基于灰色聚类的威海双岛湾海域富营养化水平评价

Evaluation of Seawater Eutrophication in Coastal Weihai,Shuangdao Bay Based on Grey Clustering Method

依据2012年6月山东省威海市双岛湾海水水质调查结果,采用灰色聚类法选取溶解氧、化学需氧量、无机氮、活性磷酸盐和叶绿素a作为聚类指标,对双岛湾富营养化水平进行评价。结果表明,双岛湾南部海域呈现富营养化,中部为中营养水平,北部为贫营养水平。这与双岛湾的地理特点、周边陆源入海排污、池塘养殖活动密切相关。通过与营养状态质量法和营养指数法进行比较,确认灰色聚类法更适用于海湾富营养化评价。

The eutrophication levels were assessed on dissolved oxygen , chemical oxygen demand , inorganic nitrogen ,phosphate and chlorophyll a data collected in coastal Weihai ,Shuangdao Bay ,in June of 2012 ,by a grey cluster method .The results showed that the southern Shuangdao Bay was characterized by eutrophication ,the center Shuangdao Bay by medium-level nutrient ,and the northern Shuangdao Bay by oligotrophication ,which was attributed to the geographic feature of the Bay ,the sea pollution ,and aquaculture activity .It was found that the grey clustering method was more suitable for evaluation of the seawater eutrophication compared with the nutrition condition performance and nutrient index .