Rhomboid beach pattern: A laboratory investigation

Abstract : The formation of beach rhomboid pattern by swash is investigated experimentally. This centimeter‐scale structure is classically interpreted as the mark of stationary gravity waves generated by obstacles in supercritical flows. However, thanks to the use of water‐based fluids of various viscosity, our experiments show that a rhomboid pattern can develop in subcritical flows. Its angle is primarily a function of the Froude number, as suggested by Woodford (1935), but our data do not support his classical model, nor do they support any of the existing theories. The slowness of the rhombus motion indicates that it is not simply the mark of a hydraulic phenomenon but rather results from the coupling between the water flow and sediment transport.
Document type :
Journal articles
Complete list of metadatas

Cited literature [31 references]  Display  Hide  Download

https://hal-univ-diderot.archives-ouvertes.fr/hal-01499465
Contributor : François Métivier <>
Submitted on : Friday, March 31, 2017 - 2:39:52 PM
Last modification on : Friday, July 26, 2019 - 1:26:04 PM
Long-term archiving on : Saturday, July 1, 2017 - 1:30:14 PM

File

jgrf692.pdf
Publisher files allowed on an open archive

Identifiers

Citation

O Devauchelle, L Malverti, É Lajeunesse, Christophe Josserand, Pierre-Yves Lagrée, et al.. Rhomboid beach pattern: A laboratory investigation. Journal of Geophysical Research: Earth Surface, American Geophysical Union/Wiley, 2010, 115 (F2), pp.F02017. ⟨10.1029/2009JF001471⟩. ⟨hal-01499465⟩

Share

Metrics

Record views

168

Files downloads

416