Print Email Facebook Twitter Implications of second-order wave generation for physical modelling of force and run-up on a vertical wall using wave groups Title Implications of second-order wave generation for physical modelling of force and run-up on a vertical wall using wave groups Author Mortimer, William (Plymouth University; JBA Consulting Ltd.) Calvert, R. (University of Oxford; University of Edinburgh) Antonini, A. (TU Delft Coastal Engineering) Greaves, Deborah (Plymouth University) Raby, Alison (Plymouth University) van den Bremer, T.S. (TU Delft Environmental Fluid Mechanics; University of Oxford) Date 2023 Abstract Experiments are contaminated by second-order error waves at sub- and super-harmonic frequencies when first-order wave generation is used. Herein, we investigate by experiment the implications of second-order wave generation theory for dynamic wave force and run-up on a vertical wall in shallow to intermediate water depth (k0d=0.5−1.1). Results of short-duration experiments using focused wave groups generated according to first- and second-order theory are compared. We isolate linear, sub-, and super-harmonic contributions using combinations of inverted wave group time series and filtering. We derive theoretical predictions for narrow-banded second-order wave groups interacting with a vertical wall and use this to calculate depth-integrated force and run-up on the wall, which show close agreement with measured data. Comparisons reveal that sub-harmonic error waves are increasingly important in shallow depth, increasing wave run-up by up to 67% and dynamic force by up to 75% at k0d=0.6 when compared to the case of correct (second-order) generation in a relatively short flume. Subject Bound long-wavesError wavesSecond-orderSet-downSpurious wavesWave forceWave generationWave run-up To reference this document use: http://resolver.tudelft.nl/uuid:a477d652-9749-4d5c-8e9c-bf7595e15210 DOI https://doi.org/10.1016/j.coastaleng.2022.104259 ISSN 0378-3839 Source Coastal Engineering, 180 Part of collection Institutional Repository Document type journal article Rights © 2023 William Mortimer, R. Calvert, A. Antonini, Deborah Greaves, Alison Raby, T.S. van den Bremer Files PDF 1_s2.0_S0378383922001727_main.pdf 5.62 MB Close viewer /islandora/object/uuid:a477d652-9749-4d5c-8e9c-bf7595e15210/datastream/OBJ/view