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dc.contributor.authorLi, Yan
dc.contributor.authorDraycott, Samuel
dc.contributor.authorAdcock, Thomas A.A.
dc.contributor.authorvan den Bremer, Ton S.
dc.date.accessioned2021-03-22T10:15:06Z
dc.date.available2021-03-22T10:15:06Z
dc.date.created2021-02-21T13:08:35Z
dc.date.issued2021
dc.identifier.issn0022-1120
dc.identifier.urihttps://hdl.handle.net/11250/2734757
dc.description.abstractSurface gravity wavepackets in intermediate water depth experiencing an abrupt depth decrease are investigated experimentally. The experiments provide validation for the second-order (in steepness) theory for narrow-banded surface gravity wavepackets experiencing a sudden depth transition derived in a companion paper (Li et al., J. Fluid Mech., 2021, 915, A71). We observe the generation of free second-order sub- and superharmonic wavepackets due to the sudden depth transition, in addition to changes to the main (first-order) wavepacket and its second-order bound waves. Locally, just after the step, this leads to the superposition of different wavepacket components. Thereafter, separation occurs because of the different group speeds of the free second-order sub- and superharmonic wavepackets compared with the main packet. Experiments show that the local superposition of waves can lead to significant amplification of wave crests near the top of a step, as predicted by theory. In addition to a step, we also experimentally examine more gradual depth changes in the form of 1 : 1 and 1 : 3 slopes to explore the limits of the theory's validity. Although we find small differences in amplitude and phase comparing these steep slopes with a step, these experiments suggest that the theoretical model derived in Part 1 for wavepackets travelling over a step is applicable to slopes steeper than 1:3.en_US
dc.language.isoengen_US
dc.publisherCambridge University Pressen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleSurface wavepackets subject to an abrupt depth change. Part 2. Experimental analysisen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.journalJournal of Fluid Mechanicsen_US
dc.identifier.doi10.1017/jfm.2021.49
dc.identifier.cristin1892089
dc.description.localcode© 2020. This is the authors’ accepted and refereed manuscript to the article. Locked until 19.9.2021 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en_US
cristin.ispublishedfalse
cristin.fulltextpreprint
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