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Geography

Which outcome is most likely if longshore drift is severely reduced behind a newly constructed breakwater on a barrier island?

A)Increased erosion down-drift along coastline
B)Formation of new offshore sandbars
C)Increased sediment supply for marshes
D)Stabilization of lagoon salinity gradients

💡 Explanation

Erosion increases down-drift because sediment is no longer supplied by longshore drift; this sediment starvation promotes instability. The primary mechanism is sediment transport disruption; therefore significant erosion follows, rather than offshore deposition changes or increased lagoon sediment.

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