Hydraulic structures have a significant impact on riverine environment, leading to changes in stream–aquifer interactions. In South Korea, 16 weirs were constructed in four major rivers, in 2012, to secure sufficient water resources, and some weirs operated periodically for natural ecosystem recovery from 2017. The changed groundwater flow system due to weir operation affected the groundwater level and quality, which also affected groundwater use. In this study, we analyzed the changes in the groundwater flow system near the Geum River during the Baekje weir operation using Visual MODFLOW Classic. Groundwater data from 34 observational wells were evaluated to analyze the impact of weir operation on stream–aquifer interactions. Accordingly, the groundwater discharge rates increased from 0.23 to 0.45 cm/day following the decrease in river levels owing to weir opening, while the hydrological condition changed from gaining to losing streams following weir closure. The variation in groundwater flow affected the groundwater quality during weir operation, changing the groundwater temperature and electrical conductivity (EC). Our results suggest that stream–aquifer interactions are significantly affected by weir operation, consequently, these repeated phenomena could influence the groundwater quality and groundwater use.

中文翻译：

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百济堰作业对韩国锦江流域河流-含水层相互作用的影响

水力结构对河流环境有重大影响，导致河流-含水层相互作用发生变化。韩国 2012 年在 4 条主要河流上建造了 16 座堰，以确保充足的水资源，一些堰从 2017 年开始定期运行以恢复自然生态系统。 由于堰运行改变的地下水流系统影响了地下水位和水质，这也影响了地下水的使用。在这项研究中，我们使用 Visual MODFLOW Classic 分析了百济堰作业期间锦江附近地下水流系统的变化。对来自 34 口观测井的地下水数据进行了评估，以分析堰操作对河流-含水层相互作用的影响。因此，地下水排放率从 0.23 增加到 0。开堰导致河水水位下降 45 厘米/天，而水文条件在堰关闭后由增流变为断流。地下水流量的变化影响了堰运行期间的地下水水质，改变了地下水温度和电导率（EC）。我们的研究结果表明，河流-含水层的相互作用受堰的作用显着影响，因此，这些重复现象可能会影响地下水质量和地下水利用。