Which morphological outcome occurs when barchan dune crests destabilize?

💡 Explanation

Increased onshore wind strength beyond the dune’s angle of repose results in parabolic dune formation increased via deflation, because sand slips downwind from the eroded crest. Therefore, parabolic dunes form, rather than seif merging, due to the stabilization that initiates after breakdown.

• Which outcome occurs when widespread destabilization of permafrost increases?
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• Which process dramatically accelerates when meandering river's neck is cut off?
• Which barometric outcome results if rising, saturated air reaches the tropopause and ascends no further?
• Which risk increases when poorly designed buildings experience liquefaction?
• Which hydrologic outcome is accelerated when increased glacial ablation exceeds stream incision?