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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)
  • 김성구 (충북대학교 토목공학부) ;
  • 장형준 (충북대학교 토목공학부) ;
  • 이효상 (충북대학교 토목공학부)
  • Received : 2018.02.01
  • Accepted : 2018.04.06
  • Published : 2018.04.30

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.

Keywords

IHP;Small mountainous catchment;PDM;Runoff characteristics;Yongdam-dam Catchment

Acknowledgement

Supported by : 충북대학교

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