Erosion waves: transverse instabilities and fingering

Details Erosion waves: transverse instabilities and fingering Erosion waves: transverse instabilities and fingering

2005-07-07

arxiv.org/abs/cond-mat/0507163v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 6 figures, submitted to PRL

Scientific paper

10.1209/epl/i2006-10174-9

Two laboratory scale experiments of dry and under-water 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 reveals a common scenario for an erosion/deposition process.

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