Abstract
The water quality status, spatial and temporal change processes, and water environment improvement process of urban rivers are valuable lessons to be learned under the sustainable development strategy. This study aims to reveal the water environment improvement process of intensively developed urban rivers, elucidate the spatial and temporal distribution characteristics of major pollutants, and provide recommendations for their water environment management. Water quality data from eight monitoring sites (2007–2020) in the Longgang River basin in Shenzhen, China, and comprehensive pollution index method (CPI), modified comprehensive pollution index method (M-CPI), and Pearson correlation analysis method were used for comprehensive analysis. The study shows that TN, TP, NH3-N, and COD have the greatest influence on the water quality of Longgang River, with the average pollution contribution of 53.39%, 14.49%, 11.66%, and 4.92%, in order. In 2015–2020, the water quality of the main stream of the Longgang River in the wet season was worse than that in the dry season, while the water quality of the tributaries Dingshan River and the Huangsha River in the dry season was worse than the wet season. The spatial distribution characteristics based on M-CPI indicate that the water quality of the lower reaches of Longgang River, the tributaries Dingshan River and Huangsha River, is relatively poor. In addition, the water environment improvement process of Longgang River can be divided into 3 stages: engineering stage (2007–2013, rating changed from heavily polluted to basically qualified), bottleneck stage (2013–2017, rating fluctuated slightly above and below basically qualified), and ecological restoration stage (2017–2020, rating reached qualified in 2019).
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The authors would like to thank the anonymous reviewers for their valuable comments and suggestions.
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This study was funded by the National Natural Science Foundation of China (No. 91951108, No. 21976197, and No. 42076155), Major Science and Technology Program for Water Pollution Control and Treatment (2015ZX07206), and the Key R&D plan of Ningxia Hui Autonomous Region (2019BFG02032).
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Xupo Zhang: conceptualization, methodology, formal analysis, investigation, visualization, and writing—original draft and writing—reviewing and editing; Gong Cheng: investigation, resources; Shengjun Xu: conceptualization, resources, and writing—reviewing and editing and supervision; Yeliang Bi: formal analysis and resources; Cancan Jiang: methodology and reviewing and editing; Shuanglong Ma: writing—reviewing and editing; Dongsheng Wang: formal analysis and resources; Xuliang Zhuang: funding acquisition and writing—reviewing and editing and supervision. The authors have read and approved the final draft of the manuscript.
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Zhang, ., Cheng, G., Xu, S. et al. Temporal and spatial changes of water quality in intensively developed urban rivers and water environment improvement: a case study of the Longgang River in Shenzhen, China. Environ Sci Pollut Res 30, 99454–99472 (2023). https://doi.org/10.1007/s11356-023-28995-8
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DOI: https://doi.org/10.1007/s11356-023-28995-8