小型漁船の遭難・捜索に関する海上実験-III : 風向が変化する場合の捜索区域決定の一考察

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The authors have continued the experiment on the sea to examine the drifting characteristics of several things drifting on sea surface, and knew that the exactitude of a seach area is largely controlled by the current in that sea area. However, since the correct estimation of this current is difficult, as the method of presuming a search area independent of current, the experiment using a SOS automatic transmission buoy (type FRB-52; SOS buoy) was attempted. The results are summarized as follows. (1) Similar to other drifting things, the SOS buoy is also driven by the current in that sea area leeward at the peculiar drifting velocity due to wind pressure. (2) Drifting human bodies showed the relative drifting velocity due to wind pressure in relation to the SOS buoy in the range approximately determined by the following equation according to the drifting posture. (See Fig.4) 0<V<0.017W+0.05 where, V: relative drifting velocity due to wind pressure (kn), W: mean wind velocity (m/s). (3) when the track of drift due to wind pressure in relation to the SOS buoy was determined from Fig.4 in the case of the wind blowing at the same velocity in the same direction, Fig.10 was obtained, and the position P of a drifting thing as seen from the SOS buoy at an arbitrary time is the point at the distance D determined by the following equation. D=2Rsinθ where, R: radius of relative track circle (N. M), θ°: half of the angle of change of wind direction wt° (Fig.9).
社団法人日本航海学会の論文
1985-09-20

小型漁船の遭難・捜索に関する海上実験-III : 風向が変化する場合の捜索区域決定の一考察

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