Individual violent wave-overtopping events: behaviour and estimation

Article


Raby, Alison, Jayaratne, R., Bredmose, Henrik and Bullock, Geoff 2019. Individual violent wave-overtopping events: behaviour and estimation. Journal of Hydraulic Research. 58 (1), pp. 34-46. https://doi.org/10.1080/00221686.2018.1555549
AuthorsRaby, Alison, Jayaratne, R., Bredmose, Henrik and Bullock, Geoff
Abstract

To better understand individual violent wave overtopping, of significance for coastal defence design, three breaking wave types (steep-fronted, plunging and broken) based on focused wave groups, were generated in laboratory and numerical models. High-speed video captured overtopping events and produced velocity vector maps by means of bubble image velocimetry (BIV). Results were compared with a numerical model based on a linear wave detection procedure and a two-phase incompressible Navier–Stokes-based solver. This novel approach revealed that the overtopping waves comprised an initial jet of 0.2 s duration, but dominated by quasi-steady flow. Whilst laboratory surface-elevation time-histories were highly repeatable, overtopping volume repeats were sensitive to the breaker type. Measured volumes were compared with: the numerical model (which over-predicted, but was reasonably accurate for steep-fronted waves); estimations based on BIV results (which provided very close agreement for the steep-fronted waves); and a weir-based analogy (which provided reasonable agreement, but always under-predicted).

JournalJournal of Hydraulic Research
Journal citation58 (1), pp. 34-46
ISSN0022-1686
Year2019
PublisherTaylor & Francis for International Association for Hydro-Environment Engineering and Research (IAHR)
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Digital Object Identifier (DOI)https://doi.org/10.1080/00221686.2018.1555549
Web address (URL)https://doi.org/10.1080/00221686.2018.1555549
Publication dates
Online21 Jan 2019
Publication process dates
Deposited11 Feb 2019
Accepted30 Nov 2018
Accepted30 Nov 2018
FunderEngineering and Physical Sciences Research Council
Engineering and Physical Sciences Research Council
Engineering and Physical Sciences Research Council
Copyright holder© 2019 The Authors
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