• Determining Characteristics of Groundwater Inflow to the Stream in an Urban Area using Hydrogeochemical Tracers (222Rn and Major Dissolved Ions) and Microbial Community Analysis
  • Yong Hwa Oh1·Dong-Hun Kim1·Soo-Hyoung Lee1·Hee Sun Moon1,2·Soo Young Cho1*

  • 1Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)
    2Department of Mineral and Groundwater Resources, Korea University of Science and Technology (UST)

  • 수리지화학적 추적자(222Rn, 주요용존이온)와 미생물 군집 분석을 통한 도심 지역 하천에서의 지하수 유출 특성 평가
  • 오용화1·김동훈1·이수형1·문희선1,2·조수영1*

  • 1한국지질자원연구원 지질환경연구본부 지하수연구센터
    2과학기술연합대학원대학교 광물·지하수자원학과


In this work, 222Rn activity, major dissolved ions, and microbial community in ground- and surface waters were investigated to characterize groundwater inflow to the stream located in an urban area, Daejeon, Korea. The measured 222Rn activities in groundwater and stream water ranged from 136 to 231 Bq L-1 and 0.3 to 48.8 Bq L-1, respectively. The spatial distributions of 222Rn activity in the stream strongly suggested groundwater inflow to the stream. The change of geochemical composition of the stream water indicated the effect of groundwater discharge became more pronounced as the stream flows downstream. Furthermore, microbial community composition of the stream water had good similarity to that of groundwater, which is another evidence of groundwater discharge. Although groundwater inflow could not be estimated quantitatively in this study, the results can provide useful information to understand interactions between groundwater and surface water, and determine hydrological processes governing groundwater recharge and hydrogeological cycles of dissolved substances such as nutrients and trace metals.

Keywords: Groundwater inflow, 222Rn, Hydrogeochemistry, Microbial community analysis, Stream

This Article

  • 2020; 25(2): 16-23

    Published on Jun 30, 2020

  • 10.7857/JSGE.2020.25.2.016
  • Received on Jun 8, 2020
  • Revised on Jun 10, 2020
  • Accepted on Jun 19, 2020

Correspondence to

  • Soo Young Cho
  • Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)

  • E-mail: sycho@kigam.re.kr