표면영상유속계(SIV)를 이용한 한천의 홍수유출량측정

Abstract

Surface Image Velocimetry(SIV) is an instrument to measure water surface velocity by using image processing techniques. Since SIV is 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, an surface imaging velocimetry system was used to calculate the flow rate for flood event due to a typhoon. At the same time, two type of electromagnetic surface velocimetries (electromagnetic surface current meter and Kalesto) were used to observe flow velocities ??and compare the accuracies of each instruments. The comparison showed that for velocity distributions root mean square error(RMSE) was 0.15 and R-squared was 0.79. For discharge measurements, RMSE reached 4.59 and R-squared did 0.95. It means that surface image velocimetry could be used as an alternative method for electromagnetic surface velocimetries in measuring flood discharge.