DISCHARGE OBSERVATION BASED ON SPATIAL DISTRIBUTION OF VELOCITY IN A RIVER CHANNEL

Abstract

 This study aims to obtain river discharge with spatial distribution of velocity by video image analysis. Target event is the experiment at the Chiyoda Experimental Flume in June 2021. First, Particle Image Velocimetry with geometric transformation by information of angle of camera and distance from camera to water surface was conducted. The observed velocity by PIV was compared with the velocity by a radio wave current meter, which showed a reasonable accuracy. Secondly, discharge calculated with the velocity distribution by PIV, observed water level and estimated river bed elevation by hydraulic resistance theory showed a good agreement with the actual discharge in the experimental flume.