Pierson-Moskowitz scale
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sea state — A scale that categorizes the force of progressively higher seas by wave height. This scale is mathematically co related to the Pierson Moskowitz scale and the relationship of wind to waves. See also Pierson Moskowitz scale … Military dictionary
Sea state — A sea state includes the height, period, and character of waves on the surface of a large body of water. The large number of variables involved in creating the sea state cannot be quickly and easily summarised, so simpler scales are used to give… … Wikipedia