전주시 오송지와 덕진연못의 계절별 수질 및 부영양화 지수 변화 = Seasonal Changes in Water Quality and Eutrophication Indices in Osongji and Deokjin Pond, Jeonju-si, Korea

다국어 초록 (Multilingual Abstract)

This study aimed to investigate seasonal changes in water quality and eutrophication indices in small-scale water bodies,focusing on Osongji and Deokjin Pond, located in Jeonju-si, Korea. Water quality was examined seven times betweenNovember 2022 and September 2023 at both locations. In the field, pH, Eh, electrical conductivity (EC), dissolved oxygen(DO), and water temperature were measured, while alkalinity, chemical oxygen demand (COD), chlorophyll-a, T-P, T-N,and anions (PO43−-P, NO3−-N, and SO42−) were measured in the laboratory. COD and T-N values increased in the summerdue to precipitation, and T-P, a key factor influencing algal growth, showed similar trends to chlorophyll-a. Nutrientscarried by summer precipitation also increased PO43−-P, NO3−-N, and SO42− levels. For eutrophication assessment, the TSIKO, amodified version of Carlson’s Trophic State Index (TSI) adapted for Korea, indicated hypereutrophic conditions in Osongjiduring heavy rainfall in June and July 2023, reflecting typical seasonal variations of algal growth. In contrast, Deokjin Pondshowed no significant changes, attributable to its artificial nature. This suggests that small water bodies in natural settings aremore susceptible to seasonal fluctuations and multiple factors should be considered in water quality management.

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