Effects of mooring line breakage on dynamic responses of grid moored fish farms under pure current conditions

OCEAN ENGINEERING

卷:237

Article

Cheng, Hui¹  Li, Lin¹  Ong, Muk Chen¹  Aarsaether, Karl Gunnar²  Sim, Jaesub¹ 

[1] Univ Stavanger, Dept Mech & Struct Engn,Mat Sci, Univ Stavanger,Kjell Arholms gate 41, N-4036 Stavanger, Norway

[2] UiT Arctic Univ Norway, Dept Technol & Safety, N-9037 Tromso, Norway

关键词: Norwegian fish farm;    Mooring line breakages;    Mooring system;    Numerical simulation;    Grid moored fish farm;   

DOI  :  10.1016/j.oceaneng.2021.109638

来源: Elsevier

【 摘 要 】

Due to the lack of sheltered area, Norwegian fish farms are expanding to more exposed and remote sites. The severe environmental conditions in exposed sites can increase the risk of structural failure during aquaculture operations. In the present study, the program FhSim is employed to conduct time-domain simulations to investigate structural responses of a single-cage and 1 x 4 multi-cage fish farm due to breakages in mooring lines. The influences on the tension distribution in the mooring system and the displacement of the buoys due to breakage at different mooring lines are analysed in detail. Based on the analysis, a method to identify the broken mooring line and to predict the maximum tension increment in the remaining mooring lines is proposed. The results indicate that the breakage at one mooring line is unlikely to cause a progressive collapse of the fish farm immediately when the current velocity is less than 0.5 m/s. However, these breakages may cause structural collapses and fish escapes when the current and waves increase. In order to prevent fish escapes, suggestions to improve the mooring system design and recommendations for monitoring during operations are given.

【 授权许可】

Free