How is seif dune formed from barkhan

1.	How is seif dune formed from barkhan
Answer» Answer: Formation is DEBATED. Bagnold, in The Physics of Blown Sand and Desert DUNES, suggested that some seif dunes FORM when a barchan dune moves into a bidirectional wind regime, and one arm or WING of the crescent elongates. Others suggest that seif dunes are formed by vortices in a UNIDIRECTIONAL wind.

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Answer:

Formation is DEBATED. Bagnold, in The Physics of Blown Sand and Desert DUNES, suggested that some seif dunes FORM when a barchan dune moves into a bidirectional wind regime, and one arm or WING of the crescent elongates. Others suggest that seif dunes are formed by vortices in a UNIDIRECTIONAL wind.

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How is seif dune formed from barkhan​

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How is seif dune formed from barkhan