A Study on Relationship between Streamflow Variability and Baseflow Contribution in Nakdong River Basin

낙동강 수계에서의 하천유량 변동성과 기저유출 기여도의 관계 분석

  • Han, Jeong Ho (Department of Regional Infrastructures Engineering, Kangwon National University) ;
  • Lim, Kyoung Jae (Department of Regional Infrastructures Engineering, Kangwon National University) ;
  • Jung, Younghun (Water Resources Research Center, K-water Institute)
  • Received : 2016.01.12
  • Accepted : 2016.01.18
  • Published : 2016.01.30


More severe and frequent flood and drought have increased the attentions on the river management. In particular, baseflow is an important element among many streamflow characteristics because streamflow is mainly consisted of direct runoff and baseflow. In this regard, this study attempted to analyze the relationship between streamflow variability and baseflow contributions on Nakdong river basin. For this, two Streamflow Variability Indices (SVI) were used: Coefficient of Variation (CV) and Coefficient of Flow Regime (CFR). Furthermore, baselow separation was individually conducted by three methods (PART, WHAT and BFLOW), and based on this, Baseflow Index (BFI) was calculated. Also, we used the daily streamflow data retrieved from 27 gauge stations in Nakdong river basin for baseflow separation. The results showed that BFI calculated by three models ranges from 0.14 to 0.90 for 27 gauge stations. For SVI, BFI has much higher correlation with CV than with CFR. Also, the inversely proportional relationship between BFI and CV showed that higher baseflow contribution, less streamflow variability.



Grant : 한국형 표토 침식 조사 평가 기술개발

Supported by : 국토교통부, 한국환경산업기술원


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