摘要
以浏阳河梨、黑石渡和三角洲断面不同时期的水体为研究对象,根据相关系数矩阵选取指标,并考虑评价因子之间的相互作用,利用主成分分析为水体评价因子赋权,对断面水体质量进行模糊综合评价。结果表明:浏阳河梨、黑石渡三角洲断面主要污染因子为COD、NH3-N、TP、Se、Hg、Cr^6+,且CODMn、COD、BOD5、NH3-N等评价因子具有较强相关性。浏阳河下游3个断面中梨的水质最优,各时段评级均稳定在Ⅰ级。黑石渡、三角洲断面枯水期水污染较为严重,处于Ⅳ级。将主成分分析法评价结果与熵权法、单因子评价法进行对比,主成分分析法较单因子评价法的评价结果更为客观,较熵权法可以通过合理降维减轻评价过程计算量,利用主成分分析法进行水质评价具有可行性。
Taking the water bodies of Liuyang River at Langli section,Heishidu section and Sanjiaozhou section as the research objects,the indexes were selected according to the correlation coefficient matrix,and the interaction between the evaluation factors was considered.The principal component analysis was used to weigh the water body evaluation factors,and the water quality of the section was evaluated by fuzzy comprehensive evaluation.The results showed that the main pollution factors in the section of Liuyang River at Langli section,Heishidu section and Sanjiaozhuo section were COD,NH3-N,TP,Se,Hg and Cr^6+.At the same time,the evaluation factors such as CODMn,COD,BOD5 and NH3-N had strong correlation.Among the three sections in the lower reaches of Liuyang River,the water quality of Langli section was the best,and the grade of Langli section was stable at grade I in each period.The water pollution of Heishidu and Sanjiaozhuo section was more serious in dry season,which was in grade IV.Comparing the results of principal component analysis with those of entropy weight method and single factor evaluation method,the results of principal component analysis were more objective than that of single factor evaluation method.Compared with entropy weight method,the calculation amount of evaluation process can be reduced by reducing dimension reasonably.It is feasible to use principal component analysis method to evaluate water quality.
作者
李虹宇
邢宏霖
LI Hong-yu;XING Hong-lin(College of Information Science and Technology,Hunan Agricultural University,Changsha 410128,PRC;Environmental Monitoring Station of Hunan Province,Changsha 410014,PRC)
出处
《湖南农业科学》
2019年第8期56-60,共5页
Hunan Agricultural Sciences
基金
湖南省自然科学基金资助项目(2016JJ5015)
2016年湖南省环境与健康项目(湘财建指〔2016〕49号)
关键词
浏阳河
水质监测
主成分分析
模糊综合评价
Liuyang River
water quality monitoring
principal component analysis
fuzzy comprehensive evaluation
