Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Application of QUAL2K Model for Daejeon Tandongcheon, A Small Urban Stream and Evaluation of Terrace Land Constructed Wetland

도시 소하천, 대전 탄동천, 수질개선 대안 수립을 위한 QUAL2K 수질모델 구축과 제외지 인공습지공법 적용 효율 평가

  • Yin, Zhenhao (Department of Environmental Engineering, Chungnam National University) ;
  • Seo, Dongil (Department of Environmental Engineering, Chungnam National University)
  • Received : 2013.01.28
  • Accepted : 2013.02.28
  • Published : 2013.03.30
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Abstract

The Tandong-cheon stream is a 7.4 km long small urban stream that passes through Daeduk Science Town in Daejeon Korea. Despite the stream has great potential as an educational and recreational site due to its central location in the science town and science museums nearby, environmental aspect especially for water quality has not been evaluated properly. Through field survey, major pollution sources of the stream were identified and effect of water quality improvement alternatives were evaluated using a QUAL2K water quality model for the stream. The study indicated that controlling major pollution sources of the stream alone may not be sufficient for reaching the water quality target. Therefore, additional pollution control methods are necessary. We applied the developed model to evaluate the effects of a constructed wetland on the terrace land, and analyzed whether the water quality target can be met at the outlet of the stream. It is expected that this study would provide a good reference for environmentally sound management of small urban streams in Korea.

도시의 하천은 주민의 생활공간의 일부로서 환경적인 지속성을 위해 자연 친환경적으로 관리함이 바람직하나 현재 홍수예방, 또는 조경공사에 가까운 하천정비만 되어 왔으며 하천의 수질보전 및 관리를 위한 지속가능한 수질관리 방안의 수립이 필요한 상황이다. 탄동천은 대전시 유성구 추목동을 기점으로 갑천으로 유입되는 지방 2급 하천이다. 상류에는 군부대, 중류는 주거단지, 하류는 국가주요 연구단지, 그리고 국가적인 규모의 문화시설이 공존하는 지역으로 소규모하천의 자연 친화적 관리에 매우 좋은 예가 될 수 있을 것으로 전망된다. 본 연구는 탄동천에 대한 수질조사를 진행하고 전면적인 진단을 해보았다. 그 결과 상류의 하수처리장 방류수와 신성교 부근의 관거유출수가 주오염원으로 발견되었다. 탄동천 수질개선을 위해서는 이러한 오염원들에 대한 관리가 필수이며 그 대책으로 하수처리장 고도처리시설 도입과 하수처리장과 신성교 부근의 하천둔치에 인공습지를 설계하여 수질개선을 제안하였으며 1차원 수질모델인 QUAL2K를 이용하여 상술한 방안에 대한 수질개선 효과를 예측해 보았다. 모의결과 특히 T-P의 경우 0.05 mg/L 이하로 개선되는 것으로 모의되어 하천의 부영양화 방지에도 뚜렷한 효과가 있을 것으로 판단된다. 개선된 탄동천 수변공간은 인근 주민들에게 쾌적한 환경을 제공할 수 있으며 성공적인 수질관리 사례는 여타 하천관리의 설계, 시공에 큰 도움이 될 것이다.

Keywords

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