2024 Volume 80 Issue 16 Article ID: 23-16049
In this paper, we focus on the phenomenon of upstream migration of waterfalls in bedrock rivers. We conducted laboratory-scale experiments to investigate the process of upstream migration in mild slope channel, focusing the longitudinal changes in flow velocity and sediment transport velocity that cause this migration. The experimental results showed that step erosion was observed in the supercritical flow section immediately upstream of the edge of the waterfall. PIV and PTV measurements on the fixed bed revealed that the spacing of the vertical sediment transport velocity increase in the longitudinal direction was similar to the step spacing.
