Recently, copper alloy netting has been proposed as a material for aquaculture facilities that can be set in harsh offshore environments. To design a cage made of copper alloy netting, it is necessary to calculate the flow of water through the netting and force of external sources on the netting. Therefore, this study measured and analyzed the current velocity reduction after passing through the netting and the hydrodynamic forces acting on the netting using copper alloy netting with nine solidity ratios. As a result of the reduction rate of the flow velocity through the netting, the flow reduction rate was increased as the solidity ratio of netting was increased. The flow reduction rate was also increased as the attack angle on the netting was decreased. In analyzing the resistance on the netting, we also discovered that resistance was increased with increase in the flow velocity and solidity ratio. An analysis of the hydrodynamic coefficient acting on the netting is shown that the drag coefficient tends to increase as the attack angle increases. We also analyzed the hydrodynamic coefficient according to the variation of the Reynolds number. When the drag coefficients acting on the netting were analyzed with the different Reynolds numbers, the Reynolds number increased from over 0.3 m/s to a relative constant. Finally, the copper alloy nettings had a smaller velocity reduction rate when comparing the flow velocity reduction rate between copper alloy nettings and nylon nettings.

서 론
 재료 및 방법
  실험 그물감
  실험수조 및 장치
  유속감소 실험방법
  유체력 계수 실험방법
  공극률
  유체력 계수
  유속감소계수
  레이놀즈수 (Re)
 결과 및 고찰
  공극률에 따른 유속감소
  그물감의 영각 변화에 따른 유속감소
  유속변화에 따른 그물감에 작용하는 유수저항
  레이놀즈수 변화에 따른 공극률별 유체력 계수
  구리합금그물감과 나일론그물감 사이의 유속감소계수 비교
 결 론
 References

• 강아림(전남대학교 대학원 수산과학과) | Ahrim KANG (Department of Fisheries Science, Graduate school, Chonnam National University)
• 이지훈(전남대학교 해양기술학부) | Jihoon LEE (Division of Marine Technology, Chonnam National University) Corresponding author