Abstract
Bed forms result from interactions between water and sediment, and are very diverse depending on flow and sediment conditions. They act as roughness to the flow leading to increasing water levels. In order to determine the water levels accurately, reliable predictions of bed form evolution and associated roughness are essential. Dunes are the most common bed forms in lowland river channels consisting of sand and gravel, generated by divergences and convergences of sediment over the bed. To be able to model dune evolution and dune dimensions adequately, knowledge on sediment transport processes is crucial. In this paper, preliminary results are presented of a study on the effects of suspended sediment transport on dune morphology and evolution. The dune evolution model of Paarlberg et al. (2007; 2009; 2010) is extended with an advection-diffusion equation for suspended sediment transport. The model results show that suspended sediment transport accelerates the evolution of dunes: dune heights and migration rates increase towards equilibrium. However, in equilibrium suspended sediment transport has a much smaller contribution in changing the morphology and evolution of dunes.
| Original language | English |
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| Title of host publication | Proceedings of the 7th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, 6-8 September 2011, Beijing, China |
| Editors | X. Shao, Z. Wang, G. Wang |
| Place of Publication | Beijing, China |
| Publisher | Tsinghua University Press |
| Pages | 1-9 |
| ISBN (Print) | 978-7-89444-548-3 |
| Publication status | Published - 6 Sept 2011 |
| Event | 7th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2011 - Tsinghua University, Beijing, China Duration: 6 Sept 2011 → 8 Sept 2011 Conference number: 7 |
Conference
| Conference | 7th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2011 |
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| Abbreviated title | RCEM |
| Country/Territory | China |
| City | Beijing |
| Period | 6/09/11 → 8/09/11 |