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dc.contributor.authorvan Maanen, Barend
dc.contributor.authorde Ruiter, P.J.
dc.contributor.authorCoco, Giovanni
dc.contributor.authorBryan, Karin R.
dc.contributor.authorRuessink, B.G.
dc.date.accessioned2013-11-29T01:12:44Z
dc.date.available2013-11-29T01:12:44Z
dc.date.copyright2008-08
dc.date.issued2008
dc.identifier.citationvan Maanen, B., de Ruiter, P. J., Coco, G., Bryan, K. R., & Ruessink, B. G. (2008). Onshore sandbar migration at Tairua Beach (New Zealand): Numerical simulations and field measurements. Marine Geology, 253(3-4), 99-106.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/8258
dc.description.abstractWe observed the onshore migration (3.5 m/day) of a nearshore sandbar at Tairua Beach, New Zealand during 4 days of low-energy wave conditions. The morphological observations, together with concurrent measurements of waves and suspended sediment concentrations, were used to test a coupled, wave-averaged, cross-shore model. Because of the coarse bed material and the relatively low-energy conditions, the contribution of the suspended transport to the total transport was predicted and observed to be negligible. The model predicted the bar to move onshore because of the feedback between near-bed wave skewness, bedload, and the sandbar under weakly to non-breaking conditions at high tide. The predicted bathymetric evolution contrasts, however, with the observations that the bar migrated onshore predominantly at low tide. Also, the model flattened the bar, while in the observations the sandbar retained its steep landward-facing flank. A comparison between available observations and numerical simulations suggests that onshore propagating surf zone bores in very shallow water (< 0.25 m) may have been responsible for most of the observed bar behaviour. These processes are missing from the applied model and, given that the observed conditions can be considered typical of very shallow sandbars, highlight a priority for further field study and model development. The possibility that the excess water transported by the bores across the bar was channelled alongshore to near-by rip-channels further implies that traditional cross-shore measures to judge the applicability of a cross-shore morphodynamic model may be misleading.en_NZ
dc.language.isoenen_NZ
dc.publisherElsevieren_NZ
dc.relation.ispartofMarine Geology
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0025322708001539en_NZ
dc.subjectnearshore sandbarsen_NZ
dc.subjectsediment transporten_NZ
dc.subjectonshore migrationen_NZ
dc.subjectsurf zone boresen_NZ
dc.subjectwave skewnessen_NZ
dc.titleOnshore sandbar migration at Tairua Beach (New Zealand): Numerical simulations and field measurementsen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1016/j.margeo.2008.05.007en_NZ
dc.relation.isPartOfMarine Geologyen_NZ
pubs.begin-page99en_NZ
pubs.elements-id33040
pubs.end-page106en_NZ
pubs.issue3-4en_NZ
pubs.volume253en_NZ


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