ウバガイ噴射式桁網のつめ角度について

概要

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Dynamics of Japanese surf clams as they come in contact with the teeth of hydraulic jet dredge, is analyzed and the optimum teeth angle is discussed. The teeth angle is consider to be a function of the weight of the shell in the sand, the drag force of the shell moving vertically, the static fric-tional coefficient between the shell and the teeth, and the horizontal component force acting on the shell by the teeth. The parameters were measured under laboratory conditions, and for the type of clams used in our experiments the teeth angle of the dredge (θ) can be simply expressed as a function of shell length (L);θ≤tan-1 {(0.058L2.0-0.025e0.39L)/(0.029L2.0+0.050e0.30L)}.The teeth angle θ for a shell of 10cm long was calculated by this formula, and the optimum teeth angle θ was found to he less than 40°C.
日本水産學會の論文