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combined seas Generally referred to as SEAS. Used to describe the combination or interaction of wind waves and swell in which the separate components are not distinguished. This includes the case when swell is negligible or is not considered in describing sea state. Specifically, SEAS = square root [(wave height)^2 + (swell height)^2] When used, SEAS should be considered as being the same as the significant wave height. Some authors use the word "seas" to mean only the wind waves.

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