WQI Based Water Quality Assessment and Spatial-temporal Variation Analysis in River Network
In order to comprehensively understand the water quality changes of major river networks in Shanghai,a comprehensive water quality identification index(WQI)was used for water quality assessment based on the monthly wa-ter quality monitoring data of 19 water quality monitoring sections of the research area from 2015 to 2020.By using the M-K trend test method,the interannual and intra year changes in regional water quality were analyzed.By comparing the water quality changes of the northern and southern rivers,as well as the upstream,middle,and downstream areas of the main streams,the spatial changes and spatiotemporal differences in the water quality were analyzed.The results show that the overall average WQI of the water quality in the major river networks was 62.32,and the water quality evaluation level was"medium";The WQI value of water quality has significant upward trend;water quality of the southern rivers was better than that of the northern rivers.The WQI of the main stream decreased from upstream to downstream,mean-ing that the water quality got worse along the way.The water quality of the main stream had been better than that of the tributaries on the whole.The research results can provide certain references for water quality assessment,water environ-ment protection and management to similar river network water systems.
comprehensive water quality identification indexwater quality assessmentM-K trend testspatio-tem-poral variation
NETL
NSTL
万方数据
维普
