Influence of grain size on sandbanks dynamics

D. Idier*, H. H. Van Der Veen, S. J.M.H. Hulscher

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

The grain size distribution over sandbanks is far from uniform, and ranges from fine sand to gravel. Using stability analysis, we investigate the relative influence of the grain size dependent parameters on the sandbanks dynamics. Two models are developed and used: (1) the 3D stability analysis of Hulscher (1996) taking into account the transport threshold, (2) a 2DH stability analysis designed for sandbanks and taking into account most of the grain size dependencies.The first model is used to predict sandbanks occurrence in the North Sea and their geometrical characteristics. The comparison with observed sandbanks shows that the inclusion of critical shear stress improves the results. With the second model, we investigate the relative influence of the grain size dependent parameters on the sandbanks dynamics, especially the sandbanks morphological time and wavelength. The results show that neglecting the grainsize dependencies, especially the transport threshold, has a drastic influence on the sandbanks dynamics.

Original languageEnglish
Title of host publicationRiver, Coastal and Estuarine Morphodynamics
Subtitle of host publicationRCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Pages657-665
Number of pages9
Publication statusPublished - 1 Dec 2008
Event5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007 - Unitersity of Twente, Enschede, Netherlands
Duration: 17 Sep 200721 Sep 2007
Conference number: 5

Conference

Conference5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007
Abbreviated titleRCEM
CountryNetherlands
CityEnschede
Period17/09/0721/09/07

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