Analysis on Background Factors in Marine Accidents and Incidents Caused by Watch-keeper Drowsiness

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  • 操船者の眠気による船舶の事故及びインシデントの背景要因分析
  • 操船者の眠気による船舶の事故及びインシデントの背景要因分析[含 質疑応答]
  • ソウセンシャ ノ ネムケ ニ ヨル センパク ノ ジコ オヨビ インシデント ノ ハイケイ ヨウイン ブンセキ ガン シツギ オウトウ

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The proportion of accidents that caused by dozing watch-keepers in all ship accidents are about 10%. The purpose of this study is to perform a feature extraction of sleep and lifecycle characteristics of watch-keepers involved in marine accidents and incidents. A questionnaire that included attributes of the watch-keeper, amount of sleeping hours, problems related to sleep, fatigue, near miss incidents (hiyari-hatto incidents), and the Epworth sleepiness scale (ESS) was administered to a sample of 7,750 watch-keepers (collection rate: 21.3%). The analysis of cargo ships and tankers revealed there was a notable relationship between the situation of "frequency of sleep per 1 day" due to shift of watch and the influence of each "sleep delay", "frequency of interrupted sleep" and "early morning sleeplessness". Consequentially, these factors were related to of "frequency of near miss incidents". These results suggested that watch-keepers each ship have problems related to sleep due to sleep and lifecycle characteristics.

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