作者：Chen, Y., Hu, S., Yang, Y., Cui, K., Zhu, C., Zhang, M., Zhang, Y., Li, C., Mohapatra, S., Jiang, P. & Tong, X.

Water diversion projects are widely implemented to address water scarcity, improve water quality, and restore ecological conditions in degraded aquatic systems. This study applies a process-based hydrodynamic-environmental model to investigate the dynamics of eutrophication and the representative antibiotic tetracycline in Chaohu Lake under the influence of the Yangtze-Chaohu Water Diversion Project. To explore the influence of different diversion pathways, two numerical scenarios were developed representing two alternative water diversion options: western and eastern routes. The model was validated against field data, achieving Nash-Sutcliffe efficiency values ranging from 0.34 to 0.80 and absolute relative differences between 9.31% and 18.64%, indicating satisfactory performance. Assessment results revealed that tetracycline posed high ecological risks during summer, while nutrient concentrations and eutrophication levels remained within mild to moderate ranges throughout the study period. Comparison of the two scenarios indicated that the western route more effectively reduced ecological risks, yielding annual reductions of 9.12% in total phosphorus, 13.68% in chlorophyll-a, and 11.5% in tetracycline concentrations. This study provides critical insights for optimizing the operation of water diversion projects and supports the sustainable management of aquatic ecosystems, particularly in mitigating the combined threats of eutrophication and antibiotic pollution.

调水工程被广泛实施以应对水资源短缺、改善水质和恢复退化水生系统的生态状况。本研究应用基于过程的水动力—环境模型，探讨了长江—巢湖调水工程影响下巢湖富营养化及代表性抗生素四环素的动态变化。为探究不同调水路径的影响，构建了两种数值情景，分别代表西线和东线两种调水方案。模型经实测数据验证，纳什效率系数介于0.34至0.80之间，绝对相对差异介于9.31%至18.64%之间，表明模型性能令人满意。评估结果显示，四环素在夏季呈现较高的生态风险，而营养盐浓度和富营养化水平在整个研究期间均处于轻度至中度范围。两种情景的对比表明，西线方案能更有效地降低生态风险，总磷、叶绿素a和四环素浓度的年削减率分别达到9.12%、13.68%和11.5%。本研究为优化调水工程调度提供了关键见解，并有助于支撑水生生态系统的可持续管理，特别是在缓解富营养化与抗生素污染的双重威胁方面。

（来源：Journal of Hydrology 2026  DOI: 10.1016/j.jhydrol.2026.135255）