船舶衝突海難の見張りに関する一考察

概要

論文の詳細を見る
The visual perception of a target at sea is the most important factor in good seamanship and therefore the need in keeping a proper lookout is paramount in preventing maritime traffic accidents. This study shows the environmental factors and visual conditions concerning a good lookout which are extracted from 1, 000 reports of the Marine Accidents Inquiry Agency. Authors deduce from these reports the background factors of visual perception in the case of ship collisions. They are as follows; 1. In daytime, it is difficult to see other ships when in the sun's direction and when the sun's altitude is from -9 to 40 degrees. 2. In cloudy weather, and when the sun's altitude is more than 40 degrees, the influence of the luminance in the sky is small from the visual perception. 3. In nautical twilight, which is when the sun's altitude is from -9 to 0 degrees, the number of ship collisions is few when compared with when the sun's altitude is under 40 degrees. 4. Many ship collisions occur between the times of from 6 : 00 to 8 : 00 A.M and from 2 : 00 to 3 : 00 P.M. 5. When the sun's altitude is about 20 degrees above the horizon the luminance of the sky in the sun's direction affords maximum brightness and thus minimum visibility.
社団法人日本航海学会の論文
1998-09-25