To fully understand the water quality status of the Yuyao section in the Yaojiang River Basin, we utilized the single factor and comprehensive water quality identification index methods, as well as factor analysis in this study. The single factor water quality assessment results showed that the common parameters exceeding the standard in both the wet and dry seasons included dissolved oxygen and total nitrogen, which were inferior to the target water quality grade III by 1–6 grades. The comprehensive water quality order reaching the target grade III was Hutang River (87.5%), Changling River (50.0%), Yaojiang River (43.8%), and Linzhou River (37.5%). The comprehensive water quality in the dry season (90.0% standard-achieving rate) was better than that in the wet season (25.0% standard-achieving rate). These results suggested that the surface runoff might considerably impact water quality. The factor analysis results showed that the basin surveyed in 2018 was mainly polluted by urban sewage and agricultural sources, while the primary pollution source in 2019 was agricultural pollution. Integrated with comprehensive water quality assessment results, in this study, we demonstrated that series of water treatment projects carried out in Yuyao City positively impacted municipal sewage treatment.

Nuclear power generation is being promoted globally as a clean energy source and is one of China’s key tools for addressing carbon peaking and carbon neutrality. The Niushan Island of China was selected as the research area and conducted detailed seasonal surveys at sea to explore the spatial distribution pattern of marine aquaculture around nuclear power project and analyze the potential impact of island nuclear power project construction on major marine aquaculture species. The results showed that, the spatial distribution pattern of mariculture around the Sea Island Nuclear Power Project is closely related to the aquaculture environment and seasonality. The main mariculture activities include Porphyra cultivation, mudflat breeding and ponding aquaculture. The envelope area of suspended sediment greater than 10 mg/L is 13.0565 km2 during the construction of the project, which may have an impact on the Porphyra cultivation. The average half-moon tide 1.0°C temperature rise envelope is 31.30 km2 in summer and 2.64 km2 in winter for the 6×AP1400 nuclear power units. The temperature rise caused by human factors may have an impact on the breeding activities of “Jiluo Sanniu Marine Ranch”.