为深入了解沱江经过综合治理取得的成效,选择沱江流域水质由好变差的冬春交替转折期,对沱江流域16个国考断面和1个背景断面(对照省控断面),基于全流域2016—2019年2月份监测结果,采用WQImin法,选择pH值、溶解氧、总磷、总氮、氨氮、高锰酸盐指数和电导率7个参数,对比分析了2016—2019年冬春交替期沱江流域水质变化;采用综合水质指数法,分析了各断面参评参数污染贡献率。结果表明:2016—2019年,冬春交替期沱江流域水质不断改善,2019年已消除极差水质断面,总磷污染在上游得到有效控制,但全流域总氮污染突出,背景断面水质污染问题已呈现,沱江流域特别是下游治理重点应在生活污水和农业面源的控制上。 研究结果为沱江流域后续污染治理、 打赢“长江大保护”攻坚战和保护长江上游生态屏障提供科学依据。
Abstract
The aim of this research is to further investigate the effectiveness of comprehensive governance and policy implementation for the Tuojiang River. According to monitorings at sixteen state-control sections and one background reference point in February from 2016 to 2019 , the water quality of Tuojiang River Basin in Winter and Spring Alternate (WSA) was compared and analyzed by using WQImin method. Seven parameters including pH value, dissolved oxygen (DO), total phosphorus (TP), total nitrogen (TN), ammonia nitrogen (NH3-N), permanganate index (CODMn) and electrical conductivity (EC) were selected for comparative analysis. The contribution rate of each parameter was also examined by using comprehensive water quality index method. Results revealed an ever-increasing water quality in the WSA from 2016 to 2019 in Tuojiang River Basin: sections of extremely inferior water quality were eliminated in 2019; total phosphorus pollution has been effectively controlled in the upstream. Nevertheless, total nitrogen pollution was prominent across the whole basin, and water pollution in the background sections has emerged. Controlling domestic sewage and agricultural non-point source pollution should be the focus of treatment of Tuojiang River Basin, especially the downstream.
关键词
水质评价 /
差异分析 /
最少指标水质指数(WQImin)法 /
综合水质指数法 /
沱江流域 /
冬春交替
Key words
water quality /
assessment /
difference analysis /
Tuojiang River Basin /
winter and spring alternate
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基金
沱江流域高质量发展研究中心课题(TJGZL2020-09)
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