Reading: Combined Wave and Current Flow Close to a Rippled Bed


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Combined Wave and Current Flow Close to a Rippled Bed


Janaka J. Wijetunge

University of Peradeniya, LK
About Janaka J.

Senior Lecturer in Civil Engineering at the Department of Civil Engineering

BSc. Eng. Hons., PhD. (Cambridge), AMIE (SL)

specialised in Coastal Hydraulics at Cambridge University and his current research interests include wave-current and wave-structure interactions in shallow coastal waters

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This paper describes an experimental study carried out in a laboratory water tunnel to examine the velocity distribution in combined wave and current flow close to a rippled bed. The fluid velocities, both the horizontal and the vertical components, were measured simultaneously with a laser Doppler anemometer. The measurements indicate that the addition of a steady current causes a significant effect on the near-bed ensemble velocity field of the wave motion, owing primarily to the asymmetry of the lee-vortices that are formed during each half cycle of oscillation. On the other hand, the effect of adding a wave on the time-mean velocity field of a steady current is also significant in that the current experiences an enhanced roughness due to the additional turbulence produced by the wave motion.
How to Cite: Wijetunge, J.J., 2005. Combined Wave and Current Flow Close to a Rippled Bed. Engineer: Journal of the Institution of Engineers, Sri Lanka, 38(1), pp.16–24. DOI:
Published on 28 Jan 2005.
Peer Reviewed


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