Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Watershed Water Quality Management Plan Using SWAT and Load Duration Curve

SWAT와 부하지속곡선을 이용한 유역 수질 관리방안

  • KAL, Byung-Seok (Daonsolution. Co., Ltd.) ;
  • CHO, So-Hyun (Geum River Environmental Research Center, National Institute of Environmental Research) ;
  • PARK, Chun-Dong (Geum River Environmental Research Center, National Institute of Environmental Research) ;
  • MUN, Hyun-Saing (Geum River Environmental Research Center, National Institute of Environmental Research) ;
  • JOO, Yong-Eun (Geum River Environmental Research Center, National Institute of Environmental Research) ;
  • PARK, Jae-Beom (Daonsolution. Co., Ltd.)
  • 갈병석 ((주)다온솔루션) ;
  • 조소현 (국립환경과학원 금강물환경연구소) ;
  • 박천동 (국립환경과학원 금강물환경연구소) ;
  • 문현생 (국립환경과학원 금강물환경연구소) ;
  • 주용은 (국립환경과학원 금강물환경연구소) ;
  • 박재범 ((주)다온솔루션)
  • Received : 2021.09.03
  • Accepted : 2021.09.14
  • Published : 2021.09.30
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Abstract

This study evaluated the application of water quality management measures using the SWAT model and the effectiveness of the measures using the load duration curve targeting the Seohwacheon watershed located upstream of Daecheongho. As water quality management measures, artificial wetlands, reduction of neglected livestock, reduction of runoff from greenhouses, restoration of ecological rivers, application of LID technology, and management of point sources were applied. The applied technology evaluated the efficiency of water quality improvement measures by using the target water quality excess rate and the degree of load reduction for each sulfur through the load duration curve. The load duration curve was created by creating a long-term flow duration curve using SWAT and multiplying it by the target water quality. For the target water quality, the value corresponding to the 60th percentile was set as the target water quality using the 10-year data from the Okcheoncheon water quality observation point located in the downstream of Seohwacheon. Through this study, it was possible to confirm the applicability of various water quality measures through the SWAT model, and to examine the applicability of each period according to the sulfur through the load retention curve.

본 연구는 대청호 상류에 있는 서화천 유역을 대상으로 SWAT(Soil and Watershed Assessment Tool) 모형을 이용한 수질 관리 대책 적용 및 부하지속곡선(LDC, Load Duration Curve)을 이용한 대책의 효율을 평가하였다. 수질 관리 대책으로는 인공습지, 방치 축분 저감, 비닐하우스 유출량 저감, 생태하천 복원, LID(Low Impact Development) 기술 적용, 점오염원 관리를 적용하였다. 적용된 기술은 부하지속곡선을 통해 유황별 목표 수질 초과율 및 부하량 저감 정도를 이용하여 수질 개선대책의 효율을 평가하였다. 부하지속곡선은 SWAT를 이용하여 장기 유량지속곡선(FDC, Flow Duration Curve)을 만들고 목표 수질을 곱하여 작성하였으며 목표 수질은 서화천 하류에 있는 옥천천 수질 관측지점의 10년간 자료를 사용하여 60분위에 해당하는 값을 목표 수질로 설정하였다. 본 연구를 통하여 여러 가지 수질 대책을 SWAT 모형을 통해 적용 가능성을 확인할 수 있으며 부하지속곡선을 통하여 유황에 따른 시기별 적용 가능성을 검토할 수 있었다.

Keywords

Acknowledgement

본 연구는 국립환경과학원 금강물환경연구소의 금강수계 환경기초조사사업의「대청호 상류 비점오염원 모니터링 및 하천모니터링(IV)」에 의해 수행되었습니다.

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