Sea state

prefLabel
  • Sea State
definition
  • A measure of the roughness of the sea surface; a scale of surface wave conditions related to the speed of wind.  
inScheme
broader
Abstract from DBPedia
    In oceanography, sea state is the general condition of the free surface on a large body of water—with respect to wind waves and swell—at a certain location and moment. A sea state is characterized by statistics, including the wave height, period, and spectrum. The sea state varies with time, as the wind and swell conditions change. The sea state can be assessed either by an experienced observer (like a trained mariner) or by using instruments like weather buoys, wave radar or remote sensing satellites. In the case of buoy measurements, the statistics are determined for a time interval in which the sea state can be considered to be constant. This duration has to be much longer than the individual wave period, but shorter than the period in which the wind and swell conditions can be expected to vary significantly. Typically, records of one hundred to one thousand wave periods are used to determine the wave statistics. The large number of variables involved in creating and describing the sea state cannot be quickly and easily summarized, so simpler scales are used to give an approximate but concise description of conditions for reporting in a ship's log or similar record.

    海況(かいきょう)とは、海の状態のことである。水温や海水内の塩分分布、海流状態、水塊、プランクトンの状況、pH、波浪状態、透明度、溶存酸素量などを総合したもので、普通は水温、水塊、海流を解析して行う。日本では東北や北海道の冷害に対し親潮との関係が深いと考えられている為、古くから調査が行われている。なお予想は天気予報に比べると精度は低いが、日本では毎年3月に気象庁から発表される。また、海の荒れ模様を数字で表すことも海況という。

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

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