風圧による船舶の横偏流について-IV : 斜め風によるLee way(日本航海学会第37回講演会)

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Side-drifting of a ship is caused by the force of the wind on the upper structure of the ship, drift currents increasing with the wind, rolling caused by the wind waves and swells, and ocean and tidal currents. To investigate the effect of the wind on side-drifting, it was necessary to carry out an experiment in which it was possible to removing the effects by the other causes. The authors planned to measure the lee way when the ship's course was 45°and 135°in relation to the direction of the true wind. The method 1. This experiment was carried out on the Oshoro-maru, a fishery training ship of Hokkaido University, when her speed was 3.5, 6, 9, 12kt, in the Bering Sea. 2. The corner reflector which was connected to the salmon-gill net was selected as the datum point of the experiment. In this case, the reflector was allowed to drift along with the ship influenced by currents and waves, but not by the wind. 3. As shown in Fig.1 the observers on the ship measured the distance and the bearing of the reflector by radar at observation points 1 & 2, and calculated the course and the lee way. The result 1. The relation between the true (absolute) wind velocity and the lee way is shown in Fig.2, and the relation between the proportional coefficient (K) in Fig.2 and the ship's speed is shown in Fig.3. 2. The relation between the apparent (relative) wind and the lee way are shown in Fig.4, and the relation between the proportional coefficient in those figures and the ship's speed is shown in Fig.5.
社団法人日本航海学会の論文
1967-12-25

風圧による船舶の横偏流について-IV : 斜め風によるLee way(日本航海学会第37回講演会)

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