Offshore aquaculture platforms, or fish cages, are increasingly becoming popular in recent years in the effort of meeting the world’s demand for seafood products. As a result, these platforms are being deployed further offshore in order to avoid causing pollution to near shore waters by densely populated platforms. On the other hand, the dimensions of the platforms are also becoming larger, reaching over 100 m in diameter in the recent designs. As the aquaculture platforms are typically of frame type structures consisting of slender beams which support the net around the frame, the hydrodynamic properties of the platform is quite complex and yet is very important to the adequate design of the platform and its mooring system as any significant under design or over design of the platform and mooring system can incur serious economic consequences. In this paper, a method based on the conventional potential flow theory and Morison equation is proposed for the assessment of the hydrodynamic loads on the aquaculture platforms including its frame and net. This method can take into account the sheltering effect due to the surrounding net or beams but neglects the energy dissipation due to the viscosity of the fluid. A Morison model for an aquaculture platform is constructed and a mooring system is designed in this paper followed by the time domain analysis to assess the hydrodynamic forces, motion responses and mooring system performance in various environmental conditions. The numerical results indicate that the motion of the platform and the mooring tension can meet the design requirements in survival environmental conditions, and the proposed method provides a useful and efficient tool for the evaluation of the performances of the aquaculture platforms.
Hydrodynamic Analysis of Offshore Aquaculture Platform and Its Mooring Design
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-04
13 pages
Article/Chapter (Book)
Electronic Resource
English
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