源式網の漁具性能に関する研究-1-源式網の運動

概要

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In order to explain the mechanical characters of motion of the Gensiki-ami, a kind of bottom drift net for catching shrimps, field experiments with underwater observations by divers were carried out in Mikawa Bay in the summer of 1974. From results of the experiments and dimensional analysis an experimental formula for relative speed of the gear V was derived, namely: V=U-v;=0.8μW|√ lkB where U is the speed of the tidal current, v drifting speed of the gear, μ frictional coefficient of sinker side against sea bed, W apparent weight of sinker side in water, l depth of the gear, k drag coefficient of web, and B buoyancy of the float side. It was found that on a uniform bottom material the relative speed of gear is kept constant irrespective of the speed of the tidal current as far as the gear drifts. On the problem that the gear shortens horizontally when drifting, it was explained theoretically that the relative speed is unchanged by shortening of the gear.
日本水産學會の論文