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← GeographyWhich consequence results when eustatic sea-level rise breaches barrier island dunes?
A)Increased foreshore sedimentation rates offshore
B)Overwash deposition onto back-barrier flats✓
C)Accelerated isostatic rebound of the mainland
D)Reduced thermohaline circulation nearshore
💡 Explanation
Overwash deposition occurs because wave energy and storm surge bypass the weakened barrier via overwash. Therefore, sediment is carried landward toward back-barrier flats rather than being deposited further offshore, changing isostatic or thermohaline processes.
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