Chapter
Dec 31, 2015
Oscillatory Flow Behavior in the Vicinity of Ripple Models
Authors: Kiyoshi Horikawa, F.ASCE, and Suguru MizutaniAuthor Affiliations
Publication: Coastal Engineering 1992
Abstract
In the previous paper, a fixed ripple model with a sharp crest was used to investigate the characteristics of oscillatory flow in the vicinity of wavy boundary. The above ripple model is useful to proof the adaptability of the analytical treatment presented by Longuet-Higgins (1981) and to extend our knowledge on the present subject. However the stated model is too simple to represent the real shape of sand ripples appeared on the sea bottom. From such a view point, in the present study another fixed ripple model with a round crest was selected. This model has the shape almost similar to the previous one except in the vicinity of the crest.
A two-dimensional LDV was used to measure the flow velocity at preset grid points. By using these velocity data the vorticity at each grid point was calculated and the equivorticity lines were drawn for the sharp crest ripple as well as the round crest ripple at various phases of oscillatory flow. Then the circulation outside the vortex was evaluated. Based on the available data the temporal variation of the circulation was discussed quantitatively. Finally criteria of vortex formation were introduced and the physical meaning of these criteria was discussed.
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Published In
Coastal Engineering 1992
Pages: 2122 - 2135
Copyright
© 1993 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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ASCE Technical Topics:
- Coastal engineering
- Coastal processes
- Coasts, oceans, ports, and waterways engineering
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering mechanics
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Hydrologic engineering
- Motion (dynamics)
- Oscillations
- Oscillatory flow
- River engineering
- Sediment
- Sediment transport
- Solid mechanics
- Water and water resources
Authors
Affiliations
Kiyoshi Horikawa, F.ASCE
President, Saitama University, 255 Shimo-Okubo, Urawa, Saitama 338, Japan.
Suguru Mizutani
Postgraduate, Department of Foundation Engineering, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Urawa, Saitama 338, Japan.
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