Water environment status and causes analysis of Chong'an River Basin in Qiannan Prefecture
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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。Abstract: 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 Grade Ⅴ in 2018. In terms of tributaries, Wuliqiao section was better than Grade Ⅲ in 2019, and the downstream of Chuanheng's outfall section was better than Grade Ⅲ in 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.
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Key words:
- Qiannan Prefecture /
- Yangtze River Basin /
- Chong'an River /
- water environment /
- causes analysis
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表 1 重安江流域各段面水质变化
Table 1. Changes of water quality in each section in Chong'an River Basin
级别 所属河道 断面名称 控制级别 2015年 2016年 2017年 2018年 2019年 2020年 干流 鱼梁江 黑塘桥 其他 Ⅱ Ⅱ Ⅱ Ⅱ Ⅱ Ⅱ 吴家桥 其他 劣Ⅴ 劣Ⅴ 劣Ⅴ Ⅴ Ⅳ Ⅳ 鸭草坝 其他 劣Ⅴ 劣Ⅴ 劣Ⅴ Ⅳ Ⅲ Ⅲ 凤山桥边 国控 劣Ⅴ 劣Ⅴ 劣Ⅴ Ⅳ Ⅲ Ⅲ 支流 后河 市化肥厂 其他 Ⅳ Ⅳ Ⅲ Ⅳ Ⅲ Ⅲ 川恒上游 其他 Ⅳ Ⅳ Ⅲ Ⅳ 劣Ⅴ Ⅲ 川恒下游 其他 劣Ⅴ 劣Ⅴ Ⅴ 劣Ⅴ 劣Ⅴ Ⅲ 皮拢河 越都取水口 其他 Ⅱ Ⅲ Ⅲ Ⅱ Ⅱ Ⅱ 五里桥 其他 劣Ⅴ 劣Ⅴ 劣Ⅴ 劣Ⅴ Ⅲ Ⅲ 表 2 重安江流域水环境污染入河量负荷及占比
Table 2. Pollution load into the river and proportion of water environmental in Chong'an River Basin
污染物 工业废水 城镇生活污水 农村生活污水 畜禽养殖 种植业 渣场渗漏 污染负荷
合计/t污染负荷/t 占比/% 污染负荷/t 占比/% 污染负荷/t 占比/% 污染负荷/t 占比/% 污染负荷/t 占比/% 污染负荷/t 占比/% 总磷 3.09 4.42 4.22 6.04 2.44 3.49 42.20 60.41 13.83 19.80 4.08 5.84 69.86 总氮 6.63 1.02 97.35 15.04 27.75 4.29 250.38 38.69 264.99 40.95 647.10 氨氮 2.71 0.72 13.05 3.46 22.20 5.89 108.61 28.81 230.42 61.12 376.99 化学需氧量 24.71 0.38 114.95 1.75 91.03 1.39 5187.89 78.95 1152.12 17.53 6 570.70 -
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