Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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An Analysis of First Flush Phenomenon of Non-point Source Pollution during Rainfall-Runoff Events from Impervious Area

불투수성 지역의 강우유출수에 대한 비점오염물질의 초기유출현상 분석

  • Ahn, Tae-Ung (Zero Emission Center (ZEC), Sungkyunkwan University) ;
  • Bum, Bong-Su (Department of Food Nutrition, Kyung-In Women's University) ;
  • Kim, Tae-Hoon (Department of Environmental and Applied Chemistry, Kyung Hee University) ;
  • Choi, I-Song (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Oh, Jong-Min (Department of Environmental Science and Engineering, Kyung Hee University)
  • 안태웅 (성균관대학교 무배출형환경기술센터(ZEC)) ;
  • 범봉수 (경인여자대학교 식품영양과) ;
  • 김태훈 (경희대학교 환경응용과학과) ;
  • 최이송 (경희대학교 환경학 및 환경공학과) ;
  • 오종민 (경희대학교 환경학 및 환경공학과)
  • Received : 2012.11.21
  • Accepted : 2013.09.16
  • Published : 2013.09.30
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Abstract

In this study, trend analysis was performed by various runoff analysis method of Non-point Pollution Source(NPS) at the impervious area. The characteristics of rainfall at impervious area appeared to be influenced by rainfall strength and it appeared that first flush phenomenon occurs often if rainfall strength acts largely. It is judged that the measure is required to be prepared against that now that concentration difference of non-point pollution source appeared to be big by precedent number of days of no rainfall. As the result of calculating Decrease Rate (DR) by first flush of non-point pollution source, it is judged that it is important to prepare the measure against the pollutants about initial rain and it is necessary to calculate the capacity of non-point pollution source processing facilities regarding that now that the non-point pollution source integrated at impervious area showed the characteristics that are flowed out in high concentration by initial rain in case of non-rainfall considering the characteristics of non-point pollution source at impervious area. When taking 50% of non-point pollution source as the standard for decrease rate that was evaluated previously, it appeared as 15~60 min in case of TSS and it appeared as 30~90 min in case of organic compound, but the characteristic whose decrease rate is below 50% also appeared even till rainfall-runoff ends. Based on that, it is judged that it could be used as the reference when designing the structural BMPs facilities later.

본 연구에서는 불투수성 지역에서 강우시 비점오염원 유출특성을 파악하고, 다양한 해석방법을 통하여 비점오염물질의 초기유출현상을 규명하고자 하였다. 불투수성 지역에서의 강우사상 특성은 강우강도의 영향을 많이 받는 것으로 나타났으며, 강우강도가 크면 초기유출현상이 뚜렷하게 나타나는 것으로 나타났다. 또한 선행무강우일수에 의해서 비점오염물질의 농도차가 큰 것으로 나타나, 이에 대한 대책 마련이 필요할 것으로 판단된다. 비점오염원의 초기유출에 의한 감소율(DR) 평가 결과, 강우시 불투수성 지역에서의 비점오염 유출특성은 건기시 불투수면에 집적되어 있던 비점오염물질이 초기강우에 의해 높은 농도로 유출되는 경향을 보였기 때문에 초기강우로 인한 비점오염물질에 대한 대책을 마련하는 것은 중요하고, 이와 관련하여 비점오염 처리시설에 대한 용량 산정에 대한 평가도 필요할 것으로 판단된다. 초기유출에 의한 감소율(DR) 경향 분석은 비점오염물질에 대하여 감소율(DR) 50%를 기준으로 조사지점별 강우유출시간을 분석하였는데, TSS는 15~60 min으로 나타났으며, 유기물질은 30~90 min으로 나타나는 경향을 보였지만 강우유출이 끝날 때까지도 감소율(DR)이 50% 이하인 특성도 나타났다. 이를 근거로 하여 향후 구조적 BMPs 시설 설계 시 참고자료로 활용할 수 있을 것으로 판단된다.

Keywords

References

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