The wave plus current flow over vortex ripples at an arbitrary angle |
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| Authors: | Ken Haste Andersen Carla Faraci |
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| Institution: | a Department of Mechanical Engineering, Technical University of Denmark, Building 115, DK-2800 Kgs., Lyngby, Denmark;b Department of Civil and Environmental Engineering, University of Catania, v.le A. Doria 6, 95125, Catania, Italy |
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| Abstract: | This work concerns the wave plus current flow over a sand bed covered by vortex ripples, with the current and the waves coming from different angles. Experiments were performed in a basin, where current and waves were perpendicular, in order to determine the conditions (current strength) leading to a regular ripple pattern formation. Numerical simulations were conducted changing the direction between the waves and the current from 0° to 90° and the ratio between the current strength and the wave orbital velocity from 0.2 to 1.5. Close to the bed, the current aligns parallel to the ripple crests, leading to a veering current profile with the vertical coordinate. The current-related friction coefficient was calculated. It was found that it decreases as the angle approaches 90°, while it increases for decreasing values of the current with a trend that can be described by a power law. |
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| Keywords: | Wave Current Friction |
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