by this paper
• LABORATORY STUDY ON SAND TRANSPORT OVER RIPPLES DUE TO ASYMMETRIC OSCILLATORY FLOWS

  2010cited by this paper
• Coastal and Estuarine Processes

  2009cited by this paper
• Ripple morphology under oscillatory flow: 1. Prediction

  2009cited by this paper
• 2DV modelling of sediment transport processes over full-scale ripples in regular asymmetric oscillatory flow

  2008cited by this paper
• Ripple Morphology under Oscillatory Flow

  2008cited by this paper
• Detailed measurements of velocities and suspended sand concentrations over full-scale ripples in regular oscillatory flow

  2007cited by this paper
• Effect of stratification due to suspended sand on velocity and concentration distribution in unidirectional flows

  2007cited by this paper
• Full‐scale observations of wave‐induced vortex generation over a rippled bed

  2007cited by this paper
• Modelling and measurement of sand transport processes over full-scale ripples in oscillatory flow

  2006cited by this paper
• Parameterization and simulation of near bed orbital velocities under irregular waves in shallow water

  2006cited by this paper
• Sediment Transport over Ripples in Oscillatory Flow

  2006cited by this paper
• The dimensions of sand ripples in full-scale oscillatory flows

  2006cited by this paper
• On the relationships between local vortex identification schemes

  2005cited by this paper
• Coherent structures in an oscillatory separated flow: numerical experiments

  2004cited by this paper
• Vortex dynamics around a solid ripple in an oscillatory flow

  2004cited by this paper
• Flow tunnel measurements of velocities and sand flux in oscillatory sheet flow for well-sorted and graded sands

  2004cited by this paper
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  2003cited by this paper
• Discrete vortex modelling of oscillatory flow over ripples

  2002cited by this paper
• Turbulent Flows

  2000cited by this paper
• Laboratory measurement of bottom shear stress on a movable bed

  2000cited by this paper
• Three-dimensional oscillatory flow over steep ripples

  2000cited by this paper
• Modeling stratified wave and current bottom boundary layers on the continental shelf

  2000cited by this paper
• Wave plus current over a ripple-covered bed

  1999cited by this paper
• Mechanisms for generating coherent packets of hairpin vortices in channel flow

  1999cited by this paper
• Dynamics of ripple bed vortices

  1998cited by this paper
• Oscillating turbulent flow over very rough surfaces

  1996cited by this paper
• Sheet flow and suspension of sand in oscillatory boundary layers

  1995cited by this paper
• Ripple geometry in wave‐dominated environments

  1994cited by this paper
• Vortex dynamics

  1993cited by this paper
• Coastal bottom boundary layers and sediment transport

  1993cited by this paper
• Vorticity dynamics in an oscillatory flow over a rippled bed

  1991cited by this paper
• Sand ripples under sea waves Part 1. Ripple formation

  1990influential reference
• Measurements of Oscillatory Turbulent Boundary Layer Flow Above Ripples with a Laser-Doppler Velocimeter

  1987cited by this paper
• Oscillatory boundary layer flow and sand movement over ripples

  1987influential reference
• Numerical Simulation of the Oscillatory Boundary Layer Flow Over Ripples by a k—ε Turbulence Model

  1986cited by this paper
• Drag on naturally rippled beds under oscillatory flows

  1986cited by this paper
• Gravitational Settling of Aerosol Particles in Randomly Oriented Cellular Flow Fields

  1986cited by this paper
• Analytical determination of nearshore wave height variation due to refraction shoaling and friction

  1983influential reference
• Friction coefficients of rippled beds in oscillatory flow

  1982cited by this paper
• Oscillating flow over steep sand ripples

  1981cited by this paper
• Velocity measurements close to rippled beds in oscillatory flow

  1981cited by this paper
• Wave Entrainment of Sediment from Rippled Beds

  1977cited by this paper
• Vortex generation by oscillatory flow over rippled surfaces

  1975cited by this paper
• Some measurements of particle velocity autocorrelation functions in a turbulent flow

  1971cited by this paper
• Mass transport in water waves

  1953cited by this paper
• Motion of waves in shallow water. Interaction between waves and sand bottoms

  1946cited by this paper
• Bed forms generated in the laboratory under an oscillatory flow : analytical and experimental study

  1929influential reference
• The Origin and Growth of Ripple-Mark

  1910cited by this paper
• On the Formation of Ripple-Mark in Sand

  year unknowncited by this paper

• Influence of insoluble surfactants on the stability of film flow under quasiperiodic oscillation

  2026cites this paper
• Ripple-averaged wave boundary layer over long-crest sand ripples at high Reynolds number: Observations and theoretical model

  2025cites this paper
• Experiments and large eddy simulations of oscillatory flow over vortex ripples at high Reynolds number

  2025cites this paper
• On the Role of Ripple Secondary Crest on Nearbed Hydrodynamics

  2025cites this paper
• Linear stability analysis of a thin liquid film on a horizontal wall under quasi-periodic oscillation

  2025cites this paper
• Investigating wave shape effect on sediment transport over migrating ripples using an eulerian two-phase model

  2024cites this paper
• Vortex Trapping of Suspended Sand Grains Over Ripples

  2024cites this paper
• Selection of vortex ripple dimensions in sinusoidal oscillatory flows. Part 1. Ripple dimensions and fluid kinematics

  2023cites this paper
• Observations of net sediment transport rate and boundary layer of wave–current flows over vortex ripples

  2023cites this paper
• Efficient numerical model for sediment transport on vortex ripple bed in wave-induced oscillatory flow

  2023cites this paper
• Turbulence effect on the mechanics of ripple formation under regular wave

  2022cites this paper
• Mass Transfer in Magnetohydrodynamic Oscillatory Flow of Casson Liquid Through a Porous Horizontal Channel with Velocity Slip

  2022cites this paper
• Large Eddy Simulation of three‐dimensional flow structures over wave‐generated ripples

  2021cites this paper
• A Numerical Study of Onshore Ripple Migration Using a Eulerian Two‐phase Model

  2021cites this paper
• Improvement of the Full-Range Equation for Wave Boundary Layer Thickness

  2020cites this paper
• Modeling of net sediment transport rate due to wave-driven oscillatory flow over vortex ripples

  2020cites this paper