巾着網の研究-II : 網地の目合と比重の影響

概要

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The influence resulting from the ratio of the diameter of the twine to the length of bar (D/L) and the specific gravity of webbing (ρ) on the characteristics of the purse seine was investigated. The results obtained are summarized as follows: 1) The webbing of a net which has a small D/L ratio sunk faster than that which has a large D/L ratio. It was found that the sinking speed of bottom margin was approximately proportional to 1/√D/L, while ρ exerts little effect on the sinking speed. 2) The netting form during the course of pursing depends chiefly upon the D/L ratio of webbing, and it was observed that nets with small D/L ratio rarely form a “cup-like” shape. 3) Tension in the purseline is proportional to the D/L ratio and ρ.
公益社団法人日本水産学会の論文