title: Granular size segregation in underwater sand ripples.
abstract: We report an experimental study of a binary sand bed under an oscillating water flow. The formation and evolution of ripples is observed. The appearance of a granular segregation is shown to strongly depend on the sand bed preparation. The initial wavelength of the mixture is measured. In the final steady state, a segregation in volume is observed instead of a segregation at the surface as reported before. The correlation between this phenomenon and the fluid flow is emphasised. Finally, different "exotic" patterns and their geophysical implications are presented.
authors.affiliation: Physique et Mécanique des Milieux Hétérogénes (PMMH), UMR CNRS-ESPCI 7636, 10 rue Vauquelin, 75231, Paris Cedex 05, France.
authors.forename: G
authors.initials: G
authors.lastname: Rousseaux
authors.forename: H
authors.initials: H
authors.lastname: Caps
authors.forename: J-E
authors.initials: JE
authors.lastname: Wesfreid
mesh_terms: D055593:Geological Phenomena; D005844:Geology; D009792:Oceans and Seas; D055585:Physical Phenomena; D010825:Physics; D012822:Silicon Dioxide; D013314:Stress, Mechanical; D013997:Time Factors; D014867:Water
chemical_list: D014867:Water; D012822:Silicon Dioxide