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oai:ir.kagoshima-u.ac.jp:00010806 2026-03-03T09:40:26Z 228:262:4825 39:40

底曳網の天井網に起因する揚力 Lift caused by the Square of Trawl Net 不破, 茂 FUWA, Shigeru open access In the present report, the auther has done experimental research in order to clarify the effect of the square part of trawl net on the gear efficiency and, also to get basic data. He has conducted field experiments, boarding a Bull trawler in East China Sea, made a series of model experiments in a circular tank, using a simple model net made by adding a square net to a cone-shaped drag net. He will report a few findings brought about by the analysis of data of these field and model experiments. They are summarized as follows; (1) From results of the field experiments upward force of 180-250kg is acting at the bosom of the ground rope, and it seems to be caused by the square part of trawl net. (2) The existence of lift by tha square of trawl net has been made clear. The lift increases in proportion to the flow speed and the angle of attack of square. 底曳網の天井網が漁具性能に及ぼす影響を明らかにするために海上実験と模型実験を行った。これらの実験資料を解析して以下の結果を得た。(1) 海上実験よりグランドロープには180~250kgの上向きの力が作用しており,この力は天井網に起因する揚力であると考えられる。(2) 天井網の揚力は流速及び迎角に比例して増加する傾向が認められた。 鹿児島大学 Kagoshima University 1983-12-25 jpn departmental bulletin paper VoR http://hdl.handle.net/10232/13294 https://ir.kagoshima-u.ac.jp/records/10806 0453087X AN00040498 鹿児島大学水産学部紀要 Memoirs of Faculty of Fisheries Kagoshima University 32 245 251 https://ir.kagoshima-u.ac.jp/record/10806/files/AN00040498_v32_p245-251.pdf application/pdf 553.7 kB 2016-10-31 1983-12-25