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Dec 2020
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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  42(10): 59-69.
Qu Baoxiao，Song Jinming，Yuan Huamao. Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay[J]. Haiyang Xuebao，2020, 42(10)：59–69 doi: 10.3969/j.issn.0253-4193.2020.10.006
Citation: Qu Baoxiao，Song Jinming，Yuan Huamao. Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay[J]. Haiyang Xuebao，2020, 42(10)：59–69 doi: 10.3969/j.issn.0253-4193.2020.10.006
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Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay

doi: 10.3969/j.issn.0253-4193.2020.10.006
  • Received Date: 05 Jul 2019
  • Rev Recd Date: 17 Sep 2019
  • Publish Date: 07 Dec 2020
    Abstract
  • The metal contents in the core sediments collected from the Daya Bay, a typical marine environment in the Guangdong-Hong Kong-Macao Greater Bay Area were measured in this study. National standard for marine sediment quality and fuzzy comprehensive assessment were applied to evaluate the historical evolution of the sediment quality in the past one hundred years. Our results indicate that the metal contamination in the bay experienced three major stages: (1) Before 1980s, the concentrations of most metals were low and the sediment quality fell into the category of class I. Accordingly, the metal risk was low in this period. Cr contributed most and Cd contributed least to the risk, respectively. (2) Between 1980 and 2000, the metal contents were significantly higher than the background values, suggesting that there was a sharp increase of metal input. The category of sediment quality fell down to class II and class III. However, the sediments in the margin areas of the Daya Bay were only slightly affected and still belonged to class I quality. Cu acted as a major metal pollutant instead of Cr in this period. (3) After the year of 2000, the metal levels and the metal risk decreased sharply. The sediment quality recovered back to class I and Cr contributed most to the risk at the time.

     

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