Abstract
The migration rates of both medium and very large dunes in a part of the North Sea were determined from high-resolution multi-beam echo soundings. From the bathymetric maps, crest positions were determined and compared. From changes in the positions of these crests relative to fixed markers, the migration rates within a tidal cycle and on a seasonal timescale were calculated. The sediment transport rates derived from the migration of the bedforms compare well with theoretical estimates of the residual transport in the area.
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Acknowledgements
Several people with the Directorate-General of Public Works and Water Management, North Sea Directorate, have been instrumental in data acquisition and data processing. In particular, we would like to thank S.L. Bicknese for co-ordinating the processing of multi-beam data and T. Krijthe for supervising data acquisition on board the RV Arca. This research project was part of Delft Cluster Theme 3, Coast and River, Eco-Morphodynamics of the Seafloor (project number 03.01.05). We also would like to thank project co-ordinator S. van Heteren (TNO\NITG) for his valuable comments.
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Knaapen, M.A.F., van Bergen Henegouw, C.N. & Hu, Y.Y. Quantifying bedform migration using multi-beam sonar. Geo-Mar Lett 25, 306–314 (2005). https://doi.org/10.1007/s00367-005-0005-z
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DOI: https://doi.org/10.1007/s00367-005-0005-z