青岛海洋倾倒区疏浚物海上倾倒试验分析

Analysis on the Dumping Test of Dredged Materials in the Qingdao Ocean Dumping Area

根据2012-10青岛海洋倾倒区水质监测数据,采用单因子质量指数法对该倾倒区的水质进行评价。通过海上倾倒试验,了解倾倒疏浚物在该倾倒区周边海域的悬浮物扩散特征,试验结果表明：位于青岛文昌鱼水生野生动物自然保护区的部分监测站位无机氮、磷酸盐、铜、铅、镉超过GB 3097-1997《海水水质标准》中第一类水质标准,其他站位各监测因子符合GB 3097-1997《海水水质标准》中第二类水质标准;在落潮流时,倾倒疏浚物造成倾倒区周边海域悬浮物含量暂时升高,持续时间约30~50min。疏浚物倾倒后形成的云团在海流作用下向东北方向漂移,主要对青岛文昌鱼水生野生动物自然保护区西北部海域产生暂时影响,疏浚物倾倒造成水体悬浮物含量增高的影响距离为顺流方向2.9km。

Based on the water quality data monitored in the Qingdao Ocean Dumping Area in October 2012,the quality of seawater in the dumping area is evaluated by using single-factor quality index method.In order to know the dispersion characters of the dredged materials dumped in the Qingdao Ocean Dumping Area,a dumping test is made on the sea.The results from the test indicate that at some of the monitoring stations in the Qingdao Amphioxus Aquatic Wild Animal Nature Reserve the contents of inorganic nitrogen,phosphate,copper,lead and cadmium are all in excess of the water quality of Grade 1specified in The Chinese National Standard of Sea water Quality（GB 3097-1997）.At other stations,all the monitoring factors can reach the water quality of Grade2 specified in GB 3097-1997.During the ebb tide,the content of suspended matter caused by dumping dredged materials increases temporarily in the sea area surrounding the Qingdao Ocean Dumping Area,with a duration being about 30~50 min.A silty cloud cluster generated after the dumping of dredged materials drifts northeastward under the action of ocean current,which causes a temporary effect in the northwestern part of the Qingdao Amphioxus Aquatic Wild Animal Nature Reserve.The influencing distance of the increase of suspended matter caused by the dumping of dredged materials is2.9km in the downstream direction.