Significant wave height

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  • Significant Wave Height
definition
  • The average height of the highest one-third of all waves occurring in a particular time period.  
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broader
Abstract from DBPedia
    In physical oceanography, the significant wave height (SWH, HTSGW or Hs) is defined traditionally as the mean wave height (trough to crest) of the highest third of the waves (H1/3). Nowadays it is usually defined as four times the standard deviation of the surface elevation – or equivalently as four times the square root of the zeroth-order moment (area) of the wave spectrum. The symbol Hm0 is usually used for that latter definition. The significant wave height may thus refer to Hm0 or Hs; the difference in magnitude between the two definitions is only a few percent.

    有義波(ゆうぎは)とは、ある地点で連続する波を1つずつ観測したとき、波高の高い方から順に全体の1/3の個数の波(例えば100個の波が観測された場合、高い方から33個の波)を選び、これらの波高および周期を平均したものをそれぞれ有義波高、有義波周期と呼び、その波高と周期を持つ仮想的な波のことである。

    (Source: http://dbpedia.org/resource/Significant_wave_height)

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