第四部門：流体力学（B)

[S04B-04] Hydraulic Experiments on the Development of Sand Waves in Backwater Section

*Yu INAMI¹, Tomoko KYUKA², Satomi YAMAGUCHI¹, Yasuhiro YOSHIKAWA³ (1. Civil Engineering Research Institute for Cold Region, 2. Hokkaido University, 3. Kitami Institute of Technology)

Keywords:Back Water, Sand Waves, Blue Laser

We conducted hydraulic experiments to understand 1) the development of sand waves in response to the water level at the downstream end of the flume and 2) the influence of sand waves on the water level. The spatial measurements of the riverbed were carried out using a blue laser, and its validity is discussed in this study. The experimental results show that the wavelength and height of sand waves measured by the blue laser were almost identical to those measured by visual observation. The root-mean-square error RMSE is 0.02 m when the bed height measured by the blue laser is compared with the bed height measured visually. Our study shows that the blue-laser method is an efficient technique for the spatial measurement of the riverbed.