斜め追波中の危険出会い群波現象に対する一考察

概要

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When ship speed is almost the same as the group velocity of dominant wave in following or quartering seas, the ship will be attacked by highest waves successively in a certain probability. This phenomena is particularly dangerous, because such repeated attack of high waves will induce various bad effects on ship safety such as stability loss, unstable or synchronous rolling motions, shipping water, etc. This dangerous encounter wave group phenomena can be explained by the feature of encounter wave spectrum which is transformed from wave spectrum for the sea state concerned, i. e. a large part of wave energy of the sea concentrates in a narrow band of encounter wave frequency. By introducing the wave energy concentration ratio, the degree of danger to encounter with successive high waves is determined. The model test results show the validity of this idea. The author proposes a diagram to judge the dangerous condition in relation with ship speed, encounter angle and wave period. This diagram will be useful as s guideline for safe navigation in following and quartering seas.
社団法人日本航海学会の論文
1992-03-25