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Between a ripple and a dune


Bedforms in deserts include both small ripples and sand dunes that can reach tens to hundreds of metres in length — with seemingly little in between. It now looks as though intermediate-sized megaripples do appear if the conditions are just right.

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Fig. 1: Megaripples may form the missing link between bedform ripples and sand dunes.


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Correspondence to N. M. Vriend.

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Vriend, N.M., Jarvis, P.A. Between a ripple and a dune. Nature Phys 14, 641–642 (2018).

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