Effectiveness of recurve walls in reducing wave overtopping on seawalls and breakwaters

Pearson, J. and Bruce, T. and Allsop, W. and Kortenhaus, A. and van der Meer, J. (2004) Effectiveness of recurve walls in reducing wave overtopping on seawalls and breakwaters. In: ICCE 2004 (29th International Conference on Coastal Engineering), 19-24 September 2004, Lisbon, Portugal.

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Official URL: http://www.worldscientific.com/doi/abs/10.1142/978...

Abstract

Designers of vertical seawalls and breakwaters have often included some form of seaward overhang (recurve / parapet / wave return wall / bullnose) as part of the structure with the design motivation of reducing wave overtopping by deflecting back seaward uprushing water. Despite a lengthy track record in the field and relevance to current design issues, very little generic guidance is available for their incorporation into seawall / breakwater design. This paper reports a study whose aim is the formulation of generic guidance for recurve structure design. Particular attention is given to high freeboard and / or wave breaking conditions under which the recurve / parapet gives very large reductions (recurve k-factor < 0.05). The paper presents tentative guidance in the form of a decision chart. Finally, overtopping and loading results from a case study into a wall of particularly complex geometry are presented and compared with earlier studies. Forces on the vertical wall are found to be highly impulsive in nature and approximately double the magnitude of those expected on a simple wall, with additional forces of a similar magnitude measured on the underside of the parapet.

Item Type: Conference or Workshop Item (Paper)
Subjects: Maritime > General
Coasts > Overtopping
Coasts > General
Divisions: Maritime
Coastal
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:46
Last Modified: 02 Apr 2020 09:46
URI: http://eprints.hrwallingford.com/id/eprint/536

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