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http://dx.doi.org/10.4491/KSEE.2014.36.4.258

A Study on Water Quality after Construction of the Weirs in the Middle Area in Nakdong River  

Lee, Sun-Hwa (Department of Environmental Engineering, Yeungnam University)
Kim, Bo-Ram (Department of Environmental Engineering, Yeungnam University)
Lee, Hye-Won (Department of Environmental Engineering, Yeungnam University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.36, no.4, 2014 , pp. 258-264 More about this Journal
Abstract
This study is to investigate water quality changes of nitrogen (N) and phosphorous (P) at Gangjung-Goryeong Weir and Dalseong weir, in 2012-2013. Concentration of COD, TOC, T-N, T-P showed 3.5~6.8 mg/L, 3.4~6.5 mg/L, 1.8~4.0 mg/L, 0.08~0.12 mg/L respectively, in the Nakdong river main stream. Water quality of Dalseong weir showed lower level of contamination than that of Gangjung-Goryeong weir. Because of input loading of nutrients and organic matters from tributaries. At the analysis of sediments at each weirs, sedimentation fluxes of the hypolimnion represented 1.6~2.4 times higher than epilimnion fluxes. Sinking rate (%/d) of SS, N and P of the hypolimion showed in the range of 1.68 %/d~2.42 %/d. It is implied that the suspended matters seem to be floating in the water body. In the result of nutrients release experiment, release flux of nutrients in July showed 3~4 times higher than April. The reason was considered that nutrients is easily released in the anaerobic condition and at high water temperature.
Keywords
Nakdong River; Gangjung-Goryeong Weir; Dalseong Weir; Sediment Flux; Nutrients; Release flux; Do Consumption Rate;
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Times Cited By KSCI : 5  (Citation Analysis)
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