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2023 Vol.33, Issue 4 Preview Page

Research Article

Effect of Dam Operation on the Spatial Variability of Downstream Flow

댐운영에 따른 하류하천 유량의 공간적 변동성 평가

Jeong Eun Lee1*
,
Jeongwoo Lee2
,
Chul-gyum Kim2
,
Il-moon Chung3
이 정은1*
,
이 정우2
,
김 철겸2
,
정 일문3
1Senior Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
2Research Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
3Senior Research Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
1한국건설기술연구원 수자원하천연구본부 수석연구원
2한국건설기술연구원 수자원하천연구본부 연구위원
3한국건설기술연구원 수자원하천연구본부 선임연구위원
*Corresponding Author
31 December 2023. pp. 627-638
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Abstract

This study aimed to evaluate the spatial variability of downstream river flow resulting from the operation of the Gimcheon Buhang Dam in the Gamcheon watershed. The dam’s effects on flood reduction during the flood season and on increasing streamflow during the dry season—two main functions of multipurpose dams—were quantitatively analyzed. Streamflow data from 2013 to 2021 for the study waterhsed were simulated on a daily basis using SWAT-K (Soil and Water Assessment Tool - Korea) model. Comparison of the simulated and observed values found goodness of fit values of 0.75 or higher for both the coefficient of determination and the Nash-Sutcliffe model efficiency coefficient. The spatial analysis of the dam’s effect on flood reduction focused on the annual maximum flood: rates of flood reduction at the four stations ranged from 8.5% to 25.0%. The evaluation of streamflow increase during times of low flow focused on flow duration curves: in particular, compared to the case without an upstream dam, the average low flow at the four sites increased from 33% to 198%.

Keywords
SWAT-K
flood reduction rate
flow duration curve
average low flow

본 연구에서는 김천부항댐이 위치한 감천유역을 대상으로 댐운영에 따른 하류하천 유량의 공간적인 변동성을 평가하고자 하였다. 특히, 다목적댐의 주요기능인 치수적인 측면에서의 홍수저감과 이수적인 측면에서의 갈수기 유량확보 효과를 정량적으로 분석하였다. 대상유역에 대하여 SWAT-K 모델링을 수행하여, 댐 하류하천의 4개 수위관측지점 관측유량과 모의유량을 비교한 결과, R2와 NSE 모두 0.75 이상의 적합도를 확보하였다. 댐의 홍수저감효과의 공간적 분석을 위해 연최대 홍수량을 중심으로 분석한 결과, 4개 지점에서의 홍수저감율은 8.5~25.0%로 나타났다. 갈수기 유량확보 효과에 대해서는 유황곡선을 중심으로 평가하였으며, 특히 평균갈수량의 경우에는 33~198%의 유량증가가 이루어짐을 알 수 있었다.

키워드
SWAT-K
홍수저감율
유황곡선
평균갈수량
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 33
  • No :4
  • Pages :627-638
  • Received Date : 2023-11-30
  • Revised Date : 2023-12-19
  • Accepted Date : 2023-12-19
  • DOI :https://doi.org/10.9720/kseg.2023.4.627
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