c/o Geological Survey of India, Calcutta, India.
Diffusion of sediment on the lee of dune-like bedforms: theoretical and numerical analysis
Article first published online: 14 JUN 2006
Volume 28, Issue 4, pages 531–545, August 1981
How to Cite
CHAKRABARTI, C. and LOWE, D. R. (1981), Diffusion of sediment on the lee of dune-like bedforms: theoretical and numerical analysis. Sedimentology, 28: 531–545. doi: 10.1111/j.1365-3091.1981.tb01700.x
- Issue published online: 14 JUN 2006
- Article first published online: 14 JUN 2006
- Manuscript received 11 February 1980; revision received 30 September 1980
Theoretical and empirical analyses of flow structure, sediment transport, and sediment size characteristics at the crest of dune-like bedforms indicate that it is possible to describe, at least semi-quantitatively, the diffusion and deposition of sediment on the leeside of such structures. A numerical program based on this analysis simulates the grain-size distribution and deposition rate on the leeside of dunes for specified flow conditions and bed material. Evaluation of flow and sediment variables through the numerical simulation program shows that flow velocity, flow depth and sediment size have a strong influence on the deposition rate and texture of leeside sediment before avalanching. Sorting of the bed material, in particular, appears to exert a strong control on both the grain-size and the deposition-rate gradients.