Discussion
Nourishment sand placed seaward of the depth of closure
Answer: D
Correct answer: is generally regarded as lost to the active beach profile
The depth of closure is the seaward limit beyond which the profile shows no measurable change from year to year, so sediment placed beyond it is outside the zone the waves rework and will not come ashore on any useful timescale. Placing there is cheaper per cubic metre, since the dredger need not approach the beach, but the sand does not do the job it was bought for.
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