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A laboratory ‘roundabout’ helps scientists to determine the types of barrier that can halt an underwater dune’s travels.

Experimental sand dune set-up

Piles of glass beads simulate underwater sediment in an experiment on dune migration and what can stop it. Credit: Karol Bacik, Nathalie Vriend/University of Cambridge

Line in the sand: the physics of halting a dune on the march 1

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