Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Parameter estimations to improve urban planning area runoff prediction accuracy using Stormwater Management Model (SWMM)

SWMM을 이용한 도시계획지역 유출량 예측 정확도 향상을 위한 매개변수 산정

  • Koo, Young Min (Department of Environmental Engineering, Chungnam National University) ;
  • Seo, Dongil (Department of Environmental Engineering, Chungnam National University)
  • Received : 2017.02.27
  • Accepted : 2017.04.10
  • Published : 2017.05.31
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Abstract

In environmental impact assessments for large urban development projects, the Korean government requires analysis of stormwater runoff before, during and after the projects. Though hydrological models are widely used to analyze and prepare for surface runoff during storm events, accuracy of the predicted results have been in question due to limited amount of field data for model calibrations. Intensive field measurements have been made for storm events between July 2015 and July 2016 at a sub-basin of the Gwanpyung-cheon, Daejeon, Republic of Korea using an automatic monitoring system and also additional manual measurements. Continuous precipitation and surface runoff data used for utilization of SWMM model to predict surface runoff during storm events with improved accuracy. The optimal values for Manning's roughness coefficient and values for depression storage were estimated for pervious and impervious surfaces using three representative infiltration methods; the Curve Number Methods, the Horton's Method and the Green-Ampt Methods. The results of the research is expected to be used more efficiently for urban development projects in Korea.

우리나라에서는 도시 개발사업을 위한 환경영향평가를 실시하는데 있어 개발 전 중 후의 강우유출량을 분석하도록 규정하고 있다. 도시개발에 따른 수문학적 변화를 분석하고 대책을 수립하기 위해 수문모델이 사용되고 있으나 대부분의 경우 현장의 자료가 충분하지 않은 관계로 그 산정결과의 신뢰도가 문제될 수 있다. 본 연구에서는 대전의 관평천 일부유역에서 2015년 7월 부터 2016년 7월 까지 자동 모니터링 장치을 이용하고 또한 및 현장 측정을 통해 확보된 강우량 및 유출유량의 연속자료를 활용하여 SWMM을 이용하는 경우 강우 유출량 예측의 정확도를 제고하고자 하였다. 토양침투량 산정을 위해 대표적으로 사용되는 Curve Number 방법, Horton 방법 및 Green-Ampt 방법들을 사용한 경우에 대해서 투수지역과 불투수 지역에 대해 각각 최적의 Manning 조도계수와 지표면 저류깊이를 산정하여 제시하였다. 본 연구의 결과는 우리나라의 도시 유역에서 실측자료를 이용하여 강우 유출 모델을 보정하였다는 면에서 의미가 있다고 판단되며 추후 유역의 개발등의 상황에 대해는 강우 시 유출량 및 수질현상을 더욱 정확하게 예측하고 나아가서 향후의 유역 내 수문조건 변화 요인에 대한 영향을 분석하는 데 정확도를 향상시킬 수 있을 것으로 기대된다.

Keywords

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