Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Water Level and Quality Variations of CO2-rich Groundwater and Its Surrounding Geology in the Chungju Angseong Spa Area, South Korea: Considerations on Its Sustainability

충주 앙성지역 탄산천의 수위/수질 변동과 주변 지질 특성: 탄산천의 지속가능성에 대한 고찰

  • Moon, Sang-Ho (Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kee, Weon-Seo (Geological Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Ko, Kyung-Seok (Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Cholwoo (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Choi, Hanna (Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Koh, Dong-Chan (Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • 문상호 (한국지질자원연구원 기후변화대응연구본부 지하수환경연구센터) ;
  • 기원서 (한국지질자원연구원 국토지질연구본부 지질연구센터) ;
  • 고경석 (한국지질자원연구원 기후변화대응연구본부 지하수환경연구센터) ;
  • 이철우 (한국지질자원연구원 국토지질연구본부 심층처분환경연구센터) ;
  • 최한나 (한국지질자원연구원 기후변화대응연구본부 지하수환경연구센터) ;
  • 고동찬 (한국지질자원연구원 기후변화대응연구본부 지하수환경연구센터)
  • Received : 2022.08.26
  • Accepted : 2022.10.16
  • Published : 2022.10.28
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Abstract

This study examined the sustainability of CO2-rich water by analyzing the water level and water quality change pattern with the amount of its use in Angseong area, Chungju. The origin and supply of CO2 component were discussed in consideration of 87Sr/86Sr ratio, occurrence of CO2-rich fluid inclusions in nearby W-Mo deposits and other surrounding geological characteristics. According to the data from 1986 to 2017, the depth of the water level of CO2-rich water was significantly lowered in the late period (2009-2015) than in the early period (1986-1992) of the development of hot spa wells, and the optimal yields for pumping tests also showed a tendency to gradual decrease. Concentrations of CO2 component also decreased continuously in the later stages compared to the early stages of development, but it has been stable since 2012. It is inferred that the geological environment related to forming W-Mo quartz vein deposits (0.5×1.5×several km) around the study area are largely involved in the origin and supply of CO2 component, and the supply of CO2 component is not infinitely supplied from deep current magma activity. Rather, since it is finitely supplied from a restricted subsurface region formed in the past geological period, it is necessary to efficiently control its use in order to maintain the sustainability of CO2-rich water in the study area.

본 연구는 충주 앙성지역 탄산천의 이용량에 따른 수위 및 수질 변화 패턴을 분석하여 탄산천의 지 속가능성을 검토하였으며, 암석/물의 87Sr/86Sr 값과 주변 W-Mo 광상에서의 함-CO2 유체포유물의 산출, 주변의 지질학적 특성 등을 고려하여 탄산 성분의 기원과 공급에 대하여 고찰하였다. 1986년부터 2017년까지의 자료에 의하면, 탄산천의 수위 심도는 탄산 온천공 개발 초기(1986~1992년)에 비해 후기(2009~2015년)에 매우 하강되어 있으며, 적정양수량도 점차 감소되는 경향을 보였다. 탄산 성분 역시 개발 초기에 비해 후기로 가면서 지속적으로 저감되었으나, 2012년 이후로는 안정된 양상을 보였다. CO2 성분의 기원과 공급은 연구지역 주변에 발달된 W-Mo 석영맥 광상(0.5×1.5×수 km 규모)의 지질학적 생성 환경과 크게 관계된 것으로 추정되며, CO2 성분의 공급이 지하 심부의 마그마 활동으로부터 무한히 공급되는 것이 아니라 과거 지질시대에 형성된 부존지역에서 공급되기 때문에 탄산천의 지속가능성 유지를 위해서는 연구지역 내 탄산수의 이용량을 효율적으로 조정할 필요가 있다.

Keywords

Acknowledgement

이 연구는 국가과학기술연구회의 창의형 융합연구사업 "한국의 자연기원 좋은물 발굴·확보 및 가치고도화 기술개발 (CAP-17-05-KIGAM)"과 한국지질자원연구원의 기본사업 "기후변화대응 대용량지하수 확보 및 최적활용기술 개발 (GP2020-012)"의 지원을 받아 수행되었습니다. 이 논문을 심사하여 주신 심사위원들께 감사의 말씀을 드립니다.

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