Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Assessment of Water Circulation and Hydro-characteristics with LID techniques in urbanized areas

도시지역에 적용된 LID 기법의 강우시 수문특성 및 물순환 평가

  • Choi, Hyeseon (Department of Civil and Environmental Engineering, Kongju National university) ;
  • Hong, Jungsun (Department of Civil and Environmental Engineering, Kongju National university) ;
  • Jeon, Minsu (Department of Civil and Environmental Engineering, Kongju National university) ;
  • Geronimo, Franz Kevin (Department of Civil and Environmental Engineering, Kongju National university) ;
  • Kim, Leehyung (Department of Civil and Environmental Engineering, Kongju National university)
  • 최혜선 (공주대학교 건설환경공학과) ;
  • 홍정선 (공주대학교 건설환경공학과) ;
  • 전민수 (공주대학교 건설환경공학과) ;
  • 케빈 (공주대학교 건설환경공학과) ;
  • 김이형 (공주대학교 건설환경공학과)
  • Received : 2019.01.25
  • Accepted : 2019.07.25
  • Published : 2019.08.30
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Abstract

High impervious surfaces increase the surface runoff during rainfall and reduces the underground infiltration thereby leading to water cycle distortion. The distortion of water cycle causes various urban environmental problems such as urban flooding, drought, water pollutant due to non-point pollution runoff, and water ecosystem damage. Climate change intensified seasonal biases in urban rainfall and affected urban microclimate, thereby increasing the intensity and frequency of urban floods and droughts. Low impact development(LID) technology has been applied to various purposes as a technique to reduce urban environmental problems caused by water by restoring the natural water cycle in the city. This study evaluated the contribution of hydrologic characteristics and water cycle recovery after LID application using long-term monitoring results of various LID technology applied in urban areas. Based on the results, the high retention and infiltration rate of the LID facility was found to contribute significantly to peak flow reduction and runoff delay during rainfall. The average runoff reduction effect was more than 60% at the LID facility. The surface area of the LID facility area ratio(SA/CA) was evaluated as an important factor affecting peak flow reduction and runoff delay effect.

도시지역의 높은 불투수면은 강우시 지표 유출량을 증가시키고 지하침투량을 줄이면서 물순환을 왜곡시킨다. 왜곡된 물순환은 도시침수와 가뭄, 비점오염유출로 인한 수질오염 및 수생태계 훼손 등의 다양한 도시환경 문제 등을 유발시킨다. 기후변화는 도시강우의 계절적 편중현상을 더욱 심화시키고 도시 미기후에 영향을 줌으로써 도시침수와 가뭄의 강도 및 빈도를 증가시킨다. LID(Low Impact Development) 기법은 도시내 자연적 물순환 체계를 회복함으로써 물로 인하여 발생하는 도시환경문제를 줄일 수 있는 기법으로 다양하게 적용되고 있다. 본 연구에서는 도시지역 내 적용된 다양한 LID 기법의 장기 모니터링 결과를 활용하여 LID 적용 이후 수문특성의 변화와 물순환 회복에 기여도를 평가하기 위하여 수행되었다. LID 시설의 높은 저류량과 침투능력은 강우시 첨두유출 저감과 유출지연에 크게 기여하는 것으로 나타났다. LID 시설에서 강우시 평균 유출저감효과는 60% 이상으로 나타났으며, 유역면적 대비 LID 시설 면적비(Surface area of Catuchment area, SA/CA)와 LID 저류 용량은 첨두유출 저감과 유출지연 효과에 영향을 끼치는 중요한 인자로 평가되었다.

Keywords

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