Research on the Mooring System of Fishery-Photovoltaic Complementary Integrated Structure Under Wave Action

ABSTRACT: The influence of mooring system parameters on the hydrodynamic characteristics of waves of the Fishery-Photovoltaic complementary integrated platform formed by installing aquaculture cages on the Huaneng ‘Huanghai No.1’ floating photovoltaic platform is studied. It systematically investigates the influence of mooring system parameters on the wave-induced hydrodynamic performance of the integrated platform. A fully coupled numerical model for the integrated platform-mooring system is established using the OrcaFlex11.4c software. The reliability of the proposed numerical method is validated against the Cylindrical Floating Production, Storage and Offloading (CFPSO) wave basin model test and the net cage flume test. Through 17 simulation cases with gradient mooring radius settings, this study elucidates the response pattern of the mooring system as it transitions from a catenary configuration to a taut configuration. The results indicate that a relative mooring length of approximately 0.73 corresponds to the critical threshold. At this threshold, mooring stiffness rises abruptly, platform motion responses are markedly suppressed, cage volume variation is mitigated, and mooring line tensions remain within a controllable range. This mooring radius achieves an optimal trade-off among platform motion performance, mooring tension safety, and aquaculture stability. Further increasing the mooring radius yields only marginal improvements in motion response and cage volume performance, while causing a notable rise in mooring tension and a sharp decline in system cost-effectiveness. This study provides a theoretical foundation for the design of mooring systems for deep-sea fishery-photovoltaic complementary integrated platforms.