Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Analysis of Nonpoint source Reduction at Andong Area Considering Changes in CN

CN의 변화에 따른 안동시 물순환 선도도시 조성계획의 비점오염부하 저감효과 분석

  • Kwon, Heongak (Nakdong River Water Environment Research Center, National Institute of Environmental Research) ;
  • Jung, Kangyoung (Nakdong River Water Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Shin (Nakdong River Water Environment Research Center, National Institute of Environmental Research) ;
  • Shin, Sukho (Nakdong River Water Environment Research Center, National Institute of Environmental Research) ;
  • Ahn, Jungmin (Nakdong River Water Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Gyeonghoon (Nakdong River Water Environment Research Center, National Institute of Environmental Research)
  • 권헌각 (국립환경과학원 낙동강물환경연구소) ;
  • 정강영 (국립환경과학원 낙동강물환경연구소) ;
  • 김신 (국립환경과학원 낙동강물환경연구소) ;
  • 신석호 (국립환경과학원 낙동강물환경연구소) ;
  • 안정민 (국립환경과학원 낙동강물환경연구소) ;
  • 김경훈 (국립환경과학원 낙동강물환경연구소)
  • Received : 2016.08.12
  • Accepted : 2016.09.27
  • Published : 2016.11.30
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Abstract

Andong belongs to the Nakdong River Basin, Nakdong River is flowing through the city, including Andong dam and Imha dam. The runoff due to provincial transfer and impervious area has been increasing by urbanization increases and nonpoint source loads. In this study, we evaluate the runoff and nonpoint pollution loads in accordance with the development targeted at selected urban water cycle leading to Andong city. Andong city leading to the water cycle plan to evaluate the directly runoff and BOD, T-N and T-P nonpoint pollutant loads using the CN into account the temporal and spatial changes. Evaluation, direct runoff per year is 10.41 % if the green roof and a water permeable pavement replacement, water cycle parks and streets compositions, City impermeable layer improvements to be business including four kinds of scenario is applied to both the development and the BOD non-point pollutant loads 20.56%, T-N 9.55% and T-P pollution and nonpoint loads was investigated to be reduced 14.29%. Four kinds of low lapse rate of the development scenario of the highest thing urban impervious surface was investigated by improving business development prior year annual direct runoff is 6.25 %, BOD nonpoint pollution loads are 11.84%, T-N nonpoint pollution loads are 4.46 % and T-P was investigated by reducing pollutant loads to be 10.20%.

낙동강수계에 속하는 안동시는 안동댐, 임하댐을 포함하여 낙동강이 흐르는 도시로 경상북도 신 도청 이전과, 지속적 도시화로 인해 불투수 면적이 증가하고 있어 강우 시 유출량 증가 및 비점오염원 부하가 증가되고 있는 지역이다. 본 연구에서는 물순환 선도도시에 선정된 도시 중 안동시를 대상으로 개발에 따른 유출량과 비점오염부하량을 비교 평가하였다. 안동시 물순환 선도도시 계획(안)에 대해 시 공간적 변화를 고려한 CN값을 이용한 직접 유출량과 BOD, T-N 및 T-P 비점오염부하량을 평가한 결과, 옥상녹화 및 투수포장 교체, 물순환 공원 및 거리 조성, 도심지 불투수층 개선 사업 등 4가지 scenario 모두 적용되어 개발될 경우 연간 직접유출이 10.41%, BOD 비점오염부하량이 20.56%, T-N 9.55% 및 T-P 비점오염부하량이 14.29% 저감되는 것으로 조사되었다. 4가지의 개발 scenario 중 저감률이 가장 높은 것은 도시지역 불투수면 개선 사업으로 조사되었으며 개발 이전 대비 연간 직접유출이 6.25%, BOD 비점오염부하량이 11.84%, T-N 비점오염부하량이 4.46% 및 T-P 비점오염부하량이 10.20% 저감되는 것으로 조사되었다.

Keywords

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