Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Assessment of Small Mountainous Catchment Runoff at Yongdam-dam Guryang

산지 소규모 유역의 유출 특성 평가-용담 구량천

  • Kim, Seong-Goo (School of Civil Engineering, Chungbuk National University) ;
  • Chang, Hyung-Joon (School of Civil Engineering, Chungbuk National University) ;
  • Lee, Hyo-Sang (School of Civil Engineering, Chungbuk National University)
  • Received : 2018.02.01
  • Accepted : 2018.04.06
  • Published : 2018.04.30
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Abstract

The risk of disasters, such as floods and drought, has increased. Reliable hydrological data is important for analyzing the water resource and designing hydraulic structure to manage these risks. The Yongdam Guryang river catchment located in the central of Korea is the research catchment of K-water and UNESCO IHP, and the hydrological data, such as rainfall, runoff, evapotranspiration, etc. has been observed at the catchment. The aim of this study was to assess the runoff characteristics of the small mountainous catchment of Korea based on the observed hydrological data, and the Probability Distributed Model was applied as the Rainfall-Runoff Model at the Yongdam Guryang river catchment. The hydrological data was divided into the wet period from June to September and dry period from October to May according to data analysis. The runoff ratio was 0.27~0.41 in the wet period and 0.30~0.45 in the dry period. The calibration result by the Probability Distributed Model showed a difference in the calibrated model parameters according to the periods. In addition, the model simulated the runoff accurately except for the dry period of 2015, and the result revealed the applicability of the PDM. This study showed the runoff characteristics of the small mountainous catchment by dividing the hydrological data into dry and wet periods.

최근 들어 홍수와 가뭄과 같은 자연 재해의 위험이 증가하고 있다. 이러한 위험을 저감하기 위하여 신뢰할 수 있는 수문자료는 수자원 분석 및 수공구조물 설계에 있어 매우 중요하다. 한국의 중부에 위치한 용담 구량천 유역은 K-water와 UNESCO IHP의 연구유역으로써 신뢰 할 수 있는 강수량, 유출량, 증발산량 등의 수문자료를 제공하고 있다. 본 연구는 실측된 수문자료를 바탕으로 우리나라의 산지 유역의 유출 특성을 분석하기 위하여 용담 구량천 유역에서의 유출특성을 Probability Distributed Model을 적용하여 분석하였다. 분석 결과, 유역 유축을 홍수기(6월-9월), 평수기(10-5월)로 기간 분리하여 분석하는 것이 필요함을 확인하였다. 유역 유출비가 홍수기에는 0.27~0.41, 평수기에는 0.30~0.45의 분포를 나타내고 있다. Probability Distributed Model은 적용기간에 따라 차별화된 검정 매개변수를 제시하고 있다. 또한, 2015년 평수기를 제외하고 다른 기간은 유역의 유출을 모두 적합(Nash Surcliffe Efficiency >0.7)하게 모의하고 있어 모형의 적용성을 확인하였다. 본 연구는 Probability Distributed Model을 활용한 기간분리를 통한 소규모 산지 유역의 유출특성방법을 제시한다.

Keywords

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