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http://dx.doi.org/10.3741/JKWRA.2022.55.12.1065

Effects of Salix subfragilis communities on water quality in Namgang Dam reservoir  

Kim, Ki Heung (Department of Civil and Infrastructure Engineering, Gyeongsang National University)
Publication Information
Journal of Korea Water Resources Association / v.55, no.12, 2022 , pp. 1065-1076 More about this Journal
Abstract
The purpose of this study was to investigate the effect of the expansion and withering of Salix subfragilis communities on the water quality in Namgang Dam reservoir. The distribution area of the Salix subfragilis communities was 0.12 km2 in 2003 for the first time, but it was 3.58 km2 in 2019, which has increased rapidly by about 30 times in 16 years. However, in 2013, the distribution area has decreased by 0.17 km2 due to long-term immersion in high turbidity, and self-thinning in Salix subfragilis communities. The lake characteristics of reservoir showed a combination of lake type and river type in terms of average water depth, watershed area/lake surface area ratio, water residence time, flushing rate, and stratification. From the result of analyzing long-term changes in lake water quality, COD, TP, and chlorophyll-a in Salix subfragilis communities were significantly larger than those in the three points located in the central part of reservoir. In particular, the fact that the value of chlorophyll-a showed the maximum value in winter rather than summer, unlike the trend of the three points in the Namgang Dam water quality monitoring network, is thought to have occurred internally rather than externally. It can be estimated that one cause of this deterioration of the water quality in Namgang Dam reservoir is the huge amount of nutrients generated in the decomposition process of by-products such as fallen leaves, branches and withered trees in Salix subfragilis communities.
Keywords
Expansion and withering; Self-thinning; High turbidity; Withered tree; Nutrients;
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