Abstract
An approximate formula for the headline height of a bottom gill net set across a water flow was derived analytically from estimates of a cross-sectional shape, calculated numerically from differential equations describing the forces of the net. It was assumed that the headline was set perpendicular to a uniform current and with the headline free. This approximate formula is h/l=(2B−wl)/√(2b+kl) 2 U 4+(2B−wl) 2 where h is the headline height, l the depth of the bottom gill net, B the buoyancy of the headline, w the weight of the net webbing in water, b the drag coefficient of the headline, k the drag coefficient of the net webbing, and U ̄ the mean speed of the water flow within the net height. This formula was compared with data obtained separately in a flume experiment, close agreement being obtained.
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