sand avalanche

sand avalanche

[′sand ‚av·ə‚lanch]
(geology)
Movement of large masses of sand down a dune face when the angle of repose is exceeded or when the dune is disturbed.
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I once started a sand avalanche at the top of a dune, and the conditions were just right--it was like melted chocolate flowing down a hill in slow motion," says Woolsey.
Our approach will also shed light on sand avalanches in oil extraction, on aspects of folding in living matter, and on electromechanical instabilities.
Captain Ali Al Qusaib who managed the rescue said that the rescue attempt was difficult despite the tricky nature of sand avalanches.
After storms patches of dark sand are often visible on contemporary dune surfaces and have been observed in places where sand avalanches are unlikely or impossible.
The sound originates when sand avalanches down the lee face of a dune, explains Hunt.
One towering dune emits a loud thrumming roar as we set small sand avalanches in motion by sliding down the dune on our backsides, or driving down it in the 4x4 at an impossible angle.
Called "booming" or "singing," the rumbling sound is emitted as sand avalanches on the steeper, leeward side of the dunes.