| To overcome difficulty of bed-load discharge measurement、Yorozuya et al. (2009、2010b) developed a bed-load discharge measurement system based on Acoustic Doppler Current Profiler (ADCP) and conducted it in an experimental flume. The authors applied the system in the actual river during medium flooding as well normal flow. The output of the system was compared with the conventional formula、which is commonly employed by Japanese engineers、as well as a sediment sampler. To compare the bed-load discharges from different methods、authors employed the bed-load velocity as agency for justifi-cation. As a result、authors indicated difficulty of conventional formula、since estimation of shear velocity is not easy. From this point of view、authors can concluded that the method presented in this paper has ad-vantage、since most of the properties for estimation can be obtained by ADCP. Finally、the authors con-cluded the applicability of the current method as up to flat bed condition. |
