We computed parameters that affect velocity distribution by applying Chiu’s two-dimensional velocity distribution equation based on the theory of entropy probability and acoustic doppler current profiler (ADCP) of Jungmun-stream, Akgeun-stream, and Yeonoe-stream among the nine streams in Jeju Province between July 2011 and June 2015. In addition, velocity and flow were calculated using a surface image velocimeter to evaluate the parameters estimated in the velocity observation section of the streams. The mean error rate of flow based on ADCP velocity data was 16.01% with flow calculated using the conventional depth-averaged velocity conversion factor (0.85), 6.02% with flow calculated using the surface velocity and mean velocity regression factor, and 4.58% with flow calculated using Chiu’s two-dimensional velocity distribution equation. If surface velocity by a non-contact velocimeter is calculated as mean velocity, the error rate increases for large streams in the inland areas of Korea. Therefore, flow can be calculated precisely by utilizing the velocity distribution equation that accounts for stream flow characteristics and velocity distribution, instead of the conventional depth-averaged conversion factor (0.85).

Abstract
 1. 서 론
 2. 연구 방법
  2.1. 연구대상 하천
  2.2. 관측자료
  2.3. Chiu-2차원 유속분포식
 3. 결과 및 고찰
  3.1. 평균유속분포 특성 및 해석
  3.2. 실측자료 비교·분석에 의한 매개변수의 적정성 검토
  3.3. 자연하천의 현장유량 검증
 4. 결 론
 REFERENCES

• 양세창(제주특별자치도의회) | Se-Chang Yang (Jeju Special self-governing provincial council)
• 양성기(제주대학교 토목공학과) | Sung-Kee Yang (Department of Civil Engineering, Jeju National University) Corresponding author
• 김용석(제주대학교 토목공학과) | Yong-Suk Kim (Department of Civil Engineering, Jeju National University)