Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Quantifying Contribution of Direct Runoff and Baseflow to Rivers in Han River System, South Korea

한강수계의 하천에 대한 직접유출과 기저유출의 기여도 정량화

  • Hong, Jiyeong (Dept. of Regional Infrastructure Engrg., Kangwon National University) ;
  • Lim, Kyoung Jae (Dept. of Regional Infrastructure Engrg., Kangwon National University) ;
  • Shin, Yongchul (Climate change Research Team, APEC Climate Center) ;
  • Jung, Younghun (Institute of Environmental Research, Kangwon National University)
  • 홍지영 (강원대학교 농업생명과학대학 지역건설공학과) ;
  • 임경재 (강원대학교 농업생명과학대학 지역건설공학과) ;
  • 신용철 (APEC 기후센터 기후변화연구팀) ;
  • 정영훈 (강원대학교 환경연구소)
  • Received : 2014.02.05
  • Accepted : 2015.03.13
  • Published : 2015.04.30
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Abstract

River characteristics in South Korea has been affected by seasonal climatic variability due to climate change and by remarkable land cover change due to rapid economic growth. In this regard, the roles of river management is getting more important to eco-system and human community in watersheds of South Korea. Understanding river characteristics including direct runoff and baseflow, the first step of river management, can give a significant contribution to sustainable river environment. Therefore, the objective of this study is to quantify the contributions of the direct runoff and baseflow to river streamflow. For this, we used the BFLOW and WHAT programs to conduct baseflow separation for 71 streamflow gauge stations in Han River system, South Korea. The results showed that baseflow index for 71 stations ranges from 0.42 to 0.78. Also, gauge stations which have baseflow index more than 0.5 occupied 76% of a total stations. However, baseflow index can be overestimated due to human impacts such as discharge from dams, reservoirs, and lakes. This study will be used as fundamental information to understand river characteristics in river management at the national level.

국내 하천특성은 기후변화에 의한 계절별 기후변동성과 급속한 경제성장으로 인한 급격한 토지피복의 변화에 의하여 영향을 받아왔다. 이와 관련하여, 하천관리는 수자원이용 등 인간의 활동 뿐 아니라 생태계측면에서도 그 중요성이 커지고 있다. 하천관리의 첫 번째 단계인 직접유출과 기저유출을 포함한 하천특성을 이해하는 것은 지속적인 하천환경을 조성하기 위하여 지대한 기여를 할 수 있다. 그러므로 본 연구의 목적은 효율적인 하천관리를 위해 직접유출과 기저유출을 정량화하여 하천에 미치는 기여도를 산정하는 것이다. 이를 위하여 한강수계에 위치한 71개의 유량관측소에 대하여 BFLOW와 WHAT 프로그램을 이용하여 기저유출 분리를 수행하였다. 그 결과 한강수계의 기저유출비는 0.42에서 0.78의 범위를 가지며, 기저유출비가 50%를 넘는 관측소는 전체 관측소의 76%를 차지하였다. 그러나 산출된 기저유출비는 댐, 저수지, 호수로부터의 방류량과 같은 인위적 영향 때문에 과다산정 되었을 가능성이 있다. 본 연구는 추후 국가적 차원에서 하천관리의 효율성과 안전성을 개선하기 위하여 전략적으로 하천 기능을 조절하는데 기여를 할 것으로 기대한다.

Keywords

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