Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Variation of Oxygen and Hydrogen Isotopic Composition in Precipitation and Geothermal Waters from the Yuseong Catchment

유성 소유역의 강수 및 지열수의 산소.수소 안정동위원소 조성 변화

  • Moon, Sang-Ho (Groundwater and Geothermal Resources Division, Korea Intitute of Geoscience and Mineral Resources (KIGAM)) ;
  • Cho, Sung-Hyeon (Groundwater and Geothermal Resources Division, Korea Intitute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Kwang-Sik (Korea Basic Science Institute(KBSI)) ;
  • Yun, Uk (Groundwater and Geothermal Resources Division, Korea Intitute of Geoscience and Mineral Resources (KIGAM))
  • 문상호 (한국지질자원연구원 지하수지열연구부) ;
  • 조성현 (한국지질자원연구원 지하수지열연구부) ;
  • 이광식 (한국기초과학지원연구원) ;
  • 윤욱 (한국지질자원연구원 지하수지열연구부)
  • Published : 2007.08.28
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Abstract

The oxygen and hydrogen isotopic composition in precipitation, groundwater and geothermal water were monitored over four-year period from 2001 to 2004 at the Yuseong catchment, Daejeon. By analyzing the long term rainfall pattern, we found out the drought cycle of 6 or 7 year. We fortunately revealed that the oxygen and hydrogen isotopic composition of rain has progressively changed to heavier isotopic ratios from 2001 to 2004. The weighted mean values of ${\delta}^{18}O\;and\;{\delta}D$ of rain are calculated to be $-7.7%o\;and\;-51%o$, respectively. These isotopic values are much heavier than those of groundwater and geothermal water collected at the same period, which indicates that the rain or snow of the study area would not immediately affect the isotopic composition of groundwater or geothermal water. Comparing with the previous data, the groundwater and geothermal water collected at 1990 and 1992 year has the heaviest isotopic composition and afterwards their isotopic composition has been progressively shifted to the direction of lighter composition field.

2001년부터 2004년까지 유성 소유역내 강수, 지하수, 지열수의 산소 및 수소 동위원소 조성 변화를 검토하였다. 1975년부터 2006년까지의 강수 패턴을 분석한 결과, 연구지역은 $6{\sim}7$년의 가뭄 주기성을 보였다. 2001년도 가뭄 시기부터 2004년까지 4년간 강수의 산소 수소 동위원소 조성은 점차 무거운 성분으로 변화해가는 양상을 보였다. 연구 지역에서 4년간의 강수량을 고려한 동위원소의 가중 평균간을 구해 보면 ${\delta}^{18}O=-7.7%o,\;{\delta}D=-51%o$로서, 동일 기간 내의 지하수와 지열수의 동위원소보다 무거운 조성 범위를 보였다. 이는 연구 지역의 지수 및 지열수가 동위원소적 관점에서 2-3년 이내의 강수에 의해 큰 영향을 받지 않는 것을 의미한다. 기존 자료들을 검토해 볼 때, 연구지역에서의 지하수와 지열수는 1990년과 1992년이 가장 무거운 동위원소 조성을 보였으며 이후로는 산소 및 수소 동위원소 조성이 점차 가벼워지는 쪽으로 변화해가는 양상을 보였다.

Keywords

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