Unravelling raked linear dunes to explain the coexistence of bedforms in complex dunefields

Ping Lü (), Clément Narteau (), Zhibao Dong, Olivier Rozier and Sylvain Courrech du Pont
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Ping Lü: Shaanxi Normal University
Clément Narteau: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS
Zhibao Dong: Shaanxi Normal University
Olivier Rozier: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS
Sylvain Courrech du Pont: Laboratoire Matière et Systèmes Complexes, Sorbonne Paris Cité, Université Paris Diderot, UMR 7057 CNRS, Bâtiment Condorcet

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Raked linear dunes keep a constant orientation for considerable distances with a marked asymmetry between a periodic pattern of semi-crescentic structures on one side and a continuous slope on the other. Here we show that this shape is associated with a steady-state dune type arising from the coexistence of two dune growth mechanisms. Primary ridges elongate in the direction of the resultant sand flux. Semi-crescentic structures result from the development of superimposed dunes growing perpendicularly to the maximum gross bedform-normal transport. In the particular case of raked linear dunes, these two mechanisms produces primary and secondary ridges with similar height but with different orientations, which are oblique to each other. The raked pattern develops preferentially on the leeward side of the primary ridges according to the direction of propagation of the superimposed bedforms. As shown by numerical modelling, raked linear dunes occur where both these oblique orientations and dynamics are met.

Date: 2017
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DOI: 10.1038/ncomms14239

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