Identification of long-term trends and seasonality in high-frequency water quality data from the Yangtze River basin, China
Comprehensive understanding of the long-term trends and seasonality of water quality is important for controlling water pollution. This study focuses on spatio-temporal distributions, long-term trends, and seasonality of water quality in the Yangtze River basin using a combination of the seasonal Ma...
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| creator | Duan, Weili He, Bin Chen, Yaning Zou, Shan Wang, Yi Nover, Daniel Chen, Wen Yang, Guishan |
| description | Comprehensive understanding of the long-term trends and seasonality of water quality is important for controlling water pollution. This study focuses on spatio-temporal distributions, long-term trends, and seasonality of water quality in the Yangtze River basin using a combination of the seasonal Mann-Kendall test and time-series decomposition. The used weekly water quality data were from 17 environmental stations for the period January 2004 to December 2015. Results show gradual improvement in water quality during this period in the Yangtze River basin and greater improvement in the Uppermost Yangtze River basin. The larger cities, with high GDP and population density, experienced relatively higher pollution levels due to discharge of industrial and household wastewater. There are higher pollution levels in Xiang and Gan River basins, as indicated by higher NH4-N and CODMn concentrations measured at the stations within these basins. Significant trends in water quality were identified for the 2004-2015 period. Operations of the three Gorges Reservoir (TGR) enhanced pH fluctuations and possibly attenuated CODMn, and NH4-N transportation. Finally, seasonal cycles of varying strength were detected for time-series of pollutants in river discharge. Seasonal patterns in pH indicate that maxima appear in winter, and minima in summer, with the opposite true for CODMn. Accurate understanding of long-term trends and seasonality are necessary goals of water quality monitoring system efforts and the analysis methods described here provide essential information for effectively controlling water pollution. |
| doi_str_mv | 10.1371/journal.pone.0188889 |
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This study focuses on spatio-temporal distributions, long-term trends, and seasonality of water quality in the Yangtze River basin using a combination of the seasonal Mann-Kendall test and time-series decomposition. The used weekly water quality data were from 17 environmental stations for the period January 2004 to December 2015. Results show gradual improvement in water quality during this period in the Yangtze River basin and greater improvement in the Uppermost Yangtze River basin. The larger cities, with high GDP and population density, experienced relatively higher pollution levels due to discharge of industrial and household wastewater. There are higher pollution levels in Xiang and Gan River basins, as indicated by higher NH4-N and CODMn concentrations measured at the stations within these basins. Significant trends in water quality were identified for the 2004-2015 period. Operations of the three Gorges Reservoir (TGR) enhanced pH fluctuations and possibly attenuated CODMn, and NH4-N transportation. Finally, seasonal cycles of varying strength were detected for time-series of pollutants in river discharge. Seasonal patterns in pH indicate that maxima appear in winter, and minima in summer, with the opposite true for CODMn. Accurate understanding of long-term trends and seasonality are necessary goals of water quality monitoring system efforts and the analysis methods described here provide essential information for effectively controlling water pollution.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0188889</identifier><identifier>PMID: 29466354</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Analysis ; Basins ; Biogeochemistry ; Canyons ; China ; Demographic aspects ; Discharge ; Earth Sciences ; Ecology ; Ecology and Environmental Sciences ; Engineering and Technology ; Environmental aspects ; Environmental monitoring ; Environmental protection ; Geography ; Laboratories ; Limnology ; Methods ; Nonpoint source pollution ; pH effects ; Physical Sciences ; Pollutants ; Pollution ; Pollution control ; Pollution effects ; Pollution levels ; Population density ; River basins ; River discharge ; River flow ; Rivers ; Seasonal variations ; Seasons ; Sediments ; Social Sciences ; Stations ; Surface water ; Time series ; Trends ; Wastewater ; Wastewater pollution ; Water discharge ; Water pollution ; Water pollution control ; Water Quality ; Water quality management ; Water quality monitoring ; Watersheds</subject><ispartof>PloS one, 2018-02, Vol.13 (2), p.e0188889</ispartof><rights>COPYRIGHT 2018 Public Library of Science</rights><rights>2018 Duan et al. 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This study focuses on spatio-temporal distributions, long-term trends, and seasonality of water quality in the Yangtze River basin using a combination of the seasonal Mann-Kendall test and time-series decomposition. The used weekly water quality data were from 17 environmental stations for the period January 2004 to December 2015. Results show gradual improvement in water quality during this period in the Yangtze River basin and greater improvement in the Uppermost Yangtze River basin. The larger cities, with high GDP and population density, experienced relatively higher pollution levels due to discharge of industrial and household wastewater. There are higher pollution levels in Xiang and Gan River basins, as indicated by higher NH4-N and CODMn concentrations measured at the stations within these basins. Significant trends in water quality were identified for the 2004-2015 period. Operations of the three Gorges Reservoir (TGR) enhanced pH fluctuations and possibly attenuated CODMn, and NH4-N transportation. Finally, seasonal cycles of varying strength were detected for time-series of pollutants in river discharge. Seasonal patterns in pH indicate that maxima appear in winter, and minima in summer, with the opposite true for CODMn. Accurate understanding of long-term trends and seasonality are necessary goals of water quality monitoring system efforts and the analysis methods described here provide essential information for effectively controlling water pollution.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>29466354</pmid><doi>10.1371/journal.pone.0188889</doi><tpages>e0188889</tpages><orcidid>https://orcid.org/0000-0002-1503-8066</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Analysis Basins Biogeochemistry Canyons China Demographic aspects Discharge Earth Sciences Ecology Ecology and Environmental Sciences Engineering and Technology Environmental aspects Environmental monitoring Environmental protection Geography Laboratories Limnology Methods Nonpoint source pollution pH effects Physical Sciences Pollutants Pollution Pollution control Pollution effects Pollution levels Population density River basins River discharge River flow Rivers Seasonal variations Seasons Sediments Social Sciences Stations Surface water Time series Trends Wastewater Wastewater pollution Water discharge Water pollution Water pollution control Water Quality Water quality management Water quality monitoring Watersheds |
| title | Identification of long-term trends and seasonality in high-frequency water quality data from the Yangtze River basin, China |
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