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Potential Impacts of Future Extreme Storm Events on Streamflow and Sediment in Soyang-dam Watershed

기후변화에 따른 미래 극한호우사상이 소양강댐 유역의 유량 및 유사량에 미치는 영향

  • Han, Jeong Ho (Department of Regional Infrastructures Engineering, Kangwon National University) ;
  • Lee, Dong Jun (Department of Regional Infrastructures Engineering, Kangwon National University) ;
  • Kang, Boosik (Department of Civil and Environmental Engineering, Dankook University) ;
  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Jang, Won Seok (University of Colorado Boulder) ;
  • Lim, Kyoung Jae (Department of Regional Infrastructures Engineering, Kangwon National University) ;
  • Kim, Jonggun (Institute of Agriculture and Life Science, Kangwon National University)
  • Received : 2016.12.12
  • Accepted : 2017.03.14
  • Published : 2017.03.30

Abstract

The objective of this study are to analyze changes in future rainfall patterns in the Soyang-dam watershed according to the RCP 4.5 scenario of climate change. Second objective is to project peak flow and hourly sediment simulated for the future extreme rainfall events using the SWAT model. For these, accuracy of SWAT hourly simulation for the large scale watershed was evaluated in advance. The results of model calibration showed that simulated peak flow matched observation well with acceptable average relative error. The results of future rainfall pattern changes analysis indicated that extreme storm events will become more severe and frequent as climate change progresses. Especially, possibility of occurrence of large scale extreme storm events will be greater on the periods of 2030-2040 and 2050-2060. In addition, as shown in the SWAT hourly simulation for the future extreme storm events, more severe flood and turbid water can happen in the future compared with the most devastating storm event which occurred by the typhoon Ewiniar in 2006 year. Thus, countermeasures against future extreme storm event and turbid water are needed to cope with climate change.

Keywords

Acknowledgement

Supported by : 국토교통부

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