珠江广州城区河段主要污染物变化特征及原因分析

Variation Characteristics and Correlation Analysis of Main Pollutants in Guangzhou Urban Reach of the Pearl River

为探索研究感潮河段城市上下游断面污染物变化趋势和相关性,基于珠江广州城区河段4个代表断面2011—2021年水质监测资料,采用时间过程线、Mann-Kendall趋势分析法、Pearson积矩相关系数、Spearman和Kendall秩相关系数等方法进行了分析研究。结果表明,①NH 3-N和TP是珠江广州城区河段两项主要的污染物。②时间分布上,2018年前NH 3-N、TP的污染严重,2018年起有明显好转,与广东全面推行河长制时间吻合。③空间分布上,广州主城区S1、S2、S3的NH 3-N、TP污染程度比主城区下游的S4明显严重。④上下游断面相关性上,S1、S2、S3的NH 3-N、TP变化趋向基本一致,相关关系显著。

In order to explore and study the variation trend and correlation of pollutants in the urban upstream and downstream sections of the tidal river reach,based on the water quality monitoring data of 4 representative sections of the Pearl River reach in Guangzhou urban area from 2011 to 2021,Time process line,Mann-Kendall trend analysis,Pearson product moment correlation coefficient,Spearman rank correlation coefficient and Kendall rank correlation coefficient were used to analyze and study.The results show that①NH 3-N and TP are the two main pollutants in the Guangzhou urban reach of the Pearl River.②In terms of time distribution,the pollution of NH 3-N and TP was serious before 2018,and has been significantly improved since 2018,which is consistent with the full implementation of the river length system in Guangdong.③In terms of spatial distribution,the NH 3-N and TP pollution of S1,S2 and S3 in the main urban area of Guangzhou is significantly more serious than that of S4 in the downstream of the main urban area.④In the correlation of upstream and downstream sections,the changes of NH 3-N and TP in S1,S2 and S3 tend to be basically the same,and the correlation is significant.