Discussion
A seawall protects the land behind it but frequently
Answer: D
Correct answer: accelerates the lowering of the beach in front of it
A wall reflects wave energy instead of letting the beach absorb it, and the reflected waves and the scouring flow at the toe carry sediment away. The beach in front therefore steepens and lowers, which exposes the wall to larger waves and to toe undermining - a process that feeds itself. The wall does its own job, protecting the land behind, but it does nothing for the beach and often hastens its loss.
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