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Estimation of the friction coefficient induced by marine dune using high resolution bathymetric data
Huybrechts, N.; Smaoui, H.; Le Bot, S.; Ouahsine, A.; Ferret, Y.; Lafite, R. (2013). Estimation of the friction coefficient induced by marine dune using high resolution bathymetric data, in: Van Lancker, V. et al. (Ed.) MARID 2013: Fourth International Conference on Marine and River Dune Dynamics. Bruges, Belgium, 15-17 April 2013. VLIZ Special Publication, 65: pp. 139-140
In: Van Lancker, V.; Garlan, T. (Ed.) (2013). MARID 2013: Fourth International Conference on Marine and River Dune Dynamics. Bruges, Belgium, 15-17 April 2013. VLIZ Special Publication, 65. Royal Belgian Institute of Natural Sciences/SHOM/Flanders Marine Institute (VLIZ): Oostende. ISBN 978-2-11-128352-7. 338 pp., meer
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, meer
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  • Huybrechts, N.
  • Smaoui, H.
  • Le Bot, S., meer
  • Ouahsine, A.
  • Ferret, Y.
  • Lafite, R.
Abstract
    The Somme estuary, located in France in the eastern English Channel, endures a severe sedimentation with an increase of the mean bed level about 1.3 cm/year. The sedimentation is probably induced by the asymmetry of the tidal current and the associated residual sediment flux between the flood and the ebb. This phenomenon is probably increased by different hydraulic structures built during the last centuries to domesticate the tide or river dynamics and to gain farmland. More recently, new hydraulic structures have been planned to limit the sedimentation, such as flush operation from the Somme channel or an experimental realignment project. To predict the bed morphology evolution and the influence of these hydraulic works, it is necessary to estimate the sedimentation rate feeding the bay from offshore. Field surveys (MOSAG07 and MOSAG08 on RV Thalia) conducted offshore, about 30 km away from the mouth in South West direction (Ferret et al., 2010), lighten the presence of marine dunes ranging from 100 m to 1800 m in wavelength.
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