Europhys. Lett.
Volume 71, Number 3, August 2005
Page(s) 400 - 406
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 06 July 2005
Europhys. Lett., 71 (3), pp. 400-406 (2005)
DOI: 10.1209/epl/i2004-10543-4

Impact of drops on a water-covered sand bed: Erosion, entrainement and pattern formation

H. Kellay

Centre de Physique Moléculaire Optique et Hetrzienne, UMR 5798 351 cours de la Libération, 33405 Talence, France

received 15 September 2004; accepted in final form 31 May 2005
published online 6 July 2005

The impact of small drops on a water-covered sand bed provides a simple physical system to study erosion, sand entrainement and pattern formation. The patterns evidenced here start out nicely circular but this circular symmetry gets lost once the dropping frequency increases above threshold. Three-dimensional structures then form and grow logarithmically in time.

45.70.-n - Granular systems.
47.54.+r - Pattern selection; pattern formation.
47.55.Kf - Multiphase and particle-laden flows.

© EDP Sciences 2005