FN Archimer Export Format
PT J
TI The effect of the bottom boundary layer on trawl behaviour
BT 
AF DE LA PRADA, Amelia
   PRIOUR, Daniel
AS 1:1;2:2;
FF 1:;2:PDG-REM-RDT-LCSM;
C1 Univ A Coruna, Lab Ingn Mecan, Ferrol 15403, Spain.
   IFREMER, F-29280 Plouzane, France.
C2 UNIV A CORUNA, SPAIN
   IFREMER, FRANCE
SI BREST
SE PDG-REM-RDT-LCSM
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 1.488
TC 3
UR https://archimer.ifremer.fr/doc/00266/37710/35800.pdf
LA English
DT Article
DE ;Trawl;Data;Numerical model;Bridle tension;Bottom boundary layer;Water speed
AB 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.
PY 2015
PD JUL
SO Ocean Engineering
SN 0029-8018
PU Pergamon-elsevier Science Ltd
VL 101
UT 000358100400014
BP 142
EP 151
DI 10.1016/j.oceaneng.2015.04.027
ID 37710
ER

EF