盐城市河道水质时空分布特征分析

Analysis of Spatial-Temporal Distribution Characteristics of River Water Quality in Yancheng City

为了解盐城市2022年河道水质时空分布特征,本文整理了122条骨干河道的水质监测数据,采用水质标识指数、多元统计分析、GIS空间分析相结合的方法研究其时空特征及驱动因子。结果表明,2022年综合水质标识指数(WQI)优于(含)Ⅲ类水的占比为95.5%,高锰酸盐指数、总磷为主要污染因子,以点源和面源污染为主的断面占比分别为21.9%和36.8%。WQI具有较为显著的空间聚集特征。水质受农田灌溉、畜牧养殖、地表径流污染影响较为明显。建议监控上游来水、控制农业面源污染和着重关注东台、射阳、建湖的水环境治理。

In order to understand the spatial-temporal distribution characteristics of river water quality in Yancheng City in 2022,this paper collects and compiles water quality monitoring data from 122 main river channels.It employs water quality index(WQI),multivariate statistical analysis,and GIS to study their spatial-temporal characteristics and driving factors.The results indicate that in 2022,the proportion of WQI superior to or equal to Class III water quality standards is 95.5%.Permanganate index and total phosphorus are the main pollutants,with point and non-point source pollution accounting for 21.9% and 36.8% of the sections,respectively.WQI exhibits significant spatial clustering characteristics.Water quality is significantly affected by agricultural irrigation,livestock farming,and surface runoff pollution.It is recommended to monitor upstream inflows,control agricultural non-point source pollution,and focus on water environmental governance in Dongtai,Sheyang,and Jianhu.