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依据20多个航次的调查资料,简要描述和分析了大鹏湾表层沉积物中8项有害要素多年的平均分布变化及其环境质量变化。结果表明:绝大多数表层沉积物中的有害要素含量在本湾的西部和北部沿岸区域明显偏高,这说明香港和深圳某些渠道的排放对沿岸区域造成了污染。9 a调查期间,香港海区表层沉积物中Pb、Cu、Cr、As和Hg含量的年际变化趋势是下降的,而Zn、Cd和硫化物含量的年际变化趋势是上升的。大鹏湾表层沉积物中有害要素的污染强度顺序是“硫化物>Pb>Cu>Zn>Cr>Cd>As>Hg”。整体而言,大鹏湾中央主区表层沉积物的环境质量仍好,符合I类海洋沉积物质量标准,而在湾的西部和北部沿岸区域表层沉积物的环境质量较差。
Based on the survey data of more than 20 voyages, the average distribution changes and environmental quality changes of eight harmful elements in the surface sediments of Mirs Bay are briefly described and analyzed. The results showed that the content of harmful elements in the vast majority of surface sediments was significantly higher in the western and northern coast areas of the Bay, indicating that the discharge of some channels in Hong Kong and Shenzhen pollutes the coastal areas. During the survey period, the interannual variations of Pb, Cu, Cr, As and Hg contents in surface sediments of Hong Kong Sea decreased while the interannual variations of Zn, Cd and sulfide contents increased. The order of the pollution intensity of the harmful elements in the surface sediments of Mirs Bay is “sulfide> Pb> Cu> Zn> Cr> Cd> As> Hg”. Overall, the environmental quality of surface sediments in the central main area of Dapeng Bay is still good and meets the quality standards for marine sediments of type I, whereas the environmental quality of surface sediments in the western and northern coastal areas of the Bay is poor.