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The dynamics of bedform amalgamation: new insights from a very thin flume
Best, J.; Blois, G.; Barros, J.; Christensen, K. (2013). The dynamics of bedform amalgamation: new insights from a very thin flume, 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. 29-34
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., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

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Keyword
    Marine

Authors  Top 
  • Best, J.
  • Blois, G.
  • Barros, J.
  • Christensen, K.

Abstract
    Bedform superimposition and amalgamation are ubiquitous in many sedimentary environments and yet we possess a sparse knowledge of the fluid dynamics of such bedform interactions and both their sediment transport and morphological consequences. In this paper, we report on results concerning the morphology and flow fields of amalgamating mobile bedforms using a unique, narrow (5 mm wide) flume, which allows the behavior of strictly two-dimensional bedforms to be observed and quantified. Measurement of the morphology and flow fields associated with bedform amalgamation reveals the importance of interactions between the separation zones of the upstream and downstream bedforms, with flow sheltering, shear layer interactions, bedform stalling and leeside erosion being central to the amalgamation process. These fluid dynamic patterns reveal a distinct sequence of stages during bedform superimposition and amalgamation, which leave a characteristic record in the preserved sedimentary cross-strata.

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