Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Impact of a Flushing Discharge from an Upstream Dam on the NH3-N Concentrations during Winter Season in Geum River

상류 댐 플러싱 방류가 금강의 겨울철 암모니아성 질소 농도 저감에 미치는 효과분석

  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Yu-kyung (Department of Environmental Engineering, Chungbuk National University)
  • Received : 2005.06.27
  • Accepted : 2005.08.24
  • Published : 2005.11.30
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Abstract

A high ammonia nitrogen ($NH_3-N$) concentration has been recursively observed every winter season in Geum River, which hindered chemical treatment processes at a water treatment plant. A flushing discharge from Daecheong Dam was often considered to dilute $NH_3-N$, but information on the quantitative effect of flushing on the downstream water quality was limited. In this study, the impact of a short-term reservoir flushing on the downstream water quality was investigated through field experiments and unsteady water quality modeling. On November 22, 2003, the reservoir discharge was increased from $30m^3/sec$ to $200m^3/sec$ within 6 hours for the purpose of the experiment. The results showed that flushing flow tends to reduce downstream $NH_3-N$ concentrations considerably, but the effectiveness was limited by flushing amount and time. An unsteady river water quality model was applied to simulate the changes of nitrogen concentrations in response to reservoir flushing. The model showed very good performance in predicting the travel time of flushing flow and the effect of flushing discharge on the reduction of downstream $NH_3-N$ concentrations at Maepo and Geumnam site, but a significant discrepancy was observed at Gongju site.

Keywords

Acknowledgement

Supported by : 충북대학교

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