The models of kelp-cultured rafts from the Yellow Sea and Bohai Sea were taken in this study to provide references for the design and selection of kelp-cultured raft as well as the selection of the cultured location. The model test was conducted in the test tank with a main scale of 90 m × 6 m × 3 m to investigate the hydrodynamic performance of a group of rafts in the longitudinal arrangement and a single raft in the long-line arrangement with and without kelp hanging. Results show that regardless of the longitudinal or long-line arrangement of kelp-cultured rafts, the overall force of the raft increases with the increase of current velocity. The force value of conning kelp-cultured rafts is 9.0%–33.2% higher than that of unconning kelp-cultured rafts under the same external conditions. In addition, it is recommended that the length of each main cable should not exceed 50 meters.
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