F. Malloggi et al 2006 Europhys. Lett. 75 825 doi:10.1209/epl/i2006-10174-9
F. Malloggi, J. Lanuza, B. Andreotti and E. Clément
Show affiliationsTwo laboratory scale experiments of dry and underwater avalanches of non-cohesive granular materials are investigated. We trigger solitary waves and study the conditions under which the front is transversally stable. We show the existence of a linear instability followed by a coarsening dynamics and finally the onset of a fingering pattern. Due to the different operating conditions, both experiments strongly differ by the spatial and time scales involved. Nevertheless, the quantitative agreement between the stability diagram, the wavelengths selected and the avalanche morphology suggest a common scenario for an erosion/deposition process.
92.40.Gc Erosion and sedimentation
83.50.Lh Slip boundary effects (interfacial and free surface flows)
Issue 5 (September 2006)
Received 6 March 2006, accepted for publication 13 July 2006, in final form 13 July 2006
Published 28 July 2006
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