The salinity of groundwater in an estuarine delta plain is sometimes related to the presence of an estuarine dam. To understand groundwater processes and salinity variation, time series data on the river water level, groundwater level, and groundwater electrical conductivity were collected for the Nakdong River in southeastern Republic of Korea. Sampling was undertaken upstream of the estuarine barrage system, which is opened and closed depending on upstream flow and seawater level. Comprehensive correlation analysis was performed between the groundwater and river water levels using bubble plots between groundwater electrical conductivity and the hydrological variables. Comparative analysis between the correlations and the field measurements of the hydrological variables indicated a negligible flux connection between the river and groundwater. Oscillatory pressure wave propagation from the river boundary explains the response patterns of the groundwater level. There were different response times for the rising and falling of the river water. Electrical conductivity in groundwater is not directly associated with that of the river except in one well close to the river boundary. The response patterns of groundwater electrical conductivity were explained by potential anthropogenic activity. Further transfer modeling results also indicate a spatial explanatory response pattern for the groundwater level. No spatial patterns in the models of electrical conductivity indicate that the hydrological processes are different with respect to the groundwater level and electrical conductivity.

河口三角洲平原地下水的盐度有时与河口大坝的存在有关。为了了解地下水过程和盐度变化，收集了韩国东南部洛东河的河流水位、地下水位和地下水电导率的时间序列数据。采样在河口拦河坝系统上游进行，根据上游流量和海水水位开启和关闭。利用地下水电导率与水文变量之间的气泡图，对地下水和河流水位进行了综合相关性分析。相关性和水文变量的现场测量之间的比较分析表明，河流和地下水之间的通量连接可以忽略不计。来自河流边界的振荡压力波传播解释了地下水位的响应模式。河水涨落有不同的反应时间。除了靠近河流边界的一口井外，地下水的电导率与河流的电导率没有直接关系。地下水电导率的响应模式可以通过潜在的人为活动来解释。进一步的转移建模结果也表明了地下水位的空间解释响应模式。电导率模型中没有空间模式表明水文过程在地下水位和电导率方面是不同的。