関門海峡における乗揚海難と気象との関係
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概要
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The influence of the meteorological conditions on the strandings in the Kanmon strait was analysed statistically in the present report. The data sources for the present study were the original registers of meteorological observation by Simonoseki Meteorological Observatory, the casualty questionnaires for 1962-1969 inquired by the 7th Regional Maritime Safety Hasdquarters, and the official reports of marine traffic survey in the Kanmon Strait by the maritime authorities concerned. And the results were summarized as follows: 1. About 90% of the strandings occurred under the weak wind (<5.5m/s). And the stranding rate, the number of strandings per ships passed, changed in accordance with the wind velocity keeping the following relation: sin^<-1>√<P'>=2.58-1.55(√<Vw+1>)+0.26(√<Vw+1>)^2 where P' is the stranding rate and Vw is wind velocity in m/s. 2. About the three quarters of the strandings occurred in the good visibility (>2km). This was because of far more frequent occurrence of the good visibility than the poor one. And the stranding rate decreased with the visibility keeping the following relation: sin^<-1>√<P'>=1.33Dv^<-0.44> where P' is the stranding rate and Dv is visible distance in km. 3. In respect of the influence on the stranding rate, the visibility of 2 km was estimated to be corresponding to the wind of 20m/s and 1km to 24m/s. 4. In the Eastern area and Hayatomo seto (both defined in Fig.1) were seriously suffered from the fall visibility, and the stranding rate in these areas under the dense fog (<0.2km in visibility) were remarkably increased in to more than 100 times as high as that in respective areas estimated through all visibility conditions. 5. About 90% of the strandings under the poor visibility (<2km) was responsible for the ship of less than 1,000 gross tons. This was because of more frequent passing of small ships than largeones. And stranding rate increased in accordance with the ship size keeping the following relation: P'_<PV>=2.09x^<0.35>×10^<-4> where P'_PV is the stranding rate in the poor visibility and x is the size of ship in gross tonnage.
- 1974-07-31
著者
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