AN APPLICATION OF HIGH-RESOLUTION ACOUSTIC DOPPLER CURRENT PROFILER INTO A FLOOD-FLOW MEASUREMENT

Abstract

An acoustic doppler current profiler with low noise data and high resolution (HR-ADCP) recently developed has high potential to measure shallow-water flow like flood flow in river. In the present study, to examine the vertical structure of flood flow in river, we have attempted to apply the HR-ADCP into a flood-flow measurement in the Edo River. The observed data shows characteristic vertical structure of the velocity in the main channel that the relation between water elevation and velocity in the surface layer is quite different from that in the bottom layer. It is also noted that the friction velocity and vertical current profile in the main channel vary considerably in the rising and falling stages of the flood.