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

  • 제15권4호
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  • Pages.87-96
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  • 2015
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  • 1738-2424(pISSN)
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  • 2287-6723(eISSN)
한국방재학회 (Korean Society of Hazard Mitigation)
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침투해석을 통한 토양특성분류별 유출계수 산정

Estimation of Runoff Coefficient through Infiltration Analysis by Soil Type

  • 이재준 (금오공과대학교 토목환경공학부) ;
  • 곽창재 (국립재난안전연구원 방재연구실) ;
  • 박희섭 ((특)한국방재협회 자연재해저감기술개발사업단)
  • Lee, Jaejoon (School of Civil and Environmental Engineering, Kumoh National Institute of Technology) ;
  • Kwak, Changjae (Disaster Research Dept., National Disaster Management Institute) ;
  • Park, Heeseob (Natural Hazard Mitigation Research Group, Korea Disaster Prevention Association)
  • 투고 : 2015.04.09
  • 심사 : 2015.06.04
  • 발행 : 2015.08.31
⟨ 이전 논문 다음 논문 ⟩

초록

본 연구는 기존의 유출계수의 산정법에 대한 조사 및 분석을 통하여 유출계수 산정의 문제점을 제시하고 새로운 방법을 제시하는데 그 목적이 있다. 먼저, NRCS CN의 기준에 의한 유효우량 분리법을 통해 유출계수를 산정하는 방법을 강우강도와 토양 특성, 유역경사를 변경해가면서 가상유역에 적용하였다. 또한, 유역에 발생하는 강우의 크기와 토양의 성질에 따라 유출계수에 직접적인 영향을 미치는 침투량이 달라지는 점에 착안하여 지표 및 지표하 유출해석이 동시에 수행 가능한 커플링 모델을 이용하여 NRCS CN을 적용한 가상 유역에 대해 침투해석을 실시하였다. 새로운 유출계수의 산정의 적합성을 판단하기 위하여 실유역인 설마천 유역의 산림지역에 대하여 NRCS CN법에 의한 방법과 커플링 모델의 침투해석을 통해 산정한 유출계수를 상호비교 하였다. 사방교 유역과 전적비교 유역에 대한 적합성 검토결과 NRCS CN법과 커플링 모델을 활용한 방법 모두 미국 토목학회의 제안수치를 포함하고 있으나, 두 가지 방법 모두 상한치에 대한 범위는 높게 나타났다. 따라서, 유역에 대한 유출계수 선정은 기존에 제시되어 있는 기준을 그대로 사용하는 것보다 강우의 크기와 토양의 특성 및 성질에 따른 침투해석을 실시하는 것이 바람직할 것이다.

Some existing methods of runoff coefficient have a problem to produce subjective value such a runoff coefficient in rational formula. In this study a new method to estimate the runoff coefficient is suggested through the infiltration analysis based on the comparative results of the existing runoff coefficient method. The effect of rainfall intensity and soil characteristics to runoff coefficient is also analyzed by the FFC-COBRA model and effective rainfall separation method based on NRCS CN. Parameters affected to estimate runoff coefficient are chosen, and effects of each parameter are analyzed after applying various cases.runoff coefficient is simulated after supplying the condition of land use and soil type at the actual watershed(Seolma-cheon catchment) area for determining suitability of new method to estimate the runoff coefficient. This result shows that runoff coefficient in this study is not only in the range of runoff coefficient, but also over the upper limit of 0.10~0.22 at 'forest, etc' from ASCE. Therefore, runoff coefficient in rational formula has to modify an upward adjustment in Korea. A new method to estimate runoff coefficient by infiltration analysis can be used practical purpose in domestic circumstances.

키워드

과제정보

연구 과제번호 : 기획·기본연구 및 국민안전확보기술개발 운영

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