摘要
从流域尺度研究黔南州重安江水环境质量变化特征,分析流域水环境现状。结果表明:黔南州重安江流域水质在2018年前总体较差,干流除黑塘桥断面外均在2018年消除劣Ⅴ类水体,支流五里桥断面水质在2019年达到Ⅲ类,川恒公司排口下游断面水质在2020年达到Ⅲ类,流域水环境时空异质性显著,上游水质总体优于下游。从超标污染物来看,均为总磷超标,另外部分断面氟化物超标,2015年凤山桥边断面总磷浓度最高,达到17.3 mg/L。根据流域各污染源负荷分析可知,60.41%总磷污染来自畜禽养殖。根据水资源利用情况分析可知,农业面源污染是流域水污染的主要来源。针对流域水环境现状提出持续推进重点污染源治理工程、加强水生态修复与治理措施、加强重安江流域水环境联防联控等流域综合治理措施。
The change characteristics of water environmental quality of Chong'an River Basin in Qiannan Prefecture were studied at the watershed scale,and the water environmental status of the watershed was comprehensively analyzed.The results showed that the water quality of Chong'an River Basin in Qiannan Prefecture was generally poor before 2018.For the trunk stream,except for the section of Heitang Bridge,all other sections eliminated the water body inferior to GradeⅤin 2018.In terms of tributaries,Wuliqiao section was better than GradeⅢin 2019,and the downstream of Chuanheng's outfall section was better than GradeⅢin 2020.The results showed a pronounced spatiotemporal heterogeneity of water environment quality,and the water quality in the upstream was overall better than that in the downstream.In terms of pollutants,total phosphorus in all the sections and fluoride in some sections exceeded the standard.In 2015,the total phosphorus in Fengshan bridge section was the highest with 17.3 mg/L.The analysis showed that agricultural sources contributed the most to the water environment pollution in the basin.In the end,the comprehensive management measures for the basin were put forward,such as continuously promoting key pollution source control projects,strengthening water ecological restoration and control measures,and strengthening joint prevention and control of water environment in Chong'an River basin.
作者
马欢
计伟
冯朝阳
李付杰
姜程
宋婷
杨娇
MA Huan;JI Wei;FENG Chaoyang;LI Fujie;JIANG Cheng;SONG Ting;YANG Jiao(Chinese Research Academy of Environmental Sciences;State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment,Chinese Research Academy of Environmental Sciences;Qiannan Prefecture Environmental Protection Bureau)
出处
《环境工程技术学报》
CSCD
北大核心
2022年第2期477-484,共8页
Journal of Environmental Engineering Technology
基金
长江生态环境保护修复联合研究项目(第一期)(2019-LHYJ-01)。
关键词
黔南州
长江流域
重安江
水环境
成因分析
Qiannan Prefecture
Yangtze River Basin
Chong'an River
water environment
causes analysis
