Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Estimating the water supply capacity of Hwacheon reservoir for multi-purpose utilization

다목적 활용을 위한 화천댐 용수공급능력 평가 연구

  • Lee, Eunkyung (Department of Civil System Engineering, Ajou University) ;
  • Lee, Seonmi (Department of Civil System Engineering, Ajou University) ;
  • Ji, Jungwon (Department of Civil System Engineering, Ajou University) ;
  • Yi, Jaeeung (Department of Civil System Engineering, Ajou University) ;
  • Jung, Soonchan (Department of Water Resources, Dongbu Engineering Co.)
  • 이은경 (아주대학교 건설시스템공학과) ;
  • 이선미 (아주대학교 건설시스템공학과) ;
  • 지정원 (아주대학교 건설시스템공학과) ;
  • 이재응 (아주대학교 건설시스템공학과) ;
  • 정순찬 (동부엔지니어링 수자원환경부)
  • Received : 2022.04.28
  • Accepted : 2022.05.14
  • Published : 2022.06.30
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Abstract

In April 2020, the Korean government decided to operate the Hwacheon reservoir, a hydropower reservoir to supply water, and it is currently under pilot operation. Through the pilot operation, the Hwacheon reservoir is the first among the hydropower reservoirs in Korea to make a constant release for downstream water supply. In this study, the water supply capacity of the Hwacheon reservoir was estimated using the inflow data of the Hwacheon reservoir. A simulation model was developed to calculate the water supply that satisfies both the monthly water supply reliability of 95% and the annual water supply reliability of 95%. An optimization model was also developed to evaluate the water supply capacity of the Hwacheon reservoir. The inflow data used as input data for the model was modified in two ways in consideration of the impact of the Imnam reservoir. Calculating the water supply for the Hwacheon reservoir using the two modified inflows is as follows. The water supply that satisfies 95% of the monthly water supply reliability is 26.9 m3/sec and 24.1 m3/sec. And the water supply that satisfies 95% of the annual water supply reliability is 23.9 m3/sec and 22.2 m3/sec. Hwacheon reservoir has a maximum annual water supply of 777 MCM (Million Cubic Meter) without failure in the water supply. The Hwacheon reservoir can supply 704 MCM of water per year, considering the past monthly power generation and discharge patterns. If the Hwacheon reservoir performs a routine operation utilizing its water supply capacity, it can contribute to stabilizing the water supply during dry seasons in the Han River Basin.

2020년 4월, 한강수계의 유효저수용량이 비교적 큰 발전용댐인 화천댐을 용수공급에 활용하기 위한 협약이 체결되었고 현재는 시범운영 중이다. 화천댐은 시범운영을 통해 우리나라 발전용댐 중 최초로 하류부 용수공급을 위해 지속적으로 일정한 유량을 공급하고 있다. 본 연구에서는 화천댐의 규모와 유입량 실적자료를 활용하여 화천댐의 용수공급량을 산정하고 용수공급능력을 평가하였다. 월단위 95% 이수안전도와 연단위 95% 이수안전도를 충족하는 용수공급량을 산정하기 위한 모의 모형과 화천댐 용수공급능력을 산정하기 위한 최적화 모형을 개발하였다. 또한, 모형의 입력자료로 사용되는 유입량 자료는 임남댐의 영향을 고려하여 두 가지 방법으로 보정하였다. 두 가지 보정 유입량을 활용하여 화천댐 용수공급량을 산정한 결과는 다음과 같다. 월단위 95% 이수안전도를 만족하는 용수공급량은 26.86 m3/sec, 24.12 m3/sec, 연단위 95% 이수안전도를 만족하는 용수공급량은 23.88 m3/sec, 22.22 m3/sec이다. 용수공급 실패 없이 화천댐에서 연간 최대 공급할 수 있는 용수공급량은 776.8 MCM이며 과거 월별 발전방류패턴을 고려하여 방류하는 경우에는 연간 704.3 MCM을 공급할 수 있다. 화천댐의 용수공급능력을 활용한 체계적인 운영이 수행된다면 한강수계 갈수기 용수공급 안정화에 기여할 것으로 기대된다.

Keywords

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