Surface Image Velocimetry(SIV) is an instrument to measure water surface velocity by using image processing techniques. Since SIV is a non-contact type measurement method, it is very effective and useful to measure water surface velocity for steep mountainous streams, such as streams in Jeju island. In the present study, a surface imaging velocimetry system was used to calculate the flow rate for flood event due to a typhoon. At the same time, two types of electromagnetic surface velocimetries (electromagnetic surface current meter and Kalesto) were used to observe flow velocities and compare the accuracies of each instrument. The comparison showed that for velocity distributions root mean square error(RMSE) was 0.33 and R-squared was 0.72. For discharge measurements, root mean square error(RMSE) reached 6.04 and R-squared did 0.92. It means that surface image velocimetry could be used as an alternative method for electromagnetic surface velocimetries in measuring flood discharge.

Abstract
 1. 서 론
 2. 연구재료
 3. 연구방법
  3.1. 표면영상유속계
  3.2. 전자파표면유속계
  3.3. 표면영상유속계와 전자파표면유속계를 이용한 유속및 유량 측정
 4. 결과 및 고찰
 5. 결 론
 참 고 문 헌

• 김용석(제주대학교 토목공학과) | Yong-Seok Kim (Department of Civil Engineering, Jeju National University)
• 양성기(제주대학교 토목공학과) | Sung-Kee Yang (Department of Civil Engineering, Jeju National University) Corresponding author
• 류권규(동의대학교 토목공학과) | Kwon-kyu Yu (Department of Civil Engineering, Dong-eui University)
• 김동수(단국대학교 토목환경공학과) | Dong-su Kim (Department of Civil & Env. Engineering, Dankook University)