Wavelength selection of rolling-grain ripples in the laboratory.

  title={Wavelength selection of rolling-grain ripples in the laboratory.},
  author={Germain Rousseaux and Alexandre Stegner and J. E. Wesfreid},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={69 3 Pt 1},
We have performed an experimental study, at very high resolution, of the wavelength selection and the evolution of rolling-grain ripples. A clear distinction is made between the flat sand bed instability and the ripple coarsening. The observation of the initial wavelength for the rolling-grain ripples is only possible close to the threshold for movement which imposes a constraint on the parameters. Moreover, we have proposed a law for the selection of the unstable wavelength under the latter… CONTINUE READING


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