Long-term Simulation and Uncertainty Quantification of Water Temperature in Soyanggang Reservoir due to Climate Change

기후변화에 따른 소양호의 수온 장기 모의 및 불확실성 정량화

  • Yun, Yeojeong (Department of Environmental Engineering, Chungbuk National University) ;
  • Park, Hyungseok (Department of Environmental Engineering, Chungbuk National University) ;
  • Chung, Sewoong (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Yongda (Department of Statistics, Seoul National University) ;
  • Ohn, Ilsang (Department of Statistics, Seoul National University) ;
  • Lee, Seoro (Department of Regional Infrastructure Engineering, Kangwon National University)
  • Received : 2019.09.30
  • Accepted : 2020.01.23
  • Published : 2020.01.30


Future climate change may affect the hydro-thermal and biogeochemical characteristics of dam reservoirs, the most important water resources in Korea. Thus, scientific projection of the impact of climate change on the reservoir environment, factoring uncertainties, is crucial for sustainable water use. The purpose of this study was to predict the future water temperature and stratification structure of the Soyanggang Reservoir in response to a total of 42 scenarios, combining two climate scenarios, seven GCM models, one surface runoff model, and three wind scenarios of hydrodynamic model, and to quantify the uncertainty of each modeling step and scenario. Although there are differences depending on the scenarios, the annual reservoir water temperature tended to rise steadily. In the RCP 4.5 and 8.5 scenarios, the upper water temperature is expected to rise by 0.029 ℃ (±0.012)/year and 0.048 ℃ (±0.014)/year, respectively. These rise rates are correspond to 88.1 % and 85.7 % of the air temperature rise rate. Meanwhile, the lower water temperature is expected to rise by 0.016 ℃ (±0.009)/year and 0.027 ℃ (±0.010)/year, respectively, which is approximately 48.6 % and 46.3 % of the air temperature rise rate. Additionally, as the water temperatures rises, the stratification strength of the reservoir is expected to be stronger, and the number of days when the temperature difference between the upper and lower layers exceeds 5 ℃ increases in the future. As a result of uncertainty quantification, the uncertainty of the GCM models showed the highest contribution with 55.8 %, followed by 30.8 % RCP scenario, and 12.8 % W2 model.



Supported by : 한국환경산업기술원

본 연구는 환경부/한국환경산업기술원의 연구비지원(과제번호 RE201901083)에 의해 수행되었습니다.


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