This study is aimed to analyze the hydrodynamic characteristics of the cage net in the circulating water channel. It visualized wake flows using a PIV (paricle imaging velocimetry) and analyzed the flow velocity distribution. In addition, the vorticity and turbulence intensity were analyzed from the wake flow distribution and compared changes by flow velocity. Results showed that the average turbulence intensity in the circulating water channel was very stable showing less than 1% in the range between 0.2 and 0.8 m/s. The drag coefficient affecting to the netting was estimated to be 1.35. The flow decreasing rate of the wake in the middle of the netting was 2.1% at the range of 0.2 m/s and it was constant at 6.6―6.9% over the range of 0.4 m/s irrespective of velocity increases. Finally, the change of turbulence intensity by netting and knot mesh could be confirmed. These results can be utilized as a basic information for the future research of flow characteristics by fishing nets and meshes.

• 배재현(국립수산과학원 동해수산연구소 해역산업과) | Jae-Hyun BAE (Aquaculture Industry Division, East Sea Fisheries Research Institute, National Fisheries Research & Development Institute, Gangneung 210-861, Korea) Corresponding author
• 안희춘(국립수산과학원 동해수산연구소 해역산업과) | Heui-Chun AN (Aquaculture Industry Division, East Sea Fisheries Research Institute, National Fisheries Research & Development Institute, Gangneung 210-861, Korea)