Undular bore development over a laboratory fringing reef

Undular bore development over a laboratory fringing reef

Tissier, M.F.S. (TU Delft Environmental Fluid Mechanics)
Dekkers, Jochem (Student TU Delft)
Reniers, A.J.H.M. (TU Delft Environmental Fluid Mechanics)
Pearson, S.G. (TU Delft Coastal Engineering)
van Dongeren, Ap (Deltares)

Lynett, Patrick (editor)

2018

Several studies have reported the development of undular bores over fringing coral reefs (e.g, Gallagher, 1976; Nwogu and Demirbilek, 2010) but the importance of this phenomenon for reef hydrodynamics has never been studied. Yet, the transformation of a long wave (e.g., swell or infragravity wave) into an undular bore leads to significant modifications of the wave field. The formation of undulations is for example associated to a significant increase of the leading bore height. Moreover, if the undulations have enough time to develop (i.e. if the reef flat is wide enough), the initial long wave will ultimately split into a series of solitons (e.g., Grue et al., 2008). All this is likely to affect wave run-up. As reeffronted coastlines are particularly vulnerable to flooding, a good understanding of long wave transformation over the reef flat, including their possible transformation into undular bores, is crucial. In this study, we investigate undular bore development over reef-type profiles based on a series of laboratory experiments. More specifically, we aim to characterize the conditions under which undular bores develop, and analyse how their development affect the hydrodynamics at the toe of the reef-lined beach and the resulting wave run-up.

http://resolver.tudelft.nl/uuid:5694cf70-686d-432e-ba58-1e719624b604

https://doi.org/10.9753/icce.v36.currents.53

Coastal Engineering Research Council

978-0-9896611-4-0

Proceedings of 36th Conference on Coastal Engineering, Baltimore, Maryland, 2018, 36 (2018)

36th International Conference on Coastal Engineering, ICCE 2018, 2018-07-30 → 2018-08-03, Baltimore Mariott Waterfront Hotel, 700 Aliceanna Street, Baltimore, MD 21202, Baltimore, United States

Proceedings of the Coastal Engineering Conference, 0161-3782

Institutional Repository

conference paper

© 2018 M.F.S. Tissier, Jochem Dekkers, A.J.H.M. Reniers, S.G. Pearson, Ap van Dongeren