Quantification of water flow and net drag in midwater trawls
Document Type
Article
Date of Original Version
1-1-1993
Abstract
The flow velocity and hydrodynamic drag of 18 quarter-scale midwater box trawl nets were quantified in a circulating water channel using electromagnetic current meters and strain gauges, with the mouth of each net attached to a rigid pipe frame to maintain geometric similarity. The experimental matrix involved three mesh sizes (25, 50, and 100 mm), three twine diameters (0.5, 1, and 2 mm), two webbing tapers (all bar and three points to one bar), and three test speeds (30, 60, and 90 cm s-1. Under this design, the significant factors affecting the velocity gradient within or ahead of the nets were found to be the solidity ratio of the webbing and the towing speed. The significant factors affecting the drag coefficient of the nets were the solidity ratio and the average webbing angle of incidence. The towing speed was not found to significantly affect the drag coefficient under the experimental conditions. © 1993.
Publication Title, e.g., Journal
Fisheries Research
Volume
16
Issue
2
Citation/Publisher Attribution
Buxton, N. G., and J. T. DeAlteris. "Quantification of water flow and net drag in midwater trawls." Fisheries Research 16, 2 (1993). doi: 10.1016/0165-7836(93)90050-H.