Analysis of aquaculture safety in marine cage culture area of Maniao bay under the effect of typhoon

Typhoon is a significant natural disaster in coastal regions, which poses a serious threat to the safety of deepwater cages. By taking Maniao Bay as a representative research area, the method of evaluating the safety of aquaculture cages under the impact of typhoon is introduced in detail in this paper. Based on the coupling Holland wind field model and the Delft3D wave-flow model, the processes of typhoon wave and storm surge in Maniao Bay are simulated under the influence of the strong typhoon Rammasun. The result shows that during the passage of Rammasun, the maximum significant wave height in the cage culture area of Maniao Bay exceeds 5.5 m, the maximum flow velocity is approximately 1.5 m/s, surpassing the limit carrying capacity requirements of the cages, and the cages may deformation and damage. To further assess the impact of typhoon tracks and intensity on aquaculture safety, six different typhoon tracks (T1-T6) are constructed by translating the track of typhoon Rammasun. Subsequently, the simulation results of these six typhoon tracks are compared under three different typhoon intensities of "Super TY", "STY", and "TY", the typhoon track ensemble areas posing a threat to deep-water net cages in Maniao Bay under varying intensities is identified.