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The Poyang Lake basin serves as a natural regulator of the Yangtze River's water levels, which is crucial for water retention and purification. This study investigates the long-term temporal and spatial variations in water quality within the Wu Basin of Poyang Lake. Monthly monitoring data from five hydrological stations along the Rao, Xiu, Xinjiang, Gan, and Fu Rivers, connected to Poyang Lake, were utilized. Water quality was assessed using the Canadian Council of Ministers of the Environment Water Quality Index (CWQI) and the British Columbia Water Quality Index (BCWQI). Temporal trends were analyzed using the Mann-Kendall (M-K) trend test and time series analysis methods to explore spatial characteristics. The results include: (1) The CWQI and BCWQI spatial variability within the Wu Basin generally indicates good water quality, with an average evaluation score of 84. The western region exhibits better water quality than the eastern region. (2) Water Quality Index (WQI) values are predominantly influenced by dissolved oxygen (DO), chemical oxygen demand (CODMn), biochemical oxygen demand (BOD5), and ammonia nitrogen (NH3-N). (3) Significant temporal and spatial variations were observed in the Gan, Fu, and Xiu Rivers, while Xinjiang and Rao tributaries showed less pronounced differences. (4) Spatiotemporal disparities in water quality are primarily attributed to rainfall patterns, human activities, and land use. This research provides insights valuable for guiding water pollution control and comprehensive water quality management in the Wu Basin of Poyang Lake.

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Evaluation and Analysis of Water Quality of Five Rivers in Poyang Lake Based on CWQI and BCWQI

  • 会议论文

  • 发表日期：

    2025年

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  • Chao Ji,
  • Hongwei Yin,
  • Jin Qian,
  • Yong Ji

摘要

The Poyang Lake basin serves as a natural regulator of the Yangtze River's water levels, which is crucial for water retention and purification. This study investigates the long-term temporal and spatial variations in water quality within the Wu Basin of Poyang Lake. Monthly monitoring data from five hydrological stations along the Rao, Xiu, Xinjiang, Gan, and Fu Rivers, connected to Poyang Lake, were utilized. Water quality was assessed using the Canadian Council of Ministers of the Environment Water Quality Index (CWQI) and the British Columbia Water Quality Index (BCWQI). Temporal trends were analyzed using the Mann-Kendall (M-K) trend test and time series analysis methods to explore spatial characteristics. The results include: (1) The CWQI and BCWQI spatial variability within the Wu Basin generally indicates good water quality, with an average evaluation score of 84. The western region exhibits better water quality than the eastern region. (2) Water Quality Index (WQI) values are predominantly influenced by dissolved oxygen (DO), chemical oxygen demand (CODMn), biochemical oxygen demand (BOD5), and ammonia nitrogen (NH3-N). (3) Significant temporal and spatial variations were observed in the Gan, Fu, and Xiu Rivers, while Xinjiang and Rao tributaries showed less pronounced differences. (4) Spatiotemporal disparities in water quality are primarily attributed to rainfall patterns, human activities, and land use. This research provides insights valuable for guiding water pollution control and comprehensive water quality management in the Wu Basin of Poyang Lake.