Accuracy of the Correlation Method and its Application to Aerial Photographs of Flood Flow

Abstract

The accuracy of the correlation method is examined by simulating particle movements under uniform parallel flows and uniform shear flows. Particle images are produced by decomposing each pixel into 9x9 sub-pixels and shifting particle patterns in a sub-pixel unit. This method is also applied to the aerial photographs taken during floods. The results show a reasonable velocity distribution reflecting the river bed configuration and a large scale structure of the flow along theedge of the lower bank.