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An idealised study for the long term evolution of crescentic bars

Chen, W.L.; Dodd, N.; Tiessen, M.C.H.; Calvete, D.

Authors

W.L. Chen

NICHOLAS DODD NICHOLAS.DODD@NOTTINGHAM.AC.UK
Professor of Coastal Dynamics

M.C.H. Tiessen

D. Calvete



Abstract

An idealised study that identifies the mechanisms in the long term evolution of crescentic bar systems in nature is presented. Growth to finite amplitude (i.e., equilibration, sometimes referred to as saturation) and higher harmonic interaction are hypothesised to be the leading nonlinear effects in long-term evolution of these systems. These nonlinear effects are added to a linear stability model and used to predict crescentic bar development along a beach in Duck, North Carolina (USA) over a 2-month period. The equilibration prolongs the development of bed patterns, thus allowing the long term evolution. Higher harmonic interaction enables the amplitude to be transferred from longer to shorter lengthscales, which leads to the dominance of shorter lengthscales in latter post-storm stages, as observed at Duck. The comparison with observations indicates the importance of higher harmonic interaction in the development of nearshore crescentic bar systems in nature. Additionally, it is concluded that these nonlinear effects should be included in models simulating the development of different bed patterns, and that this points a way forward for long-term morphodynamical modelling in general.

Citation

Chen, W., Dodd, N., Tiessen, M., & Calvete, D. (in press). An idealised study for the long term evolution of crescentic bars. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.11.006

Journal Article Type Article
Acceptance Date Nov 19, 2017
Online Publication Date Nov 22, 2017
Deposit Date Nov 30, 2017
Publicly Available Date Mar 29, 2024
Journal Continental Shelf Research
Print ISSN 0278-4343
Electronic ISSN 0278-4343
Publisher Elsevier
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1016/j.csr.2017.11.006
Public URL https://nottingham-repository.worktribe.com/output/896214
Publisher URL https://www.sciencedirect.com/science/article/pii/S0278434317302200

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