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The depth of closure typically lies at what order of depth on an open sandy coast?

  • A.200 to 500 metres
  • B.5 to 10 metres
  • C.50 to 100 metres
  • D.0.5 to 1 metre

Answer: B

Values depend on the wave climate and the period considered, but this range is typical. The Hallermeier relation estimates it from the wave height exceeded a small fraction of the time. Longer records give a greater closure depth.

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