标题: An improved coupled water quantity-quality-ecology model incorporating diurnal cycle as a key factor affecting algal blooms and application in large rivers

作者: Liu, X (Liu, Xin); Zhang, WS (Zhang, Wanshun); Wang, Y (Wang, Yue); Peng, H (Peng, Hong); Jiang, AN (Jiang, Anna); Li, A (Li, Ao); Zhang, X (Zhang, Xu); Wang, H (Wang, Hao)

来源出版物: JOURNAL OF ENVIRONMENTAL MANAGEMENT  卷: 376  文献号: 124497  DOI: 10.1016/j.jenvman.2025.124497  Published Date: 2025 MAR  

摘要: Diurnal fluctuations in algal growth and decline are essential for understanding the dynamics and predicting algal blooms accurately in large river systems. This study analyzed environmental monitoring data during a spring algal bloom event from February to March 2022 in the Middle-lower Hanjiang River, China, and investigated the driving factors of diurnal variations. An improved coupled water quantity-quality-ecology model incorporating diurnal cycle was developed by proposing a novel light effect equation and integrating highresolution hourly data, based on previous research and model calibration. This model can simulate river algal blooms and reveal the combined effects of the diurnal cycle on the algal growth and decline process. Model validation at the Zongguan cross-section showed satisfactory performance with the coefficient of determination (R2) greater than 0.70 and root mean square error (RMSE) less than 0.010 during the calibration and validation periods in simulating chlorophyll a (Chla) concentrations. The diurnal fluctuations in Chla concentration increased from a predawn minimum (usually between 4:00 and 8:00) to an afternoon peak (usually between 14:00 and 16:00), followed by a decrease. This pattern was driven by the combined effects of meteorological factors and interactions between algae and nutrients. During the bloom outbreak period, ammonia nitrogen (NH3-N) was identified as the most important nutrient limiting factor. The above results enhance the understanding of mechanisms of algal growth and decline, and provide a scientific tool to support strategies for managing and mitigating algal bloom events in large river systems.

作者关键词: Diurnal fluctuation; Algal blooms; Coupled water quantity-quality-ecology model; Middle-lower Hanjiang river; Combined effects

KeyWords Plus: PHYTOPLANKTON GROWTH; CLIMATE-CHANGE; LIGHT; TEMPERATURE; BASIN; EUTROPHICATION; PRODUCTIVITY; CHLOROPHYLL; SIMULATION; NUTRIENTS

地址: [Liu, Xin; Zhang, Wanshun; Wang, Yue; Jiang, Anna; Li, Ao; Zhang, Xu; Wang, Hao] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

[Zhang, Wanshun] Wuhan Univ, China Inst Dev Strategy & Planning, Wuhan 430079, Peoples R China.

[Zhang, Wanshun] Wuhan Univ, Sch Water Resources & Hydropower Engn, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China.

[Peng, Hong] Wuhan Univ, Sch Water Resources & Hydropower Engn, Wuhan 430072, Peoples R China.

[Wang, Hao] China Inst Water Resources & Hydropower Res, Beijing 100038, Peoples R China.

通讯作者地址: Zhang, WS (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址: wszhang@whu.edu.cn

影响因子：8