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Int J Environ Res Public Health. 2011 Jun;8(6):2352-65. doi: 10.3390/ijerph8062352. Epub 2011 Jun 22.

Investigation of spatial and temporal trends in water quality in Daya Bay, South China Sea.

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  • 1State Key Laboratory of Oceanography in the Tropics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China. mlwu@scsio.ac.cn


The objective is to identify the spatial and temporal variability of the hydrochemical quality of the water column in a subtropical coastal system, Daya Bay, China. Water samples were collected in four seasons at 12 monitoring sites. The Southeast Asian monsoons, northeasterly from October to the next April and southwesterly from May to September have also an important influence on water quality in Daya Bay. In the spatial pattern, two groups have been identified, with the help of multidimensional scaling analysis and cluster analysis. Cluster I consisted of the sites S3, S8, S10 and S11 in the west and north coastal parts of Daya Bay. Cluster I is mainly related to anthropogenic activities such as fish-farming. Cluster II consisted of the rest of the stations in the center, east and south parts of Daya Bay. Cluster II is mainly related to seawater exchange from South China Sea.


Daya Bay; multidimensional scaling analysis; principal component analysis; statistical techniques; water quality

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