疏浚物倾倒对岚山港临时海洋倾倒区周边海域环境影响的研究

为了解疏浚物倾倒对岚山港临时海洋倾倒区周边海域生态环境造成的影响，采用单因子质量指数法和综合指数法对该倾倒区周边海域海水和沉积物历年跟踪监测结果进行评价，并对该倾倒区周边海域海洋生物以及水深的变化情况进行分析。结果表明：该倾倒区周边调查海域历年水质质量符合《海水水质标准》（GB 3097—1997）中第二类水质标准，除无机氮外，其他各评价因子的质量指数较为稳定，基本在一定的范围内波动；沉积物质量符合《海洋沉积物质量》（GB 18668—2002）中第一类海洋沉积物质量标准，沉积物各评价因子质量指数均在小范围内波动；疏浚物的倾倒对该倾倒区海域浮游植物种类数和密度造成暂时性的减少；疏浚物的倾倒造成倾倒区东部和北部海底各形成一个明显的凸起地形。可见除倾倒区的水深受到影响外，疏浚物的倾倒尚未对该倾倒区海域生态环境质量造成明显影响。

Study on the impact of dumping dredged materials on Lanshan Port Temporary Ocean Dumping Site surrounding sea environment

In order to find out the impact of dumping dredged materials on Lanshan Port Temporary Ocean Dumping Site areas, with the methods of single factor index and eutrophication index,we evaluated the monitoring data of the seawater and sediments quality over years, and analysed the changes of marine biology and the water depth. The results show that the water quality of the investigated areas reached the second class water quality from The Chinese National Standard of Seawater Quality. In addition to inorganic nitrogen, other quality indices of the evaluation factors are generally more stable, fluctuate within a certain range. The sediment quality of the investigated areas reached the first class sediment quality from The Chinese National Standard of Sediment Quality, and the sediment quality indices of the evaluation factors fluctuate within a small range. Dumping dredged materials caused a temporary reduction in the total density and the total number of phytoplankton species. At the same time dumping dredged materials caused an obvious raised topography in the north and east area of the Lanshan Port Temporary Ocean Dumping Site. The results show that except the water depth had been impacted, the dumping of dredged materials has not caused significant impact on the ecological environmental quality of Lanshan Port Temporary Ocean Dumping Site areas.