Application of principal component-cluster analysis complex model to water environment management:Case study in Songhua River in Jilin section as an example

Based on the monitoring data from Jilin section in Songhua River,the contribution rate of water pollution factors to Jilin section in Songhua River is calculated quantitatively,and all kinds of water environmentally managed areas are divided rationally with the complex model of the principal component-cluster analysis. According to the assessment results,the corresponding measures of water environment management are put forward. The results show that the main pollutions in Jilin section in Songhua River are volatile phenol,Chemical Oxygen Demand(COD)and Ammonia-nitrogen(NH₃-N),which have their pollution characteristics of organic Pollution and non-point Source Pollution. The results also show that in the seven selected monitoring sections(i.e.,Fengman,Longtanqiao,Hadawan,Shaokou,Jiuzhan,Anda and Baiqi),the water quality in the sections between Fengman and Longtanqiao,Longtanqiao and Shaokou,Shaokou and Baiqi is lighty,heavily and moderately polluted respectively,which means that the water resources in these sections should be preserved,controlled and exerted respectively. The development of the study has certain reference value to gross control of the regional water environment,and can implement the scientificall classified management of the water areas of Songhua River in Jilin Province.