Importance of second-order wave generation for focused wave group run-up and overtopping

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

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Abstract

Focused wave groups o er a means for coastal engineers to determine extreme run-up and overtopping events. Numerical predictions and laboratory measurements are presented of NewWave-type focused wave groups generated by a pistontype paddle generator, and interacting with a plane beach and a seawall in a wave basin. The numerical wave tank is based on the Boussinesq equations for non-breaking waves, and the non-linear shallow water equations for broken waves. Good agreement is achieved between the numerical predictions and laboratory measurements of free surface elevation,run-up distances and overtopping volumes for the test cases driven by linear paddle signals. Errors in run-up distance and overtopping volume are then assessed by repeating the test cases using second-order accurate wave generation signals. Focused wave groups generated using rst-order wave-maker theory are found to be substantially contaminated by a preceding long error wave, resulting in erroneously enhanced run-up distances and overtopping volumes. The use of second-order wave-maker theory for wave group run-up and overtopping experiments is instead recommended.

Item Type: Article
Subjects: Coasts > Overtopping
Coasts > General
Divisions: Coastal
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:50
Last Modified: 19 May 2020 12:51
URI: http://eprints.hrwallingford.com/id/eprint/973

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