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Comparison of Flood Discharge and Velocity Measurements in a Mountain Stream Using Electromagnetic Wave and Surface Image

전자파와 수표면 영상을 이용한 산지하천 홍수유량 및 유속 계측 비교 연구

  • Yang, Sung-Kee (Department of Civil Engineering, Jeju National University) ;
  • Kim, Dong-Su (Department of Civil & Environmental Engineering, Dankook University) ;
  • Yu, Kwon-Kyu (Department of Civil Engineering, Dong-eui University) ;
  • Kang, Meyong-Su (Department of Civil Engineering, Jeju National University) ;
  • Jung, Woo-Yul (Department of Civil Engineering, Jeju National University) ;
  • Lee, Jun-Ho (Department of Civil Engineering, Jeju National University) ;
  • Kim, Yong-Seok (Department of Civil Engineering, Jeju National University) ;
  • You, Ho-Jun (Department of Civil & Environmental Engineering, Dankook University)
  • 양성기 (제주대학교 토목환경공학과) ;
  • 김동수 (단국대학교 토목환경공학과) ;
  • 류권규 (동의대학교 토목환경공학과) ;
  • 강명수 (제주대학교 토목환경공학과) ;
  • 정우열 (제주대학교 토목환경공학과) ;
  • 이준호 (제주대학교 토목환경공학과) ;
  • 김용석 (제주대학교 토목환경공학과) ;
  • 유호준 (단국대학교 토목환경공학과)
  • Received : 2012.04.09
  • Accepted : 2012.06.11
  • Published : 2012.06.30

Abstract

Due to the difficulties for measuring flood discharge in the dangerous field conditions, conventional instruments with relatively low accuracy such as float still have been widely utilized for the field survey. It is also limited to use simple stage-discharge relationship for assessment of the flood discharge, since the stage-discharge relationship during the flood becomes complicated loop shape. In recent years, various non-intrusive velocity measurement techniques such as electromagnetic wave or surface images have been developed, which is quite adequate for the flood discharge measurements. However, these new non-intrusive techniques have little tested in the flood condition, though they promised efficiency and accuracy. Throughout the field observations, we evaluated the validity of these techniques by comparing discharge and velocity measurements acquired concurrently during the flood in a mountain stream. As a result, the flood discharge measurements between electromagnetic wave and surface image processing techniques showed high positive relationship, but velocities did not matched very well particularly for the high current speed more 3 m/s. Therefore, it should be noted here that special cares are required when the velocity measurements by those two different techniques are used, for instance, for the validation of the numerical models. In addition, authors assured that, for the more accurate flood discharge measurements, velocity observation as well as stage height is strongly necessary owing that the unsteady flow occurs during the flood.

Acknowledgement

Supported by : 국토해양부

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