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← GeographyWhich outcome occurs when persistent unidirectional wind encounters transverse dune fields lacking vegetation?
A)Barchanoid ridges slowly migrate downwind.✓
B)Parabolic dunes anchor, preventing migration.
C)Seif dunes vertically accrete in place.
D)Nebkha dunes form in isolated hummocks.
💡 Explanation
Barchanoid ridges form due to transverse dunes experiencing transverse migration of loose sand downwind via saltation. This occurs because consistent unidirectional winds lead to net transport in that direction, therefore creating these long ridges rather than any stationary dunes.
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