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 language | English |
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| Title of host publication | River, Coastal and Estuarine Morphodynamics |
| Subtitle of host publication | RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics |
| Pages | 657-665 |
| Number of pages | 9 |
| Publication status | Published - 1 Dec 2008 |
| Event | 5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007 - Unitersity of Twente, Enschede, Netherlands Duration: 17 Sep 2007 → 21 Sep 2007 Conference number: 5 |
Conference
| Conference | 5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007 |
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| Abbreviated title | RCEM |
| Country | Netherlands |
| City | Enschede |
| Period | 17/09/07 → 21/09/07 |