The interactions between groundwater and surface water under a river island in South Korea were investigated. Sampling was focused on the western part of the island, where a groundwater heat pump system with groundwater monitoring wells has been installed. A riverside area was selected for the system because a high specific capacity was expected. However, surface-water intrusion remains a major concern, as the efficiency of the system can be impaired by groundwater temperature changes following surface-water infiltration. A combination of radon (²²²Rn) concentrations and microbial diversity was analyzed, along with hydraulic data. A process for estimating residence time based on ²²²Rn data and flow direction was developed to identify relationships with microbial diversity. The spatial distribution of ²²²Rn concentration was affected by fluctuations of river water levels caused by surrounding dam discharge and seasonal effects. Groundwater flowmeter data supported observations on these distributions. The estimated residence times indicated that river-water infiltration into the study site affected the groundwater flow direction. The microbial diversity, based on cluster analyses after pyrosequencing, showed significant variation with river flow direction and rainfall events, which was in accordance with the ²²²Rn tracer results. The combination of frequent ²²²Rn concentration measurements with microbial data allows better characterization of the dynamic interactions between groundwater and surface water.

研究了韩国一个河流岛下的地下水与地表水之间的相互作用。采样集中在岛的西部，那里安装了带有地下水监测井的地下水热泵系统。选择该系统的河滨地区是因为预计会有较高的比容。但是，地表水的入侵仍然是一个主要问题，因为系统的效率会因地表水渗透后的地下水温度变化而受到损害。分析了of（²²² Rn）浓度和微生物多样性的组合，以及水力数据。基于^222的停留时间估计过程开发了Rn数据和流向以识别与微生物多样性的关系。²²² Rn浓度的空间分布受周围水坝流量和季节影响引起的河水位波动的影响。地下水流量计数据支持对这些分布的观测。估计的停留时间表明，河水向研究地点的渗透影响了地下水的流动方向。基于焦磷酸测序后的聚类分析，微生物多样性显示出随河流流向和降雨事件的显着变化，这与²²² Rn示踪剂的结果一致。组合频繁²²²利用微生物数据进行的Rn浓度测量可以更好地表征地下水与地表水之间的动态相互作用。