Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Impact of Climate Change on Water Cycle and Soil Loss in Daecheong Reservoir Watershed

기후변화에 따른 대청호 유역의 물 순환 및 토양 유실량 영향

  • Ye, Lyeong (Department of Environmental Engineering, Chungbuk National University) ;
  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Oh, Dong Geun (Department of Environmental Engineering, Chungbuk National University) ;
  • Yoon, Sung Wan (Department of Environmental Engineering, Chungbuk National University)
  • 예령 (충북대학교 환경공학과) ;
  • 정세웅 (충북대학교 환경공학과) ;
  • 오동근 (충북대학교 환경공학과) ;
  • 윤성완 (충북대학교 환경공학과)
  • Received : 2009.03.11
  • Accepted : 2009.09.29
  • Published : 2009.11.30
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Abstract

The study was aimed to assess the expected impact of climate change on the water cycle and soil losses in Daecheong Reservoir watershed, Korea using the Soil and Water Assessment Tool (SWAT) that was validated for the watershed in a previous study. Future climate data including precipitation, temperature and humidity generated by introducing a regional climate model (Mesoscale Model Version 5, MM5) to dynamically downscale global circulation model (European Centre Hamburg Model Version 4, ECHAM4) were used to simulate the hydrological responses and soil erosion processes in the future 100 years (2001~2100) under the Special Report on Emissions Scenario (SRES) A1B. The results indicated that the climate change may increase in the amount of surface runoff and thereby sediment load to the reservoir. Spatially, the impact was relatively more significant in the subbasin Bocheongcheon because of its lower occupation rate of forest land compared to other subbasins. Seasonally, the increase of surface runoff and soil losses was more significant during late summer and fall season when both flood control and turbidity flow control are necessary for the reservoir and downstream. The occurrence of extreme turbidity flow events during these period is more vulnerable to reservoir operation because the suspended solids that remained water column can be resuspended by vertical mixing during winter turnover period. The study results provide useful information for the development of adaptive management strategy for the reservoir to cope with the expected impact of future climate change.

Keywords

Acknowledgement

Supported by : 수자원의 지속적 확보기술개발사업단

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