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2025 Vol.30, Issue 3 Preview Page
Hydrological Assessment of Baseflow and Influencing Watershed Characteristics in the Yeongsan and Seomjin Watersheds

영산강ㆍ섬진강 유역 기저유출 평가 및 유역 특성과 기저유출의 상관성 검토

Jin Chul Joo1
,
Dong Hwi Lee2
,
Kyung In Chae1
,
Su Ryeon Kim3
,
Kangwei Shi3
,
Kwang Wook Jung2
,
In Kyun Jung2*
주 진철1
,
이 동휘2
,
채 경인1
,
김 수련3
,
Shi Kangwei3
,
정 광욱2
,
정 인균2*
1Department of Civil and Environmental Engineering, Hanbat National University
2Water & Environment Co., Ltd.
3Department of Environmental Engineering, Hanbat National University
1국립한밭대학교 건설환경공학과
2(주)물과환경
3국립한밭대학교 환경공학과
*Corresponding Author
30 June 2025. pp. 29-53
PDF XML Citation
Abstract

This study evaluated the applicability and reliability of various baseflow separation methods in the Yeongsan and Seomjin watersheds, and investigated the relationship between watershed characteristics and the baseflow index (BFI). Both graphical approaches (HYSEP-FIM, SIM, LMM, UKIH-Min, PART) and digital filter methods (Lyne-Hollick 1·2-Pass, Chapman, CM, Eckhardt, EWMA) were applied to estimate BFI, and their performance was assessed using statistical indicators including NSE, KGE, PBIAS, and RSR. Sensitivity analysis revealed that BFI results were highly dependent on parameter settings, particularly for digital filters, with the Eckhardt method demonstrating the most stable and reliable performance, thus identified as the optimal method. Correlation analyses between watershed characteristics (e.g., area, elevation, slope, land use) and BFI showed statistically significant relationships in some main river reaches, while tributary basins exhibited complex interactions requiring multivariate analysis. These findings provide a methodological foundation for future baseflow estimation, and serve as essential baseline data for watershed-scale hydrologic modeling, ecological flow assessment, and integrated water resources planning.

Keywords
Baseflow
Baseflow index (BFI)
Digital filter
Graphical method
Parameter sensitivity
Watershed characteristics
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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 30
  • No :3
  • Pages :29-53
  • Received Date : 2025-05-26
  • Revised Date : 2025-05-29
  • Accepted Date : 2025-06-15
  • DOI :https://doi.org/10.7857/JSGE.2025.30.3.029
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