낙동강 수계에서의 하천유량 변동성과 기저유출 기여도의 관계 분석

초록

More severe and frequent flood and drought have increased the attentions on the river management. In particular, baseflow is an important elementamong many streamflow characteristics because streamflow is mainly consisted of direct runoff and baseflow. In this regard, this study attempted toanalyze 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 bythree methods (PART, WHAT and BFLOW), and based on this, Baseflow Index (BFI) was calculated. Also, we used the daily streamflow data retrievedfrom 27 gauge stations in Nakdong river basin for baseflow separation. The results showed that BFI calculated by three models ranges from 0.14 to 0.90for 27 gauge stations. For SVI, BFI has much higher correlation with CV than with CFR. Also, the inversely proportional relationship between BFI andCV showed that higher baseflow contribution, less streamflow variability.

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