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

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

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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
ID Code:965
Deposited On:11 Nov 2014 08:17
Last Modified:04 Aug 2015 11:08

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