Bedforms in a turbulent stream . Part 2 : Formation of ripples by primary linear instability and of dunes by non-linear pattern coarsening

@inproceedings{Claudin2008BedformsIA,
  title={Bedforms in a turbulent stream . Part 2 : Formation of ripples by primary linear instability and of dunes by non-linear pattern coarsening},
  author={P. Claudin},
  year={2008}
}
It is widely accepted that both ripples and dunes form in rivers by primary linear instability, the wavelength of the former scaling on the grain size, that of the latter being controled by the water depth. We revisit here this problem, using the computation of the turbulent flow over a wavy bottom performed in Part 1. A multi-scale description of the problem is proposed, in which the details of the different mechanisms controlling sediment transport are encoded into three quantities: the… CONTINUE READING

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