Related Experiment Video
Updated: Dec 31, 2025

Image-based Lagrangian Particle Tracking in Bed-load Experiments
Published on: July 20, 2017
Large eddy simulation of the hydrodynamic behavior of horizontal side jets in compound open channels with vegetated
Yizhou Xiao1,2,3,4,5, Zhonghua Yang6, Feifei Wang1
1State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China.
Abstract:
Understanding the hydrodynamic behavior of side jets in compound open channels with vegetated floodplain is crucial to jet dilution, sediment transport, and bank stability. Large eddy simulation was used to study horizontal side jets in compound open channels with vegetated floodplain. Predicted mean velocity, turbulent kinetic energy, and secondary currents were compared with experimental data, with a good agreement between measured and calculated data. Analyses of bed shear stress showed that vegetation in the floodplain increases the total drag and decreases bed shear stress, thus governing sediment transport and protecting the bank. The transport mechanism was quantitatively investigated by the quadrant analysis, concentration, and Reynolds flux. The ejection and sweep events were major contributors to the momentum and scalar flux transport. Analyses of concentration and Reynolds flux showed that the secondary flow influenced the spreading of the jet and the location of the concentration peaks, and the distribution of concentration and Reynolds flux did not strictly follow Fickian law in the whole region due to the effect of secondary flow on the concentration distributions. Additionally, the typical vortexes and spatiotemporal evolution of vortex structures in compound open channels, especially those near the junction between the main channel and floodplain, were successfully demonstrated.
Related Concept Videos
Energy Considerations in Open Channel Flow
Rapidly Varying Flow
Bernoulli's Equation for Flow Along a Streamline
Uniform Depth Channel Flow: Problem Solving
Free Jet
Gradually Varying Flow

