Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Case study on application of graphical method for baseflow separation

도식적 기저유출분리기법의 적용에 관한 사례 연구

  • Kang, Taeuk (Disaster Prevention Research Institute, Pukyong National University) ;
  • Lee, Namjoo (Department of Civil Engineering, Kyungsung University)
  • Received : 2021.02.11
  • Accepted : 2021.02.24
  • Published : 2021.04.30
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Abstract

Baseflow constitutes most of the streamflow during the dry season and it is an important factor for stream management. In this study, four techniques for separating baseflow from the streamflow were applied to two target areas to examine the applicability. The baseflow separation techniques used in the analysis are all graphical methods, which are fixed interval method (FIM), sliding interval method (SIM), local minimum method (LMM), and PART programs based on the N-day method. The target areas are the Daeri and Cheongsong stage stations in the Nakdong River Basin where the streamflow was measured continuously for 5 years. We evaluated the appropriateness of the results for baseflow separation methods by examining the indexes for model assessment (NSE, PBIAS, RSR), baseflow index, and shape of baseflow separated from a flood hydrograph. It was analyzed that the FIM, SIM, and LMM methods included some errors in separating the baseflow from streamflow, whereas the PART program results were found to be the best.

유역의 기저유량은 갈수기 하천유량의 대부분을 차지하므로 하천 관리에 있어 중요한 요소이다. 이 연구에서는 하천유량으로부터 기저유량을 분리하는 4가지의 기저유출분리기법을 2개의 대표 지점에 적용하여 적용성을 검토하였다. 분석에 사용된 기저유출분리기법은 모두 도식적 방법으로서, N-day법에 근거한 FIM, SIM, LMM 기법과 PART 프로그램이다. 적용된 지역은 다년간 연속적으로 유량이 측정된 낙동강 유역의 대리 수위관측소 및 청송 수위관측소이다. 기법별 모형평가지표(NSE, PBIAS, RSR), 기저유출지표, 홍수 수문곡선으로부터 분리된 기저유량의 형상을 검토하여 기저유출 분리 결과의 적절성을 평가하였다. FIM, SIM, LMM 기법은 기저유출 분리 시 오류를 일부 포함하고 있는 것으로 분석되었고, 상대적으로 PART 프로그램에 의한 기저유출 분리 결과가 가장 우수한 것으로 나타났다.

Keywords

Acknowledgement

이 연구는 낙동강수계관리위원회 환경기초조사사업의 지원을 받아 추진되었습니다.

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