Final published version
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - Velocity moments around detached breakwaters
AU - Ilic, Suzana
AU - Chadwick, Andrew J.
PY - 2003/1/1
Y1 - 2003/1/1
N2 - 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.
AB - 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.
U2 - 10.1142/9789812791306_0141
DO - 10.1142/9789812791306_0141
M3 - Conference contribution/Paper
AN - SCOPUS:84950152775
T3 - Proceedings of the Coastal Engineering Conference
SP - 1671
EP - 1683
BT - Proceedings of the 28th International Conference on Coastal Engineering 2002
A2 - Smith, Jane McKee
PB - American Society of Civil Engineers (ASCE)
T2 - 28th International Conference on Coastal Engineering, ICCE 2002
Y2 - 7 July 2002 through 12 July 2002
ER -