Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Analysis of Factors Affecting Retention Time in Grassed Swale

식생수로에서 유하시간에 영향을 주는 인자 분석

  • Paek, Seoungbong (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Gil, Kyungik (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 백승봉 (서울과학기술대학교 건설시스템공학과) ;
  • 길경익 (서울과학기술대학교 건설시스템공학과)
  • Received : 2014.09.17
  • Accepted : 2015.08.13
  • Published : 2015.08.31
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Abstract

Recently the water quality management policy gives priority to management the point source. Point pollution sources have definite emission points and are discharged to one point through a pipe. But Nonpoint pollution source (NPS) has uncertain pathway, pollutant load and runoff characteristics unlike point pollution sources, making them difficult to manage. Thus, the Korea government plans to develop and equip facilities that help reduce NPS so as to manage them more easily. But removal efficiency of Best Management Practice (BMPs) is in influenced by rainfall, hydrologic condition like natural phenomenon, so factors of removal efficiency are difficult. Thus there is a need for multilateral research about many factors that affect removal efficiency for removal facility design of proper non-point pollution. In this research, mapping, vegetation coverage and retention time were investigated in the case of factors that affect removal efficiency in grassed swale, a nature-type non-point removal facility. Grassed swale obtained changed of coverage using Braun-Blanquet within swale and retention time was obtained from point that rainfall effluent enters into swale to the time that first outflow starts. Besides, correlation analysis was obtained using pearson correlation analysis method. As a result, it was shown that removal efficiency increases as retention time is longer in grassed swale and that retention time increases as vegetation coverage is higher.

현재까지 국내에서의 수질관리 정책은 점오염원 관리를 우선시 하고 있다. 점오염원은 관거를 통해 배출지점이 명확한 지점으로 집중적인 유출특성을 보인다. 하지만 비점오염원은 점오염원과 달리 유출경로, 유출량 및 유출특성이 명확하지 않아 관리에 여러 어려움이 있다. 이에 우리나라는 비점오염원을 관리하기 위해서 비점오염저감시설을 개발 및 설치하여 관리해오고 있다. 그러나 비점오염저감시설은 강우에 대한 영향을 받기 때문에 적절한 설계 및 유지관리에 어려운 실정이다. 따라서 적절한 비점오염 저감시설 설계를 위한 저감효율에 영향을 주는 여러 인자에 대한 다각적 연구가 필요하다. 본 연구에서는 자연형 비점오염저감시설인 식생수로에서 저감효율에 영향을 미치는 인자인 강우사상, 식생피도 및 유하시간을 조사하고 상관성 분석을 수행하였다. 식생피도는 수로 내에 Braun-Blanquet(목측법)을 이용하여 피도의 변화를 구하였으며, 유하시간의 경우 강우유출수가 수로로 유입되는 시점부터 첫 유출이 시작되는 시간까지로 구하였다. 또한 상관성 분석은 pearson 상관성 분석법을 이용하여 구하였다. 그 결과 식생수로에서 유하시간이 길수록 저감효율이 증가하고, 식생피도가 높을수록 유하시간이 증가하는 것으로 나타났다.

Keywords

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