Miche criterion

In fluid dynamics and coastal engineering, the Miche criterion, Miche formula or Miche breaking index is a theoretical upper bound on the steepness of a non-breaking, periodic wave in finite water depth. It gives the maximum wave height that can persist at a given depth and wavelength. Waves that exceed this bound are unstable and must break. The criterion was derived by French engineer Robert Miche in 1944 at the École nationale des ponts et chaussées in a study of wave motion over constant and decreasing depth.

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