Hydrodynamics and sediment dynamics of North Sea sand waves and sand banks
Huntley, D.A.; Huthnance, J.M.; Collins, M.B.; Liu, C.-L.; Nicholls, R.J.; Hewitson, C. (1993). Hydrodynamics and sediment dynamics of North Sea sand waves and sand banks, in: Charnock, H. et al. Understanding the North Sea system: discussion held on 4 and 5 November 1992. pp. 83-96. https://dx.doi.org/10.1007/978-94-011-1236-9_7 In: Charnock, H. et al. (1993). Understanding the North Sea system: discussion held on 4 and 5 November 1992. Royal Society of London: London. ISBN 978-0-412-55480-3; e-ISBN 978-94-011-1236-9. XV, 222 pp. https://dx.doi.org/10.1007/978-94-011-1236-9, more |
| Keyword | | | Author keywords | drag coefficient; drag reduction; tidal flow; sand transport; sand wave |
| Authors | | Top | - Huntley, D.A.
- Huthnance, J.M.
- Collins, M.B.
| - Liu, C.-L.
- Nicholls, R.J.
- Hewitson, C.
| |
| Abstract | Seabed drag coefficients have been measured at a site within the Norfolk Banks and at a site within the sand wave field in the southern North Sea, using pressure sensors and moored current meters. At the sand banks site a seabed tripod measuring turbulent flows within 1 m of the bed was also used. The results are generally in agreement with values used in numerical models. At the sand banks site, the drag coefficient increases with wind conditions, but at the sand waves site there is a reduction during the highest wave conditions, attributed to the drag reduction caused by sand resuspension from the bed. This result suggests that sediment effects must be considered if wave/current interaction is included in numerical models of the region. The drag coefficient for reversing tidal flows over the asymmetric sand waves is found to be larger for flow towards the steeper face, suggesting a small form drag component. |
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