Study of the Six-seam Trawl―I The Mechanical Characteristics of a Six-seam Trawl Net

概要

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In order to improve the design of fishing gear and its performance, the knowledge of the characteristics of the gear in operation is of a major importance. Meanwhile, the behaviour of a trawl gear is much affected by its geometrical performance accompanied by hydrodynamic forces acting on. Considering that the hydrodynamic forces by the current on an operating trawl net finally act on the harness lines, and the geometric planform of the harness lines could be approximated to be a part of circular arc of various curvatures or a straight line, a set of twenty equations from the theoretical analysis of the geometrical configuration and the mechanical characteristics of a six-seam constructed trawl net is presented in this paper. To verify the validity of the theoretical analysis, a series of experiments on the six-seam trawl model was conducted in a ferro circulating water tank. Accordingly, the agreement between theoretical analysis and experiments of model was not close enough to be accepted uncritically, especially for its performance, however the analysis of the total resistances was in favorable agreement to the experimental results.
長崎大学水産学部の論文