The Spatiotemporal Eutrophication Status and Trends in the Paldang Reservoir, Republic of Korea

Yong-Chul Cho, Ho-Yeong Kang, Ju-Yeon Son, Taegu Kang and Jong-Kwon Im ()
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Yong-Chul Cho: Han River Environment Research Center, Nation Institute of Environmental Research, 42, Dumulmeori-gil 68beon-gil, Yangseo-myeon, Yangpyeong-gun 12585, Gyeonggi-do, Republic of Korea
Ho-Yeong Kang: Han River Environment Research Center, Nation Institute of Environmental Research, 42, Dumulmeori-gil 68beon-gil, Yangseo-myeon, Yangpyeong-gun 12585, Gyeonggi-do, Republic of Korea
Ju-Yeon Son: Han River Environment Research Center, Nation Institute of Environmental Research, 42, Dumulmeori-gil 68beon-gil, Yangseo-myeon, Yangpyeong-gun 12585, Gyeonggi-do, Republic of Korea
Taegu Kang: Han River Environment Research Center, Nation Institute of Environmental Research, 42, Dumulmeori-gil 68beon-gil, Yangseo-myeon, Yangpyeong-gun 12585, Gyeonggi-do, Republic of Korea
Jong-Kwon Im: Han River Environment Research Center, Nation Institute of Environmental Research, 42, Dumulmeori-gil 68beon-gil, Yangseo-myeon, Yangpyeong-gun 12585, Gyeonggi-do, Republic of Korea

Sustainability, 2023, vol. 16, issue 1, 1-17

Abstract: The Paldang Reservoir (PDR), the largest artificial lake in the Republic of Korea, has recently experienced increased chemical oxygen demand (COD), eutrophication, and algal blooms due to climate change. This study aimed to analyze the hydrological characteristics and water quality of the PDR and assess its spatial and seasonal eutrophication status changes using the Korean-type trophic quality index (TSI KO ) and the seasonal Mann–Kendall Test (SMK). The PDR’s water was graded “good” in terms of biochemical oxygen demand (BOD) and “fair” for COD, total phosphorous (TP), and chlorophyll-a (Chl- a ), according to Korean water quality standards. COD and Chl- a had a significant positive monotonic relationship. According to the TSI KO calculations, the trophic state of the PDR was mesotrophic, but eutrophic during the summer season. TSI KO (Chl- a ) in summer tended to increase with a slope value of 0.22 mg/m 3 /year. The main causes of eutrophication in the PDR were proposed to be TP and phytoplankton overgrowth. Therefore, lake and reservoir functions need to be assessed, and solutions that can effectively protect them from excessive eutrophication to ensure sustainable clean water use and protect freshwater ecosystems need to be found.

Keywords: trophic state index; Korean trophic quality index; seasonal Mann–Kendall test; seasonal variation; correlation analysis; nutrient (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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