Qualitative comparison of the bed level in the pilot side channel (7 February 2017) and bed level changes compared to initial flat bed conditions in the scale model at low water level. Blue indicates erosion and red sedimentation. (Source: Figure 5; Ruijsscher et al. 2018)
In the present study, a physical scale model with mobile bed was used to study morphological patterns and discharge division at the entrance of a side channel with upstream sill, as present at longitudinal training dams. The effect of the geometric design of the sill is of special interest, as this might be used in the field to influence the amount of sediment and water flowing into the side channel. Overall, the most dynamically active system, in which deposited material is eroded as much as possible during high flow, is reached when the sill height decreases in downstream direction. From a qualitatively comparison, experimental results compare reasonably well with the bed level measured in the field pilot.
Findings and implications to practice
From experiments with different geometrical designs of the intake of the LTD side channel, it follows that most of sediment that settles in the side channel at low discharge is eroded again at high discharge. The shape of the intake can be used to control how dynamic this behaviour is. Moreover, the discharge through the side channel can be controlled by changing the cross-sectional area over the sill at the side channel intake.
- de Ruijsscher, T., Naqshband, S., & Hoitink, T. (2018). Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology. E3S Web of Conferences, 40, 05020. https://doi.org/10.1051/e3sconf/20184005020.
- If interested, here is the full list of related conference abstracts and/or (under)graduate thesis with progress results of the main researcher or the contributors to this project.
Application of a line laser scanner for bed form tracking in a laboratory flume
Last modified: 12/05/2019