RIASSUNTO
ABSTRACT
This investigation focuses on the motion of the floating circle collar of the gravity fish cage exposed to the open ocean waves. Both numerical computation and physical experiment were conducted. Regular waves were experimented at the water depth of 20 m. Wave height is 4, 5.5, or 7 m, and wave period is from 5 to 9 s. The comparison between the computed results and the experimental data has verified the numerical method proposed in the paper.
INTRODUCTION
The problem of the demands for seafood has been becoming more and more severe in the world due to the expansion of the global population and the decline in the fishery supply. This problem of supply and demand has been solved, or rather, has been alleviated in the past two decades through the marine aquaculture in shallow water. Thus, the near-shore marine aquaculture has brought many achievements. Bessonneau and Marical (1998) simulated the dynamic behavior of some submerged flexible reticulated surfaces. Lee and Wang (2000) studied the dynamic behavior of the tension-leg platform with the netcage system and derived a set of equations of motion of a simplified two-dimensional case. Colbourne and Allen (2001) measured the waveinduced mooring line forces on a full-scale cage and the wave-induced loads and motions of a model cage. Fredriksson (2001) physically and numerically modeled the open ocean fish cage and the mooring system dynamics.
Recently, the amount of the near-shore marine aquaculture has been decreased, because the near-shore marine aquaculture is not beneficial to the dispersion of wastes and the multipurpose utilization of the coastal line. These problems, by contrast, can be simply avoided by moving aquaculture into the deep sea. It is evident that the deep-sea aquaculture has many advantages, especially in the sense of the environmental protection and the near-shore development.