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The Risk of Water Quality Deterioration with Urban Flood Control—A Case in Wuxi

Author

Listed:
  • Pan Hu

    (College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China)

  • Lan Feng

    (College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
    Ecological Complexity and Modeling Laboratory, Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA)

Abstract

There is a demand for flood control in densely populated river network areas. Therefore, small floodgates are used for long-term and rapid water flow regulation in such contexts. However, people often disregard these floodgates’ potential interference with the natural water environment. This study focused on an urban floodgate-controlled reach and monitored the monthly data of four main pollutant indicators (TN, TP, COD Mn , and NH 3 -N) from 2016 to 2018 at six fixed sampling points (S1–S6). The difference analysis and cluster analysis results indicated that floodgate adjustments were the dominant driving factor of water quality changes in the reach, with pollutant concentration differences observed between the floodgate opening and closing periods. The results of the Canadian Council of Ministers of the Environment Water Quality Index evaluation showed that the water quality of the floodgate-controlled reach was categorized as “marginal” or “poor”. It is particularly important to note that the concentration of nitrogen compounds exceeded the allowable limits. The results of the Mann–Kendall trend and time series analyses revealed an overall upward trend in NH 3 -N concentration and a localized upward trend in TP concentration and presented periodic concentration fluctuations of four pollutants (TN, TP, COD Mn , and NH 3 -N). This study highlights that flood control management using small floodgates can pose a risk of deteriorating water quality. Therefore, it is necessary to develop scientific water quality management methods.

Suggested Citation

  • Pan Hu & Lan Feng, 2023. "The Risk of Water Quality Deterioration with Urban Flood Control—A Case in Wuxi," Sustainability, MDPI, vol. 16(1), pages 1-15, December.
    • Handle: RePEc:gam:jsusta:v:16:y:2023:i:1:p:185-:d:1307010
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    References listed on IDEAS

    as
    1. Xuan Zhang & Changling Fang & Yuan Wang & Xiaoyi Lou & Ying Su & Dongmei Huang, 2022. "Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas," Sustainability, MDPI, vol. 14(10), pages 1-16, May.
    2. Lei Tang & Xiangdong Pan & Jingjie Feng & Xunchi Pu & Ruifeng Liang & Ran Li & Kefeng Li, 2019. "Experimental Investigation on the Relationship Between COD Degradation and Hydrodynamic Conditions in Urban Rivers," IJERPH, MDPI, vol. 16(18), pages 1-12, September.
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