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Oblique sand ridges in confined tidal channels due to Coriolis and frictional torques
Hepkema, T.M.; de Swart, H.E.; Nnafie, A.; Schramkowski, G.P.; Schuttelaars, H.M. (2020). Oblique sand ridges in confined tidal channels due to Coriolis and frictional torques. Ocean Dynamics 70(12): 1505-1513. https://dx.doi.org/10.1007/s10236-020-01413-0
In: Ocean Dynamics. Springer-Verlag: Berlin; Heidelberg; New York. ISSN 1616-7341; e-ISSN 1616-7228, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Author keywords
    Coriolis effect; Sediment transport; Linear stability analysis; Sandridges; Tidal bars; Residual circulation
Auteurs  Top 
  • Hepkema, T.M.
  • de Swart, H.E.
  • Nnafie, A., meer
  • Schramkowski, G.P., meer
  • Schuttelaars, H.M.
Abstract
    The role of the Coriolis effect in the initial formation of bottom patterns in a tidal channel is studied by means of a linear stability analysis. The key finding is that the mechanism generating oblique tidal sand ridges on the continental shelf is also present in confined tidal channels. As a result, the Coriolis effect causes the fastest growing pattern to be a combination of tidal bars and oblique tidal sand ridges. Similar as on the continental shelf, the Coriolis-induced torques cause anticyclonic residual circulations around the ridges, which lead to the accumulation of sand above the ridges. Furthermore, an asymptotic analysis indicates that the maximum growth rate of the bottom perturbation is slightly increased by the Coriolis effect, while its preferred wavelength is hardly influenced.
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