Quasi-three-dimensional modelling of the morphology of longshore bars

Publication: Research - peer-reviewJournal article – Annual report year: 2007

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A morphological quasi-three-dimensional (Q3D) area model for bar-red coasts has been developed. The model combines a two-dimensional depth integrated model for wave-driven currents with a model for under-tow circulation currents. The combined model makes a simultaneous simulation of the bar-forming processes associated with the undertow and the horizontal wave-driven circulation currents, which may cause instabilities of the bar and the formation of rip channels. Situations with normal and oblique wave incidence are considered. Compared to the depth integrated approach the Q3D model produces less pronounced alongshore irregularities for obliquely incident waves. For normal incident waves the Q3D model produces a crescentic bar while the depth integrated model predicts almost straight sections of the bar interrupted by rip channels. The sensitivity to variation of wave angle and beach slope is further investigated.
Original languageEnglish
JournalCoastal Engineering
Publication date2007
Volume54
Issue3
Pages197-215
ISSN0378-3839
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 28

Keywords

  • undertow, coastal morphology, crescentic bars, rip channels, sediment transport, quasi-three-dimensional model, longshore current, wave-driven currents, barred beach, surf zone
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