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Provedor de dados:  ArchiMer
País:  France
Título:  The effect of the bottom boundary layer on trawl behaviour
Autores:  De La Prada, Amelia
Priour, Daniel
Data:  2015-06
Ano:  2015
Palavras-chave:  Trawl
Numerical model
Bridle tension
Bottom boundary layer
Water speed
Resumo:  Thirty-seven hauls of a bottom trawl were carried out, as part of a national French project. These sea trials were undertaken in an area with strong currents: up to 1 knot. The measurements at sea of the bottom bridle’s tension show a clear effect of the current. Although the water speed relative to the trawl is constant, when the boat tows with current, the bottom bridle’s tension increases, and when the boat tows against the current, the bottom bridle’s tension decreases. The mean bottom bridle tension is 7840 N and increases with a slope of 1197 N for each m/s of current. The current has almost no effect on the top bridle’s tension: for a mean value of approximately 9810 N, the increment is 106 N for each m/s of current. The modelling of the trawl gear and the boundary layer explains this behaviour. Boundary layers of different thicknesses have been simulated. A boundary layer of 0.9 m height shows the best fit between simulation and measurements. The simulated bottom bridle’s tension increases to 1343 N each m/s of current while the top bridle’s tension decreases to 320 N each m/s. These values are inside the standard deviation of the measurements.
Tipo:  Text
Idioma:  Inglês

Editor:  Pergamon-elsevier Science Ltd
Formato:  application/pdf
Fonte:  Ocean Engineering (0029-8018) (Pergamon-elsevier Science Ltd), 2015-06 , Vol. 101 , P. 142-151
Direitos:  2015 Elsevier Ltd. All rights reserved.


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