Development of simultaneous measuring method of flood flow, bed load velocity and suspended sediment using ADCP

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We developed a bed-load discharge measurement system based on ADCP in the experimental flume and applied it to actual river. In order to verify the applicability of this method, flood flow observation by using tethered boat equipped with ADCP and RTK-GPS were conducted in several Japanese rivers with different grain size. The output data were compared with conventional formula and results of 2D bed deformation analysis using observed discharge and water level data.As a result, relationship between non-dimensional shear stress and non-dimensional bed-load discharge estimated by author's method showed similar tendency with conventional formula even though shear velocity calculated from vertical velocity distribution was larger than the other calculated values. Moreover, practical observation routine of flood discharge and bed-load were suggested by the combination with stationary and moving observation.