FUNDAMENTAL EXAMINATION OF SIMULTANEOUS OBSERVATION TECHNIQUE FOR FLOOD FLOW, BED AND SUSPENDED LOAD USING ADCP

Abstract

In this paper, the authors conducted the simultaneous observation of flood flow and moving bed velocity by using tethered boat equipped with ADCP and the Real Time Kinematic Global Positioning System (RTK-GPS) in Shimanto River during medium flooding. With this measurement system, moving bed velocity at each position was estimated with subtracting moving velocity vector of the boat estimated by RTK-GPS from velocities obtained by ADCP bottom trucking function. As the results of transverse observation with discharge of 3000m3/s, cross-sectional profiles of flow and moving bed velocity were obtained. Moreover, we examined measurement technique of the Acoustic Backscatter Turbidity (ABT) with ADCP.