Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Comparative assessment of urban stormwater low impact strategies equipped with pre-treatment zones

침강지 시설이 조성된 LID 시설의 환경적 영향평가

  • Yano, K.A.V. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Reyes, N.J.D.G. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Jeon, M.S. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Kim, L.H. (Department of Civil and Environmental Engineering, Kongju National University)
  • ;
  • ;
  • 전민수 (공주대학교 건설환경공학과) ;
  • 김이형 (공주대학교 건설환경공학과)
  • Received : 2019.04.24
  • Accepted : 2019.05.21
  • Published : 2019.05.31
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Abstract

Recently, Low impact development techniques, a form of nature-based solutions (NBS), were seen cost-efficient alternatives that can be utilized as alternatives for conventional stormwater management practices. This study evaluated the effectiveness of an infiltration trench (IT) and a small constructed wetland (SCW) in treating urban stormwater runoff. Long-term monitoring data were observed to assess the seasonal performance and cite the advantages and disadvantages of utilizing the facilities. Analyses revealed that the IT has reduced performance during the summer season due to higher runoff volumes that exceeded the facility's storage volume capacity and caused the facility to overflow. On the other hand, the pollutant removal efficiency of the SCW was impacted by the winter season as a result of dormant biological activities. Sediment data also indicated that fine and medium sand particles mostly constituted the trapped sediments in the pretreatment and media zones. Sediments in SCW exhibited a lower COD and TN load due to the phytoremediation and microbiological degradation capabilities of the system. This study presented brief comparison LID facilities equipped with pre-treatment zones. The identified factors that can potentially affect the performance of the systems were also beneficial in establishing metrics on the utilization of similar types of nature-based stormwater management practices.

최근 강우유출수를 비용효율적으로 관리하기 위해 저영향개발 (Low Impact Development, LID)과 자연기반해법(Nature-based solution, NBS)를 도입하고 있다. 본 연구에서는 LID 시설 중 도심지 내 적용가능하고 유입부에 침강지가 조성된 침투도랑(IT)과 소규모 인공습지(SCW) 등 2개의 시설에 대해 효율성을 평가하였다. 효율성 평가는 장기간의 모니터링을 통한 자료를 이용하여 수행하였다. 분석결과 하절기 기간은 식생의 흡입 등의 생물학적 활동으로 인하여 SCW의 효율이 더 높았으나, 동절기 기간에는 식물의 고사로 인하여 IT의 효율이 더 높은것으로 분석되었다. 침강지 내 퇴적물의 분석결과 SCW 침강지 내 식생에 의한 정화작용 및 미생물등의 생물학적 처리기작으로 인하여 COD와 TN의 저감효율이 높은것으로 분석되었다. 본 연구에서는 침강지 시설을 조성한 LID 시설에 대해 비교하였으며, 자연과 유사한 자연기반해법을 LID 시설에 적용할 경우 기존 시설보다 처리효율이 우수한것으로 나타났다.

Keywords

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Fig. 1. Schematic diagram of the a) IT located and b) SCW located at Kongju National University

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Fig. 2. Box plot definition.

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Fig. 3. Background inflow and outflow pollutant concentrations in the IT and SCW.

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Fig. 4. Seasonal inflow and outflow unit pollutant loads in the a) IT and b) SCW.

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Fig. 5. Particle size distribution and sedimentation rate in the a) IT and b) SCW.

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Fig. 6. Mean pollutant load distribution in the a) IT and b) SCW sediments

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Fig. 7. Comparison between mean sediment and influent stormwater pollutant loads in the a) IT and b) SCW

Table 1. Facility design and catchment area characteristics

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Table 2. Summary of monitored rainfall events

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