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Geography

Which outcome occurs when a coastal barrier island's sediment supply is disrupted by anthropogenic coastal armor?

A)Net landward barrier island migration
B)Enhanced sediment deposition offshore
C)Decreased over-wash of the barrier
D)Increased salinity in coastal lagoons

💡 Explanation

Net landward barrier island migration accelerates because wave-driven **longshore drift** transports sediment, undermining the seaward side: This causes rollover, therefore the island shifts landward, rather than remaining stable or accreting offshore like in equilibrium.

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