Researchers found sand dunes interact and repel one another to move across the landscape.
Now researchers from the University of Cambridge, U.K., have carried out laboratory experiments to show how dunes interact.
The two dunes started out close together but over time they moved further apart. The swirls from the upstream dune appeared to repel the downstream dune. Because both dunes were the same height, the team thought they would move at the same speed, but this was not the case. The front dune initially moved faster before slowing down so they were both moving at the same speed. Once they reached a certain distance, they appeared to form an equilibrium on opposite sides of the racetrack.
He said that large dunes in a desert evolve over decades or centuries. Their findings suggest that repulsion preventing the collisions of dunes may make the landscape more stable and robust, but more research will be needed to confirm this through satellite observations.
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