Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Effects of Dams and Water Use on Flow Regime Alteration of the Geum River Basin

금강 유역의 댐과 물이용에 의한 유황의 변동특성 분석

  • Kang, Seong-Kyu (Korea Institute of Construction Technology, Water resources research division) ;
  • Lee, Dong-Ryul (Korea Institute of Construction Technology, Water resources research division) ;
  • Moon, Jang-Won (Korea Institute of Construction Technology, Water resources research division) ;
  • Choi, Si-Jung (Korea Institute of Construction Technology, Water resources research division)
  • 강성규 (한국건설기술연구원 수자원연구실) ;
  • 이동률 (한국건설기술연구원 수자원연구실) ;
  • 문장원 (한국건설기술연구원 수자원연구실) ;
  • 최시중 (한국건설기술연구원 수자원연구실)
  • Published : 2010.04.30
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Abstract

This study presents the alteration of flow regime by effects of dams and water use in the Geum River Basin. The surface water use rate and the Impounded Runoff (IR) index were examined to assess the pressure indicators of the flow alteration. We applied the flow duration curve, flow regime coefficient, flood and low-flow frequency analysis as well as Range of Variability Approach (RVA) to investigate the quantitative changes in natural flow regimes. The results indicate that the high flow decreased and low flow increased respectively compared to the natural flow regimes at eight gauging stations. The Geum river is regulated by 139 dams and reservoirs storing 24% of the annual mean discharge and has high surface water use rate of 36%. These indicators are main pressure factors to alter flow regimes.

본 연구에서는 금강유역의 물이용과 댐의 영향에 의한 하천유황의 변화를 평가하였다. 유황변화의 압력지표로서 하천수 이용률과 담수지수를 분석하였다. 유황의 정량적인 변화 분석을 위하여 유황곡선, 유황계수, 홍수 및 갈수 빈도분석과 유량변동분석법을 적용하였다. 8개 분석 대상지점의 결과는 댐 건설전의 유황과 비교할 때 댐과 물이용의 영향으로 고유량 범위에서는 감소하고, 저유량 범위에서는 증가하고 있음을 구체적인 수치로 확인하였다. 금강유역은 연평균유출량의 24%를 저류할 수 있는 139개의 댐과 저수지에 의해 유황이 조절되고 지표수의 이용률이 36%로서 이들의 지표가 유황변화의 압력요인이 되고 있다.

Keywords

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