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← GeographyWhich outcome occurs when wind exceeds threshold friction velocity parallel a vegetated dune field?
A)Dune crest erosion decreases sharply
B)Saltation-dominated sand transport increases✓
C)Surface creep becomes the dominant process
D)Vegetation cover rapidly regenerates inland
💡 Explanation
Increased wind beyond friction velocity initiates saltation, causing increased sand transport because particle lift occurs and then is propelled by the aerodynamic drag of the dune surface. Therefore, saltation-mediated sand transport is heightened, rather than crest stability, since vegetation offers less friction defense for faster winds.
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