Evaluation of Water Quality Pollution Status and Analysis of Pollution Characteristics in the National Control Section of Nanwan River Diesa
In order to evaluate the water pollution status of Nanwan River and analyze its changing characteristics,the national control section of Diesa in Nanwan River was selected as the research object.The water quality was monitored monthly from 2013-2018,and three methods were used to evaluate the water quality:single factor evaluation method,comprehensive pollution index method,and Nemero pollution index method.The results show that the 6-year average evaluated by the single factor evaluation method meets the Class Ⅱ water quality requirements of the Surface Water Environmental Quality Standard(GB 3838-2002),and the overall water quality meets the standard,with some years exceeding the standard;the 6-year average concentration corresponds to the comprehensive pollution index index P=0.33,indicating that the comprehensive water quality detection value of the national control section of the Nanwan River is within the standard,and some projects are close to or exceed the standard;the 6-year average concentration corresponds to the Nemero comprehensive pollution index PN=0.70,2015 and 2018PN>0.7.The rank correlation coefficient method was used to analyze the temporal variation pattern of water quality,and the results showed that the comprehensive water quality was relatively stable during the evaluation period.Based on the precipitation situation,this study explores the impact of climate on water quality.The results show that there is a significant correlation between CODMn,Tp,Cu,Zn and precipitation.
water quality evaluationchanging characteristicsclimate impactnanwan river cascade section
NETL
NSTL
万方数据
维普
