Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Hydrologic and Hydraulic Factors Affecting the Long-term Treatment Performance of an Urban Stormwater Tree Box Filter

도시 강우유출수를 처리하는 나무여과상자의 장기 처리효율에 영향을 주는 수리학적 및 수문학적 인자 연구

  • Geronimo, Franz Kevin F. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Hong, Jungsun (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Kim, Lee-Hyung (Department of Civil and Environmental Engineering, Kongju National University)
  • ;
  • 홍정선 (국립공주대학교 건설환경공학과) ;
  • 김이형 (국립공주대학교 건설환경공학과)
  • Received : 2017.10.26
  • Accepted : 2017.11.23
  • Published : 2017.11.30
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Abstract

Tree box filters, an example of bioretention systems, were compacted and versatile urban stormwater low impact development technique which allowed volume and water quality treatment performance to be adjusted based on the hydrologic, runoff quality and catchment characteristics. In this study, the overall performance of a 6 year-old tree box filter receiving parking lot stormwater runoff was evaluated. Hydrologic and hydraulic factors affecting the treatment performance of the tree box filter were also identified and investigated. Based on the results, the increase in rainfall depth caused a decrease in hydrologic and hydraulic performance of the tree box filter including volume, average flow, and peak flow reduction (r = -0.53 to -0.59; p<0.01). TSS, organics, nutrients, and total and soluble heavy metals constituents were significantly reduced by the system through media filtration, adsorption, infiltration, and evapotranspiration mechanisms employed in the tree box filter (p<0.001). This significant pollutant reduction by the tree box filter was also found to have been caused by hydrologic and hydraulic factors including volume, average flow, peak flow, hydraulic retention time (HRT) and runoff duration. These findings were especially useful in applying similarly designed tree box filter by considering tree box filter surface area to catchment area of less than 1 %.

식생체류지 기법 중 하나인 나무여과상자는 유역면적 및 강우유출수의 특성에 따라 기법의 용적 및 수질 저감 능력 조정이 가능한 도시 저영향개발 기술이다. 본 연구는 주차장 강우유출수 처리를 위해 6년동안 운영된 나무여과상자의 성능을 평가하기 위하여 수행되었다. 또한 나무여과상자의 저감 능력에 영향을 미치는 수리 수문학적 요인들을 조사하였다. 분석 결과, 강수량의 증가는 나무여과상자의 유출량, 평균유량 및 첨두유량 감소 등의 수리 수문학적 성능이 감소되는 것으로 평가되었다(r = -0.53 to -0.59; p < 0.01). TSS, 유기물, 영양물질 및 중금속 등의 오염물질은 나무여과상자 내 충진된 여재의 여과 및 흡착, 침투, 증산발 기작 등을 통하여 저감되는 것으로 나타났다(p < 0.001). 또한 유출량, 평균유량, 첨두유량, 체류시간 및 강우지속시간 등과 같은 수리 수문학적 요인의 영향을 받는 것으로 평가되었다. 이는 나무여과상자 시설을 유역면적 대비 시설의 표면적을 1 % 미만으로 설계 시 특히 유용한 것으로 나타났다.

Keywords

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