基于污染指数和地统计的水体污染评价——以严西湖为例

Evaluation of water pollution based on pollution index and geostatistical analysis:Case study of Yanxi lake

以武汉市严西湖为例,运用单因子污染指数法、综合污染指数法和地数统计分析法对湖泊水环境质量进行综合评价。结果表明,TN、COD是其主要水质限制性指标,而N、P是其主要污染元素,相关性较大;13个采样点位评价均为Ⅳ类、Ⅴ类水体,且湖泊北部、西部污染较为严重;主成分分析法(PAC)提取两个主成分,构建得分系数函数,13个采样点位均超过Ⅲ类水体得分,水体污染可能与周边重工业生产区、湖泊周边农业和渔业有关。

It Based on the Yanxi lake in Wuhan City,evaluating the water quality by using single and comprehen⁃sive pollution index method,geostatistical and statistical analysis method.The results show the TN and The COD are the main restrictive indicators,N and P are the main pollution elements,with a strong correlation;The 13 sampling sites are evaluated as GradeⅣand GradeⅤ,and water pollution in the north and west of the Yanxi lake is almost se⁃rious.The PAC extracts two main factors,getting score coefficient matrix and the scores of 13 sampling sites,which maybe related to the heavy industry production in the northwest of Yanxi lake,the agriculture and fishery industry around the lake.