Karst regions cover approximately 10% of the Korean Peninsula and are highly vulnerable to contamination. In this study, five field surveys were conducted between 2017 and 2019 to examine the monthly and seasonal changes in the hydro-environment of a characteristic karst region in Samchoek, South Korea. During the surveys, a total of 24 surface water samples were collected and analyzed for field water quality parameters, major and minor ions, and stable isotopes. The results indicate that the water quality in the study area is significantly affected by precipitation. Overall, the water was classified as a Ca-Mg-HCO₃ type, and correlation analysis of the major ions detected in the water samples indicates that the inflow of nitrate to the surface water originated from agricultural activities in the region. Furthermore, variations caused by climate were verified using the relationships between the various ions. In addition, high precipitation rates during the rainy season cause the active exchange of surface material, which was verified using stable isotope outliers. The results provide a scientific basis for studying the connectivity of water systems in complex karst hydrogeological regions and can aid future sustainable management of water resources in these regions.

中文翻译：

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韩国三che市喀斯特地区水化学和稳定同位素的特征

喀斯特地区约占朝鲜半岛的10％，极易受到污染。在这项研究中，2017年至2019年进行了五次现场调查，以检查韩国Samchoek特有喀斯特地区水环境的每月和季节性变化。在调查期间，总共收集了24个地表水样品，并分析了田间水质参数，主要和次要离子以及稳定的同位素。结果表明，研究区的水质受到降水的显着影响。总体而言，水被归类为Ca-Mg-HCO ₃样品中主要离子的类型和相关分析表明，硝酸盐向地表水中的流入源于该地区的农业活动。此外，利用各种离子之间的关系验证了气候引起的变化。此外，雨季期间高的降水率导致表层物质的主动交换，这已通过稳定的同位素离群值进行了验证。研究结果为研究复杂岩溶水文地质地区水系统的连通性提供了科学依据，并有助于这些地区未来水资源的可持续管理。