한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제55권10호
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  • Pages.785-799
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  • 2022
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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대청댐 저수지의 온실가스 발자국 및 배출 경로 평가

Assessing greenhouse gas footprint and emission pathways in Daecheong Reservoir

  • 민경서 (충북대학교 환경공학과) ;
  • 정세웅 (충북대학교 환경공학과) ;
  • 김성진 (충북대학교 환경공학과) ;
  • 김동균 (한국수자원공사 K-water연구원)
  • Min, Kyeong Seo (Department of Environment Engineering, Chungbuk National University) ;
  • Chung, Se Woong (Department of Environment Engineering, Chungbuk National University) ;
  • Kim, Sung Jin (Department of Environment Engineering, Chungbuk National University) ;
  • Kim, Dong Kyun (K-water Research Institute)
  • 투고 : 2022.08.29
  • 심사 : 2022.09.28
  • 발행 : 2022.10.31
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초록

본 연구의 목적은 대청댐 저수지(금강수계)를 대상으로 G-res Tool을 적용하여 배출 경로별 온실가스(Greenhouse Gas, GHG)의 배출 특성과 댐 건설에 따른 담수 전과 후의 GHG 순 배출량(온실가스 발자국)을 산정하는데 있다. 아울러, 단위전력 생산당 탄소배출량(GHG 배출강도)을 평가하고 저수지 부영양화 상태(총인 농도)에 따른 GHG 배출량 변화의 민감도를 분석하여 수질과 배출량의 관계를 해석하였다. 대청댐 건설 후 연간 GHG 배출 플럭스는 262 gCO2eq/m2/yr이었으며, CO2와 CH4의 비율은 각각 45.7%와 54.2%이었다. 배출 경로별로는 CO2 확산이 가장 많았으며 다음으로 CH4의 확산, 방류 시 탈기, 기포 배출 순으로 산정되었다. 댐 건설 전과 후의 GHG 순 배출량은 담수 전 산림지로 분류된 토지 피복이 담수 후 저수구역으로 변경됨으로써 탄소 흡수효과가 상실되어 510 gCO2eq/m2/yr로 증가하였다. 대청댐의 GHG 배출강도는 전력밀도(저수면적당 발전용량)가 낮아 전세계 수력발전 중앙값보다 약 3.7배 많은 86.8 gCO2eq/kWh로 산정되었다. 그러나 이 값은 화석연료인 석탄의 배출강도보다 9.5배 작은 값에 해당한다는 점은 주목할 만하다. 또한 저수지의 총인 농도가 감소함에 따라 GHG 배출량도 감소하는 것을 확인하였다. 연구 결과는 댐 저수지의 온실가스 배출 특성에 대한 이해를 높이고, 국가 온실가스 인벤토리의 불확실성을 개선하는데 활용될 수 있다.

The aim of this study was to characterize the emission pathways and the footprint of greenhouse gases (GHG) in Daecheong Reservoir using the G-res Tool, and to evaluate the GHG emission intensity (EI) compared to other energy sources. In addition, the change in GHG emissions was assessed in response to the total phosphorus (TP) concentration. The GHG flux in post-impoundment was found to be 262 gCO2eq/m2/yr, of which CO2 and CH4 were 45.7% and 54.2%, respectively. Diffusion of CO2 contributed the most, followed by diffusion, degassing, and bubbling of CH4. The net GHG flux increased to 510 gCO2eq/m2/yr because the forest (as CO2 sink) was lost after dam construction. The EI of Daecheong Reservoir was 86.8 gCO2eq/kWh, which is 3.7 times higher than the global EI of hydroelectric power, due to its low power density. However, it was remarkable to highlight the value to be 9.5 times less than that of coal, a fossil fuel. We also found that a decrease in TP concentration in the reservoir leads to a decrease in GHG emissions. The results can be used to improve understanding of the GHG emission characteristics and to reduce uncertainty of the national GHG inventory of dam reservoirs.

키워드

과제정보

본 연구는 한국수자원공사(K-water)의 개방형 혁신 R&D (21-CP-001) 사업의 일환으로 수행되었습니다.

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