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Research Article

Evaluation of stream flow and water quality changes of Yeongsan river basin by inter-basin water transfer using SWAT

SWAT을 이용한 유역간 물이동량에 따른 영산강유역의 하천 유량 및 수질 변동 분석

Yong Won Kima
,
Ji Wan Leeb
,
So Young Wooc†
,
Seong Joon Kimd
김 용원a
,
이 지완b
,
우 소영c†
,
김 성준d
aIntegrated Ph.D. Student, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University
bPost-Doctorate Researcher, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University
cPh.D. Candidate, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University
dProfessor, Division of Civil and Environmental Engineering, College of Engineering, Konkuk University
a건국대학교 일반대학원 사회환경플랜트공학과 석박사통합과정
b건국대학교 일반대학원 사회환경플랜트공학과 박사후 연구원
c건국대학교 일반대학원 사회환경플랜트공학과 박사수료
d건국대학교 공과대학 사회환경공학부 교수
*wsy0209@konkuk.ac.kr
31 December 2020. pp. 1081-1095
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Abstract

This study is to evaluate stream flow and water quality changes of Yeongsan river basin (3,371.4 km2) by inter-basin water transfer (IBWT) from Juam dam of Seomjin river basin using SWAT (Soil and Water Assessment Tool). The SWAT was established using inlet function for IBWT between donor and receiving basins. The SWAT was calibrated and validated with 14 years (2005 ~ 2018) data of 1 stream (MR) and 2 multi-functional weir (SCW, JSW) water level gauging stations, and 3 water quality stations (GJ2, NJ, and HP) including data of IBWT and effluent from wastewater treatment plants of Yeongsan river basin. For streamflow and weir inflows (MR, SCW, and JSW), the coefficient of determination (R2), Nash-Sutcliffe efficiency (NSE), root mean square error (RMSE), and percent bias (PBIAS) were 0.69 ~ 0.81, 0.61 ~ 0.70, 1.34 ~ 2.60 mm/day, and ‒8.3% ~ +7.6% respectively. In case of water quality, the R2 of SS, T-N, and T-P were 0.69 ~ 0.81, 0.61 ~ 0.70, and 0.54 ~ 0.63 respectively. The Yeongsan river basin average streamflow was 12.0 m3/sec and the average SS, T-N, and T-P were 110.5 mg/L, 4.4 mg/L, 0.18 mg/L respectively. Under the 130% scenario of IBWT amount, the streamflow, SS increased to 12.94 m3/sec (+7.8%), 111.26 mg/L (+0.7%) and the T-N, T-P decreased to 4.17 mg/L (‒5.2%), 0.165 mg/L (‒8.3%) respectively. Under the 70% scenario of IBWT amount, the streamflow, SS decreased to 11.07 m3/sec (‒7.8%), 109.74 mg/L (‒0.7%) and the T-N, T-P increased to 4.68 mg/L (+6.4%), 0.199 mg/L (+10.6%) respectively.

Keywords
Yeongsan river
Inter-basin water transfer (IBWT)
Inlet function
Water transfer scenario
SWAT

본 연구는 SWAT (Soil and Water Assessment Tool)을 이용하여 섬진강유역 주암댐에서 영산강유역(3,371.4 km2)으로의 유역간 물이동량 조절에 따른 영산강의 하천유량 및 수질변동을 분석하였다. 이를 위해, SWAT의 Inlet 기능을 이용한 물이동과 영산강유역 하수처리장들의 방류량 자료를 고려한 SWAT을 구축하여, 마륵(MR) 수위관측소와 다기능보 2개(승촌보;SCW, 죽산보;JSW) 그리고 3개의 수질관측소(광주;GJ2, 나주;NJ, 함평;HP)를 대상으로 총 14년(2005~2018) 동안의 유량과 수질을 검보정하였다. 3개 지점 하천유량의 검보정 결과, R2, NSE, RMSE, PBIAS는 각각 0.69 ~ 0.81, 0.61 ~ 0.70, 1.34 ~ 2.60 mm/day, ‒8.3% ~ +7.6%였으며, 수질은 SS, T-N 및 T-P 각각 R2가 각각 0.69 ~ 0.81, 0.61 ~ 0.70, 0.54 ~ 0.63의 범위를 보였다. 물이동량을 고려한 영산강유역의 하천유량은 평균 12.0 m3/sec로 나타났으며, SS, T-N 및 T-P의 평균 농도는 각각 110.5 mg/L, 4.4 mg/L, 0.18 mg/L 이었다. 물이동량의 변화에 따른 영산강의 유량과 수질의 변화를 보기 위하여, 물이동량의 증가(110%, 130%, 150%)와 감소(90%, 70%, 50%)를 적용하였다. 대표적으로 증가시나리오 130%의 경우, 하천유량과 SS의 농도는 각각 12.94 m3/sec (+7.8%), 111.26 mg/L (+0.7%) 증가, T-N과 T-P 농도는 각각 4.17 mg/L (‒5.2%), 0.165 mg/L (‒8.3%)로 감소하였다. 반면 감소시나리오 70%를 적용하였을 때, 하천유량과 SS의 농도는 각각 11.07 m3/sec (‒7.8%), 109.74 mg/L (‒0.7%)로 감소, T-N과 T-P 농도는 각각 4.68 mg/L (+6.4%), 0.199 mg/L (+10.6%) 증가하였다.

키워드
영산강유역
유역간 물이동
Inlet 기능
물이동 시나리오
SWAT
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 53
  • No :12
  • Pages :1081-1095
  • Received Date : 2020-09-07
  • Revised Date : 2020-10-13
  • Accepted Date : 2020-10-13
  • DOI :https://doi.org/10.3741/JKWRA.2020.53.12.1081
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