| 2004年以来长江中下游干流水体高锰酸盐指数时空变化分析 |
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| 引用本文： | 兰静,吴云丽,娄保锋,王瑞琳,陈杰,卓海华.2004年以来长江中下游干流水体高锰酸盐指数时空变化分析[J].湖泊科学,2021,33(4):1112-1122. |
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| 作者姓名： | 兰静 吴云丽 娄保锋 王瑞琳 陈杰 卓海华 |
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| 作者单位： | 生态环境部长江流域生态环境监督管理局生态环境监测与科学研究中心,武汉430010 |
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| 基金项目： | 国务院三峡工程建设委员会办公室三峡水库运行维护管理资金项目（JJ2015-008）资助. |
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| 摘 要： | 高锰酸盐指数是我国水环境质量评价和污染控制考核的重要指标，其浓度高低能反映水体受到有机物污染的严重程度.2003年三峡水库投入运行后，长江中下游干流水文情势发生了重大变化.为此，研究了长江中下游干流耗氧有机污染物的典型参数——高锰酸盐指数的时空变化特征.结果表明，长江中下游干流水体：2004年以来，高锰酸盐指数总体趋降，且目前已处于较低水平并趋于稳定；不同江段和水期高锰酸盐指数变化趋势不一致；耗氧有机污染物以溶解态为主，且溶解态所占比例沿程趋于降低，南津关、汉口、吴淞口下23 km断面溶解态占比中位值分别为0.862、0.734和0.598；可沉降颗粒物对水体中高锰酸盐指数浓度影响较低，尤其在研究河段上游段，悬浮颗粒中所含耗氧物质占总量比例中位值分别为0.138、0.266和0.402；上游江段水体同一监测断面不同测线和测点间高锰酸盐指数测定值差异不显著；河口段则存在显著差异，尤其是表层和底层之间；沿江城市江段近岸水域水体中耗氧物质污染程度较低，其澄清样中高锰酸盐指数均值在1.91～3.45 mg/L之间，仅局部城市江段和水期出现值高于6.0 mg/L的现象.
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| 关 键 词： | 长江中下游 干流 高锰酸盐指数 时空变化 |
| 收稿时间： | 2020/5/24 0:00:00 |
| 修稿时间： | 2020/8/4 0:00:00 |
Spatiotemporal change analysis of permanganate index in the middle and lower mainstem of the Yangtze River since 2004 |
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| Lan Jing,Wu Yunli,Lou Baofeng,Wang Ruilin,Chen Jie,Zhuo Haihua.Spatiotemporal change analysis of permanganate index in the middle and lower mainstem of the Yangtze River since 2004[J].Journal of Lake Science,2021,33(4):1112-1122. |
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| Authors: | Lan Jing Wu Yunli Lou Baofeng Wang Ruilin Chen Jie Zhuo Haihua |
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| Institution: | Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecological Environment, Wuhan 430010, P. R. China |
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| Abstract: | Permanganate index (CODMn) is an important parameter for water quality assessment and pollution control supervision in China. Its concentration reflects the severity of organic pollution. Since the Three Gorges Reservoir was put into operation in 2003, the hydrological condition of in the middle and lower Yangtze River mainstem has been changed significantly. Therefore, the characteristics of spatiotemporal distributions of organic substances(OS) corresponding to permanganate index in the middle and lower mainstem of the Yangtze River under new hydrological condition were studied. The results show that in the middle and lower reaches of the Yangtze River: Since 2004, CODMn has been decreasing generally, and it is currently at a low level and tends to stabilize. The trend of CODMn in the different river sections and the water period is inconsistent. OS(CODMn) in the water column are mainly in the dissolved state, and the proportion of the dissolved state tends to decrease along the direction from upstream to downstream. The median values of Cclarified/Coriginal ratio in Nanjinguan, Hankou and 23 km below Wusongkou, are 0.862, 0.734 and 0.598 respectively. The effect of the precipitable particles on the CODMn concentration in the water is low, especially in the upstream section. The median values of (1-Cfiltered/Coriginal) ratios in Nanjinguan, Hankou and 23 km below Wusongkou were 0.138, 0.266 and 0.402, respectively. There is no significant difference between the different lines and measuring points in the transverse profile in the section on upstream end of studied reach, but significant difference in the estuary section, especially between the surface layer and the bottom layer in the vertical direction. Oxygen-consumed organic pollution is not serious in the coastal waters of urban reaches, and the average concentration of CODMn of the clarified samples is between 1.91 and 3.45 mg/L, and the concentration value is seldom higher than 6.0 mg/L. |
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| Keywords: | Middle and lower reaches of the Yangtze River mainstem permanganate index spatiotemporal change |
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