底曳網の網成り-1-

概要

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Considering that the various curves of a fishing net assumed in working condition can be approximated by circular arcs of different curvatures, the authors get theoretically 18 equilibrium equations in regard to the distributing tensions and the shape of the net. From these equations, following relations between the horizontal spread of the wing and the height of the net-mouth were obtained: 1) Increasing of the horizontal spread of the wing and increasing of the stream velocity cause the lowering of the height of the net-mouth. 2) The change of the height of the net-mouth due to the change of the horizontal spread of the wing is diminished by the increase of the stream velocity. Experiments were carried out in a water tank of circulation type with a model net designed by a box-type. Comparing the experimental and the theoretical results, a satisfactory consequence is obtained qualitively.
社団法人日本水産学会の論文