Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Prospect of future water resources in the basins of Chungju Dam and Soyang-gang Dam using a physics-based distributed hydrological model and a deep-learning-based LSTM model

물리기반 분포형 수문 모형과 딥러닝 기반 LSTM 모형을 활용한 충주댐 및 소양강댐 유역의 미래 수자원 전망

  • Kim, Yongchan (Department of Civil Engineering, Hongik University) ;
  • Kim, Youngran (Technology Development Headquarter, Seoul Institute of Technology) ;
  • Hwang, Seonghwan (Technology Development Headquarter, Seoul Institute of Technology) ;
  • Kim, Dongkyun (Department of Civil Engineering, Hongik University)
  • 김용찬 (홍익대학교 건설환경공학과) ;
  • 김영란 (서울기술연구원 기술개발본부) ;
  • 황성환 (서울기술연구원 기술개발본부) ;
  • 김동균 (홍익대학교 건설환경공학과)
  • Received : 2022.10.28
  • Accepted : 2022.11.25
  • Published : 2022.12.31
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Abstract

The impact of climate change on water resources was evaluated for Chungju Dam and Soyang-gang Dam basins by constructing an integrated modeling framework consisting of a dam inflow prediction model based on the Variable Infiltration Capacity (VIC) model, a distributed hydrologic model, and an LSTM based dam outflow prediction model. Considering the uncertainty of future climate data, four models of CMIP6 GCM were used as input data of VIC model for future period (2021-2100). As a result of applying future climate data, the average inflow for period increased as the future progressed, and the inflow in the far future (2070-2100) increased by up to 22% compared to that of the observation period (1986-2020). The minimum value of dam discharge lasting 4~50 days was significantly lower than the observed value. This indicates that droughts may occur over a longer period than observed in the past, meaning that citizens of Seoul metropolitan areas may experience severe water shortages due to future droughts. In addition, compared to the near and middle futures, the change in water storage has occurred rapidly in the far future, suggesting that the difficulties of water resource management may increase.

본 연구는 충주댐과 소양강댐 유역을 대상으로 분포형 수문모형인 Variable Infiltration Capacity (VIC) 모형 기반의 댐 유입량 예측 모형과 딥러닝 모형의 일종인 LSTM 기반의 댐 방류량 예측 모형으로 구성된 통합 모델링 프레임워크를 구성하여 미래 기후변화가 수자원에 미치는 영향을 평가하였다. 기후모델에 따른 미래 기후자료의 불확실성을 고려하여 4개의 CMIP6 GCM 모델의 기후자료를 미래기간(2021-2100)에 대한 VIC 모형의 기상자료로 입력하였다. 미래기후자료를 적용한 결과, 미래가 진행됨에 따라 기간별 평균 유입량이 증가하였으며, 먼 미래(2070-2100)에는 관측기간(1986-2020)에 비해 유입량이 최대 22% 증가하였다. 갈수량 분석 결과, 임의의 4일~50일에 대한 댐 방류량의 최소값은 관측치에 비해 현저히 낮은 것으로 나타났다. 이는 가뭄이 과거에 관측된 것보다 더 장기간에 걸쳐 발생할 수 있음을 나타내며, 수도권 시민들이 미래의 가뭄으로 인해 심각한 물 부족을 겪을 수 있다는 것을 의미한다. 또한, 단기 및 중기 미래에 비하여 장기미래에 저수량의 변화가 급격하게 이루어졌으며 이는 수자원 관리의 어려움이 증대될 수 있음을 시사한다.

Keywords

Acknowledgement

본 논문은 서울기술연구원(2022-AC-003, 서울특별시 물 재이용 관리계획 수립 용역)의 지원을 받아 수행된 연구입니다.

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