Erosion waves: Transverse instabilities and fingering

Two 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...

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Bibliographic Details
Published in:Europhysics letters 2006-09, Vol.75 (5), p.825-831
Main Authors: Malloggi, F, Lanuza, J, Andreotti, B, Clément, E
Format: Article
Language:English
Subjects:
83.50.Lh
83.80.Fg
92.40.Gc
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Summary:Two 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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2006-10174-9