基于PCA的于桥水库富营养化因子分析

为了加强城市供水安全,保障库区饮用水质量,对于桥水库富营养状况及主要影响因素进行深入的分析.根据于桥水库库区的水质监测资料,利用主成分分析的方法对影响富营养化的监测指标如叶绿素a,总氮,总磷,氨氮,高锰酸盐指数等进行分析,10项评价指标通过主成分分析降维到4项,前4个主成分能够解释73.6％的数据内容.在主成分筛选的基础上进一步进行因子分析,并对各因子的空间分布状况进行描述,以期为于桥水库生态管理提供理论依据.结果表明:水温、pH、COD及溶解氧是影响水库水体富营养化的主要驱动因子,水库中心区域的各主成分值最高.

Factor analysis of eutrophication in Yuqiao reservoir based on PCA

Eutrophication status of Yuqiao Reservoir and the main influence factors were analyzed in order to strengthen the urban water supply safety and ensure the drinking water quality. Based on the method of principal component analysis with water quality monitoring data of Yuqiao reservior, the indicators that influence eutrophication such as chlorophyll a, total nitrogen, total phosphorus, ammonia nitrogen, potassium permanganate index were analyzed to reduce dimensions from 10to 4and the former 4principal components can explain 73.6% of the whole data. On the basis of main components screening the factor analysis were further carried out, and the space distribution of every factor was also described in order to provide the theory basis for Yuqiao Reservoir ecological management. Results show that the water temperature, PH, COD and dissolved oxygen are the main driving factors which influence reservoir eutrophication, and the principal components have the highest value in the central area of the reservoir.