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2026 Vol.68, Issue 4 Preview Page
Analysis of Water Quality Changes and Driving Factors Before and After Weir Construction in the Yeongsan River Basin: Focusing on Seungchon and Juksan Weirs

영산강 유역 하천보 건설 전⋅후 수질 변화와 영향 요인 분석: 승촌보⋅죽산보를 중심으로

Yongjin Parka
,
Yonggwan Leeb†
,
Jinuk Kimc
,
Yongwon Kimd
,
Wonjun Jeone
,
Seongjoon Kimf
박 용진a
,
이 용관b†
,
김 진욱c
,
김 용원d
,
전 원준e
,
김 성준f
aMS Student, Division of Civil and Environmental Engineering, Graduate School, Konkuk University, Seoul, Republic of Korea
bAssistant Professor, Asia Infrastructure Research Center, Konkuk University, Seoul, Republic of Korea
cPostdoctoral Researcher, Future and Fusion Lab of Architectural, Civil and Environmental Engineering, Korea University, Seoul, Republic of Korea
dPh.D. Candidate, Department of Civil, Environmental and Engineering, Graduate School, Konkuk University, Seoul, Republic of Korea
eMS Student, Division of Civil and Environmental Engineering, Graduate School, Konkuk University, Seoul, Republic of Korea
fProfessor, Division of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul, Republic of Korea
† Corresponding author Tel.: +82-2-450-0993, Fax: +82-2-444-0186 E-mail: leeyg@konkuk.ac.kr
2026. pp. 109-123
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Abstract

This study analyzed long-term water quality variations before (2000~2008) and after (2016~2024) weir construction using data from monitoring stations representative of the basin. Statistical techniques, including the Mann-Kendall test, Welch’s T-test, and Load Duration Curve (LDC) analysis, were applied to eight water quality parameters: water temperature (WT), dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), total nitrogen (T-N), total phosphorus (T-P), and chlorophyll-a (Chl-a). Following weir construction, significant improvements were observed in nutrient and biodegradable organic concentrations due to enhanced watershed management: BOD, SS, T-N, and T-P decreased by 26.5% (6.6 → 4.8 mg/L), 17.8% (19.1 → 15.6 mg/L), 38.0% (8.2 → 5.2 mg/L), and 74.6% (0.6 → 0.1 mg/L), respectively. Conversely, indicators related to water stagnation and internal production deteriorated: COD and Chl-a increased by 29.0% (7.0 → 9.0 mg/L) and 42.1% (31.2 → 44.2 mg/m³), respectively, accompanied by increases in WT (4.0%) and DO (9.7%). These findings reveal a structural shift in pollution mechanisms where physical factors, such as increased residence time, dominate over chemical nutrient limitations (P-limitation), leading to a paradox of increased algal blooms despite nutrient reduction.

Keywords
Yeongsan River Basin
weir construction impact
water quality change
Mann-Kendall test
load duration curve
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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 68
  • No :4
  • Pages :109-123
  • Received Date : 2026-02-03
  • Revised Date : 2026-05-07
  • Accepted Date : 2026-05-13
  • DOI :https://doi.org/10.5389/KSAE.2026.68.4.109
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