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The design wave height at the toe of a shallow water structure is often governed by

  • A.the mean wave height over the whole of the design life
  • B.the tidal range at the site rather than the wave climate
  • C.depth limited breaking rather than the offshore extreme
  • D.the offshore extreme wave height without any modification

Answer: C

Waves larger than about 0.6 times the local depth cannot reach the structure at all. Water level therefore becomes as important as the offshore wave climate in setting the design condition. A higher water level admits a larger wave to the toe.

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