The construction of artificial islands not only alleviates the shortage of coastal land resources but also brings new environmental problems. This study focuses on the fundamental changes in the hydrodynamic environment and sediment transport caused by the construction of artificial islands, leading to imbalances in sediment distribution and beach erosion. This article takes the coast of Riyue Bay in Hainan Province, China, as an example and uses various methods such as field surveys and model experiments to explore the evolutionary mechanism of beach landforms under the influence of artificial islands. Based on this, an adaptive “cyclic maintenance” beach restoration plan is proposed. Reasonable distribution of beach sediment is achieved through experimental verification, effectively mitigating the coastal erosion caused by the construction of artificial islands. The expected goals were achieved after 2 years of implementation of the on-site restoration project. The results of this research not only solve practical engineering problems but also provide a good reference for the restoration of similar types of coastal beaches.

With the development and utilization of offshore wind turbines in the field of existing breakwaters, its foundation is affected by the dual effects of waves and different structures. In order to ensure structural safety and evaluate the impact on breakwaters, A6 and A7 wind turbine foundations in the breakwater head area were selected, and a 1:40 scale model test was conducted. The results showed the following: (1) After the implementation of the wind turbine project, the wave height of the breakwater only increased by 10%, and its stability was basically not affected; (2) The basic design elevation does not meet the requirements for run-up, and it is feasible to raise it by 1.0~1.5 m; (3) The wave force on A7 foundation is 2~4 times that of A6, and after the elevation is raised, the wave force decreases by 50%. Therefore, the structural design can be considered to adopt differentiated design according to different positions and types; (4) The experimental results are 1.2~1.5 times the standard formula calculation results, and the research results can enrich the current standard calculation basis. This study can not only solve practical problems in engineering but also provide basic data for similar projects in the future.