FOCUSING UNIDIRECTIONAL WAVE GROUPS ON FINITE WATER DEPTH WITH AND WITHOUT CURRENTS
ICCE 2014 Cover Image
PDF

Keywords

focused waves
extreme waves
waves on currents.

How to Cite

Stagonas, D., Buldakov, E., & Simons, R. (2014). FOCUSING UNIDIRECTIONAL WAVE GROUPS ON FINITE WATER DEPTH WITH AND WITHOUT CURRENTS. Coastal Engineering Proceedings, 1(34), waves.31. https://doi.org/10.9753/icce.v34.waves.31

Abstract

Focused waves are often used in physical and numerical studies as a representative condition for extreme waves or as a mean to generate very steep and breaking waves at a desired location in space and time. A focused wave is in theory created when all the components in a transient wave group come in phase. In the past, linear wave theory and empirical iterative methodologies have been suggested in order to achieve the required phase and amplitude focusing. Nevertheless, their effectiveness decreases as the non-linearity of the wave group increases and thus the generation of very high focused waves was a challenging task. Here, an empirical iterative methodology is suggested which can focus waves of any height at a predetermined temporal and spatial location. The methodology has been successfully applied to wave groups travelling on still water but also on sheared currents and it has been implemented in both physical and numerical wave flumes. The results presented here refer to linear, weakly non-linear and strongly non-linear focused waves generated with a realistic target spectrum.
https://doi.org/10.9753/icce.v34.waves.31
PDF

References

Chaplin J.R. (1996). On frequency-focusing unidirectional waves. International Journal of Offshore and Polar Engineering, Vol. 6, No 2, 131-137.

Fernández H., Sriramb V., Schimmels S. and Oumeraci H. (2014) Extreme wave generation using self-correcting method - Revisited, Coastal Engineering 93 (2014) 15-31.

Orszaghova J., Taylor P.H., Borthwick A.G.I. and Raby A.C. (2014). Importance of second-order wave generation for focused wave group run-up and overtopping. Coastal Engineering 94, 63-79.

Rapp R.J. and Melville W.K. (1990). Laboratory measurements of deep water breaking waves. Philos. Trans. R. Soc. London. Ser A 331, 735-800.

Schmittner C., Kosleck S., Henning J. (2009) A phase-amplitude iteration scheme for the optimization of deterministic wave sequences Proceedings of the 28th International Conference on Offshore Mechanics and Artic Engineering.

Shemer L., Goulitski K. and Kit E. (2007). Evolution of wide-spectrum unidirectional wave groups in a tank: an experimental and numerical study. European Journal of Mechanics B/Fluids, Vol. 26, 193-219.

Yao A. and Wu C.H. (2005). Incipient breaking of unsteady waves on sheared currents. Physics of Fluids, Vol. 17, 082104-1 - 082104-10.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.