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The stability number used in armour design is defined as

  • A.wave height set against the depth of water at the toe
  • B.wave period set against the height reached at breaking
  • C.unit mass divided by the total mass of the armour layer
  • D.wave height divided by the relative density and the unit size

Answer: D

Correct answer: wave height divided by the relative density and the unit size

The stability number is

\[ N_s = \frac{H}{\Delta D_{n50}} \]

with \( \Delta \) the relative buoyant density of the unit and \( D_{n50} \) its nominal diameter. It is the dimensionless group in which every armour stability formula is expressed, and it makes plain what can be traded: a denser unit or a larger one both reduce it, and a larger wave raises it.

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