Morphodynamics of Sand Ridges on the Shelf: Modelling Effects of Waves, Wind and Tide

Nnafie, A.; de Swart, H.; Verwaest, T.

doi:/10.1007/978-3-032-15477-4_41

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Morphodynamics of Sand Ridges on the Shelf: Modelling Effects of Waves, Wind and Tide

Nnafie, A.; de Swart, H.; Verwaest, T. (2026). Morphodynamics of Sand Ridges on the Shelf: Modelling Effects of Waves, Wind and Tide, in: Coelho, C. et al.

Coastal Dynamics 2025: Conference proceedings. Coastal Research Library, 42: pp. 265-271. https://dx.doi.org/10.1007/978-3-032-15477-4_41

In: Coelho, C. et al. (2026).

Coastal Dynamics 2025: Conference proceedings. Coastal Research Library, 42. Springer: Cham. Vol.1 ( XXII, 828); Vol 2 (XX, 729) pp. https://dx.doi.org/10.1007/978-3-032-15477-4

In: Coastal Research Library. Springer: Cham. ISSN 2211-0577; e-ISSN 2211-0585

Available in	Authors
Waterbouwkundig Laboratorium: Open Repository 420058 [ OWA ]
Document type: Conference paper

Keywords

Motion > Tidal motion > Tides
Waves (water)
Winds
Brackish water

Author keywords

Sfcr; tsr

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MOZES: onderzoek van de morfologische interactie tussen de kustnabije banken en geulen en de strandzone

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Nnafie, A. de Swart, H. Verwaest, T., more

Abstract

Shoreface-connected sand ridges (sfcr) and tidal sand ridges (tsr) are large-scale rhythmic bedforms found on many sandy continental shelves. Previ-ous studies have not addressed the combined impact of waves, wind and tides on the evolution of these ridges. Furthermore, they were unable to simulate sfcr with wave-topography feedbacks. The objectives of this study are to 1) simu-late sfcr in the presence of these feedbacks; and 2) to quantify the combined impact of waves, wind and tide on the evolution of shelf ridges. To this end, a morphodynamic shelf model (Delft3D + SWAN) is used in a setting representa-tive of the Belgian shelf. The model successfully simulates sfcr in the presence of wave-topography feedbacks, producing ridges with characteristics consistent with observations. Regarding 2), a mix of two types of ridges develops on the shelf, which resemble the sfcr and tsr observed on the Belgian shelf. However, a notable difference is that observed tsr are located further offshore than modelled ridges.

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