Rhomboid beach pattern: A laboratory investigation | Zendy

Devauchelle O. | Zendy; Malverti L. | Zendy; Lajeunesse É. | Zendy; Josserand C. | Zendy; Lagrée P.Y. | Zendy; Métivier F. | Zendy

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Rhomboid beach pattern: A laboratory investigation

Author(s) -

Devauchelle O.,

Malverti L.,

Lajeunesse É.,

Josserand C.,

Lagrée P.Y.,

Métivier F.

Publication year - 2010

Publication title -

journal of geophysical research: earth surface

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/2009jf001471

Subject(s) - froude number , swash , rhomboid , geology , slowness , hydraulic jump , rhombus , flow (mathematics) , mechanics , geometry , physics , geomorphology , enzyme , proteases , mathematics , nuclear magnetic resonance , seismology

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.

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