Understanding the hydrodynamics of a size sorting grid in a crustacean fishery

OCEAN ENGINEERING

卷:198

Article

Veiga-Malta, T.¹  Breddermann, K.²  Feekings, J. P.¹  Krag, L. A.¹  Paschen, M.² 

[1] Tech Univ Denmark, DTU Aqua, Niels Juels Vej 30, DK-9850 Hirtshals, Denmark

[2] Univ Rostock, Chair Ocean Engn, Justus von Liebig Weg 2, D-18059 Rostock, Germany

关键词: Grid angle;    Bar shape;    Hydrodynamics;    Wind tunnel;    Grid porosity;    Crangon crangon;   

DOI  :  10.1016/j.oceaneng.2020.106961

来源: Elsevier

【 摘 要 】

A size-sorting grid with a 6 mm bar spacing was proposed for a brown shrimp (Crangon crangon) beam trawl fishery. Considering the bar spacing, concerns regarding the hydrodynamics of such grid were raised. Here we experimentally investigated the hydrodynamics of four grid designs in a wind tunnel to identify which parameters mostly affected flow. By observing the Reynolds similarity criteria, we ensured that the measurement results in the wind tunnel are applicable in water. The four grids were tested at different angles of attack and wind velocities. Porosity and the inclination of the grid were found to be the main factors affecting the flow. The shape of the bars was also found to affect the flow, although to a lesser extent than porosity and angle, indicating that grid effectiveness is a function of how they are designed and installed in the fishing gear.

【 授权许可】

Free