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2024 Vol.66, Issue 2 Preview Page
Long-Term Water Quality Trend Analysis of Lake Soyang Using Seasonal Mann-Kendall Test

계절 Mann-Kendall 검정을 이용한 소양호의 장기 수질 경향성 분석

Hojeong Yeoma
,
Yongbin Anb
,
Seyoon Jungc
,
Yoonseok Kimd
,
Bomchul Kime
,
Eunmi Hongf†
염 호정a
,
안 용빈b
,
정 세윤c
,
김 윤석d
,
김 범철e
,
홍 은미f†
aUndergraduate Student, Department of Environmental Science, Kangwon National University
bMS Student, Department of Environmental Management, Kangwon National University
cMS Student, Department of Environmental Management, Kangwon National University
dMS Student, Department of Environmental Management, Kangwon National University
eProfessor Emeritus, Department of Environmental Science, Kangwon National University
fAssociate Professor, Department of environmental Science, Kangwon National University
a강원대학교 환경과학과 학부생
b강원대학교 환경경영학과 MS학생
c강원대학교 환경경영학과 MS학생
d강원대학교 환경경영학과 MS학생
e강원대학교 환경과학부 명예교수
f강원대학교 환경과학부 부교수
† Corresponding author Tel.: +82-33-250-8571 E-mail: eunmi.hong@kangwon.ac.kr
2024. pp. 25-34
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Abstract

The long-term monitoring of the Soyang Lake’s water quality, covering 25% of the North Han River watershed, is crucial for effective management of both lake water quality and pollution sources in the broader region. This study utilized continuous monitoring data from the front of the Soyang Dam spanning 2003 to 2022, aiming to analyze trends and provide foundational insights for water quality management. Results revealed a slightly poor grade (IV) for total nitrogen (T-N) in both surface and mid-depth layers, indicating a need for concentrated T-N management. Trend analyses using the Mann-Kendall test and Sen’s Slope depicted a decreasing trend in total phosphorus (T-P) for both layers, attributed to non-point source pollution reduction projects initiated after the Soyang Lake’s designation as a pollution control area in 2007. The LOWESS analysis showed a T-P increase until 2006, followed by a decrease, influenced by the impact of Typhoon Ewiniar in that year. This 20-year overview establishes a comprehensive understanding of the Soyang Lake’s water quality and trends, allowing for a seasonal and periodical analysis of water quality changes. The findings underscore the importance of continued monitoring and management strategies to address evolving water quality issues in the Soyang Lake over time.

Keywords
Trend analysis
Soyang Lake
long-term monitoring
Mann-Kendall test
LOWESS analysis
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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 : 66
  • No :2
  • Pages :25-34
  • Received Date : 2023-12-13
  • Revised Date : 2024-01-18
  • Accepted Date : 2024-01-19
  • DOI :https://doi.org/10.5389/KSAE.2024.66.2.025
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