EVALUATION OF IMAGING TECHNIQUE ACCURACY FOR DISCHARGE MEASUREMENT AND DEVELOPMENT OF REAL TIME SYSTEM FOR SURFACE FLOW MEASUREMENT

摘要

The monitoring of river flow is a matter of vital importance to the management of river flows as well as the utilization of rivers and their environments. As for the flow measurement by imaging techniques using a monitoring camera, skepticism has still remained about the fundamental of the method. Therefore, in order to confront such skepticism we conducted concurrent measurements of a river flow by using imaging techniques as well as ADCP at the upstream of Tone River. It was made clear that the water surface velocity distributions measured by imaging techniques agree fairly well with the velocity distribution at the water surface extrapolated from ADCP. At the same time, we established a real time system of surface flow measurement by introducing a novel image collection system with high image compressibility. The performance of this system was confirmed by applying it to a small flood that occurred in the Sumiyoshi River.