小型漁船の遭難・捜索に関する海上実験-II : 膨脹式救命いかだ(乙種)及び人体模倣人形の漂流特性

概要

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The authors have made an experiment at sea in order to determine drifting characteristics of inflatable life-raft (home made the second type) and floating life-sized doll of a vertical style. Followings are summary of this experiment. (1) The drifting speed of the life-raft due to effects of wind and wave is roughly expressed as follows. Condition 1. V=0.113W Condition 2. 0.054W<V<0.101W Condition 3. V=0.084W Where V is the drifting speed in Knot, W is wind speed in m/sec at 10 meter above sea surface. Condition 1; an unoccupied deployed drogue and canopy, Condition 2; an unoccupied ployed drogue and canopy, Condition 3; an occupied half or full load ployed drogue and canopy. Direction of drift was the about leeward from the point where the life-raft brought by the current. (2) The floating life-sized doll was mainly transported by the current. The drifting speed by wind and wave was shown as follow. V=0.01W+0.061 (3) Based on this experiment, accurate estimation of the current appears to be the most important factor in searching a target (especially human body). From this point of view, detailed study of interaction between direction of ocean current and dislocation of floating material will be required in future.
社団法人日本航海学会の論文
1984-09-25