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Modeling dune dynamics in situations with bimodal sediment distributions
Knaapen, M.A.F.; Willis, J.; Harris, J.H. (2013). Modeling dune dynamics in situations with bimodal sediment distributions, 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. 153-158
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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  • Knaapen, M.A.F., meer
  • Willis, J.
  • Harris, J.H.

Abstract
    Despite the significant progress that has been made in modeling dune dynamics in the marine environment in situations with abundance of movable sand, little progress has taken place in the understanding of dune dynamics in areas of mixed sediment including sand and gravel mixtures. In large parts of the North Sea, sand is transported as migrating dunes over a bed consisting of gravel. This paper presents some initial results from a multi-grain model using a Cellular Automaton type model based on the work of Bishop et al. (2008). The sediment is represented as unit slabs And the movement of these slabs within the model is based on a stochastic set of rules based on the flow and the gradient of the bed sediment. Transport takes place over a given distance that is also dependent on the local bed gradients. As part of this movement the model checks to see if the sediment bed slope exceeds a critical value, and if this value is exceeded avalanching occurs.

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