The present study aims to apply a surface image velocimetry(SIV) system to video images captured with CCTV and estimate the flood discharge. The CCTV was installed at the Hancheon Bridge of the Han Cheon in Jeju Island for disaster surveillance, and seven flood events occurred in 2012 were used. During the image analyses, input parameters, interrogation areas and searching areas were determined with proper calibration procedures. To check for accuracy and applicability of SIV, the velocities and flood discharges estimated by SIV were compared with the measured ones by an electromagnetic surface velocimeter, Kalisto. The comparison results showed fairly good agreements. The RMSE(Root Mean Square Error) values between two instruments showed a range of 4.13 and 14.2, and the determination coefficients reached 0.75 through 0.85. It means that the SIV could be used as a good alternative method for other traditional velocity measuring instruments in measuring flood discharges.

Abstract
 1. 서 론
 2. 연구대상 하천
 3. 연구방법
  3.1 관측자료
  3.2 표면영상유속계(SIV)의 적용
 4. 결과 및 고찰
  4.1 집중호우(2012. 4. 21)의 유출사상
  4.2 집중호우(2012. 4. 25)의 유출사상
  4.3 제7호 태풍 카눈(KHANUN, 2012. 7. 18)의 유출사상
  4.4 집중호우(2012. 8. 23)의 유출사상
  4.5 제15호 태풍 볼라벤(BOLAVEN, 2012. 8. 28)의 유출사상
  4.6 제14호 태풍 덴빈(TEMBIN, 2012. 8. 30)의 유출사상
  4.7 제16호 태풍 산바(SANBA, 2012. 9. 16)의 유출사상
 5. 요약 및 결론
 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) | Kwonkyu Yu (Department of Civil Engineering, Dong-eui University)
• 김동수(단국대학교 토목환경공학과) | Dong-Su Kim (Department of Civil & Environmental Engineering, Dankook University)