Which dune type results when bimodal wind regimes restructure existing dunes?

💡 Explanation

Reversing dunes form due to seasonally shifting winds. Migration halts because wind direction changes lead to complex airflow patterns preventing net sand transport. Therefore, the crest stabilizes rather than migrating like barchans; vegetation loss causes other parabolic formations instead.

• Which risk increases when glaciers recede and drain lakes?
• Which phenomenon causes increased coastal aridity when intensified subtropical gyre circulation upwells cold water?
• Which displacement occurs on southbound trans-polar flights due to atmospheric dynamics?
• Along coastal desert regions, which mechanism causes cool offshore waters to create advection fog?
• Which consequence results when isostatic rebound stresses pre-existing fjord bedrock?
• What outcome develops where mountain river flow enters unconfined floodplain terrain?