作者：Chen, Y., Hu, S., Yang, Y. et al.

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.

调水工程被广泛用于缓解水资源短缺、改善水质及修复退化水生系统的生态状况。研究应用基于过程的水动力—环境耦合模型，探究了引江济巢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。为考察不同引水路径的影响，研究设置了两个数值情景，分别代表西线与东线两种备选引水方案。模型经实测数据验证，纳什效率系数（NSE）介于0.34-0.80之间，绝对相对偏差介于9.31%-18.64%之间，表明模型性能令人满意。评估结果显示：四环素在夏季构成高生态风险，而营养盐浓度与富营养化水平在整个研究期内维持在轻—中度范围。两情景对比表明，西线方案更有效地降低了生态风险，总磷、叶绿素a与四环素浓度的年削减率分别为9.12%、13.68%与11.5%。本研究为调水工程的优化调度提供了关键参考，支持水生生态系统的可持续管理，尤其有助于应对富营养化与抗生素污染的复合威胁。

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