Abstract
A method of aerial photo analysis of flood flow presented by Minoura et al. was improved and applied to a flow through the confluence of the Tone River and the Watarase River where the angle between the low water channel is 40 degrees. The proposed method is composed by two parts; image correlation analysis by a computer and manual correction by stereo visualization. In the first part, result from conventional correlation analysis was rearranged by inspection through a stereoscope. In the second part, a routine for stereo image rotation was introduced to increase accuracy of analysis for streamlines having a large angle to the flight direction. The flow characteristics at the confluence were discussed based on the results obtained from the analysis.
