Velocity moments around detached breakwaters

Ilic, Suzana and Chadwick, Andrew J. (2003) Velocity moments around detached breakwaters. In: Proceedings of the 28th International Conference on Coastal Engineering 2002. Proceedings of the Coastal Engineering Conference . American Society of Civil Engineers (ASCE), GBR, pp. 1671-1683. ISBN 9812382380

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Abstract

The relative importance of the different velocity moments in sediment transport around detached breakwaters was investigated by using Bailard's (1981) formulae. Current velocities were measured during a laboratory experiment on shoreline evolution behind detached breakwaters, conducted in the UK Coastal Research Facility at HR Wallingford. Regular and irregular unidirectional waves were simulated. Normalised moments were calculated and compared to predictions from simple monochromatic and linear random wave models. A reasonable agreement between observed values for irregular waves and the predictions of a random linear wave model was found. Third and fourth order velocity moment terms from Bailard's formulae were decomposed into a number of velocity moments which predict bedload and suspended load rates related to the contribution of mean flow, short and long waves and their interaction. The contribution from short wave stirring and transport by mean flow was found to be dominant for regular and irregular waves. In the case of irregular waves this contribution was almost matched by contributions from stirring and transport by short waves and from stirring by short waves and transport by long waves. It is clear that the accurate prediction of velocity moment terms and related sediment transport requires the consideration of the contribution of mean flow, short and long waves and their interaction, and hence irregular waves.

Item Type:
Contribution in Book/Report/Proceedings
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1910
Subjects:
ID Code:
134340
Deposited By:
Deposited On:
22 Jun 2019 01:03
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Mar 2020 08:57