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The depth of closure on a beach profile is

  • A.the depth at which waves first break
  • B.the depth of the deepest part of a harbour
  • C.the depth below which the tide no longer varies at all
  • D.the depth beyond which profile change becomes negligible

Answer: D

Correct answer: the depth beyond which profile change becomes negligible

The depth of closure is the seaward limit of the actively reworked profile: beyond it the bed shows no measurable change from year to year. It defines the outer edge of the littoral zone for budget purposes, and it decides whether nourishment sand placed offshore will feed the beach or be lost - which is why it is computed before any nourishment scheme is designed.

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