계절 Mann-Kendall 검정을 이용한 소양호의 장기 수질 경향성 분석

초록

The long-term monitoring of the Soyang Lake’s water quality, covering 25% of the North Han River watershed, is crucial for effective managementof both lake water quality and pollution sources in the broader region. This study utilized continuous monitoring data from the front of the SoyangDam spanning 2003 to 2022, aiming to analyze trends and provide foundational insights for water quality management. Results revealed a slightly poorgrade (IV) for total nitrogen (T-N) in both surface and mid-depth layers, indicating a need for concentrated T-N management. Trend analyses usingthe Mann-Kendall test and Sen’s Slope depicted a decreasing trend in total phosphorus (T-P) for both layers, attributed to non-point source pollutionreduction projects initiated after the Soyang Lake’s designation as a pollution control area in 2007. The LOWESS analysis showed a T-P increase until2006, followed by a decrease, influenced by the impact of Typhoon Ewiniar in that year. This 20-year overview establishes a comprehensiveunderstanding of the Soyang Lake’s water quality and trends, allowing for a seasonal and periodical analysis of water quality changes. The findingsunderscore the importance of continued monitoring and management strategies to address evolving water quality issues in the Soyang Lake over time.

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