Journal of the Korean Society of Hazard Mitigation (한국방재학회 논문집)

Korean Society of Hazard Mitigation (한국방재학회)
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Study on Stormwater Runoff Reduction Effects by LID Application Areas

LID 적용면적별 우수유출 저감효과 분석

  • Received : 2014.02.05
  • Accepted : 2014.03.03
  • Published : 2014.04.30
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Abstract

LID(Low Impact Development) techniques, the distributed facilities, have been recently planed and implemented for stormwater runoff reduction tools, because the centralized facilities for flood controls were limited in reducing urban stormwater runoff amount. Thus, this study has analyzed the stormwater runoff reduction effects by application areas of the representative LID element techniques such as the green roof(GR) and the permeable pavement(PP). Three selected LID features, GR, PP, and both of them(GR+PP), were respectively applied with the four installation area ratios(0, 25, 50, 75, and 100%) to the actual areas of roofs and roads available in a frequently inundated basin under study utilizing SWMM(Storm Water Management Model) LID Controls. The SWMM-LID simulation results represent that the increase of installation areas of the three LID features can reduce the stormwater runoff in both peak discharges and runoff volumes. It is also observed that the GR application with 25% area ratio, the PP application with 75% area ratio, and the GR+PP application with 50% area ratio are most effective, respectively for the stormwater runoff reduction by LID installation areas.

도심유역 강우유출량 저감을 위한 집중형 유출저감시설의 한계점 때문에, 최근 분산형 유출저감시설인 저영향개발(Low Impact Development; LID) 기술이 계획 및 적용되고 있다. 따라서 본 연구에서는 옥상녹화와 투수성포장과 같은 대표적인 LID 요소기술을 대상으로 적용면적에 따른 우수유출 저감효과를 분석하였다. 옥상녹화, 투수성표장, 그리고 두 기술의 복합적용 등 3가지 경우로 선택된 LID요소기술은 상습침수유역을 연구대상으로 각각 실제 지붕 및 도로 면적에 대한 0, 25, 50, 75, 100% 등의 4가지 적용비율에 따라 SWMM모형내의 LID 기법을 이용하여 적용되었다. SWMM-LID 모의결과, 3가지 경우의 LID 적용기술 모두 설치면적이 증가함에 따라 우수유출의 첨두유출량과 총유출량 모두 저감되는 것으로 나타났다. 또한 옥상녹화의 경우 적용가능한 면적에 25%적용, 투수성포장의 경우는 75%적용, 복합적용은 50%를 적용하는 것이 각 LID요소기술 설치면적 대비 우수유출량 저감에 가장 효과적인 것으로 분석되었다.

Keywords

Acknowledgement

Supported by : 국토교통부

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