Spatial-Temporal Variation in Water Quality and Analysis on Pollution Sources in Rivers in Megacities:A Case Study of Chengdu
The spatial-temporal variation trend and pollution characteristics of the water environment in Chengdu Basin were elaborated and analyzed in this paper with the main stream in Chengdu as an example,which provided a basis for decision-making on ecological and environmental protection in megacities.Based on the monthly data on 22 indicators in 75 monitoring sections of the Chengdu Basin from 2011 to 2020,the author adopted the Nemerow pollution index method and SOM clustering method to study the water quality and spatial-temporal variation characteristics of rivers in Chengdu,and analyzed its potential sources of pollution through multivariate statistical analysis method.The results showed that among the 75 monitoring sections,45 sections were"clean",5 sections were"relatively clean",1 section was"slightly polluted",21 sections were"moderately polluted",and no sections were"heavily polluted".During the 12th Five-year Plan period,the proportion of polluted sections was about 36.9％.While during the 13th Five-year Plan period,the proportion of polluted sections decreased from 43.0％to 2.7％,which indicated that great improvement had been made in the management and governance of water environments in Chengdu.The 610 monitoring sections in this study could be divided into 8 groups.The water quality in the middle and lower reaches was generally poor and varied greatly,with CODMn,CODCr,BOD5,NH3-N and TP as the main pollutants in the study area.The water quality of rivers in Chengdu was deeply disturbed by human activities.The pollution caused by agricultural pollutants,domestic sewage and wastewater from livestock and poultry breeding is an important problem to be addressed,to continuously improve the water environment in Chengdu.
万方数据
维普
