Barchan dunes: why they cannot be treated as 'solitons' or 'solitary waves'
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Schwämmle and Herrmann (Nature, 2003, vol. 426, p. 619) have suggested that two sub-aerial barchan sand dunes could 'pass through one another while still preserving their shape' in a manner similar to solitons or solitary waves. A wide range of published field and wind tunnel evidence suggests that this assertion should not go unchallenged.
Earth Surface Processes and Landforms