2. Experimental Set-up and Procedure, and Data Processing
2.1. Experimental Set-Up and Procedure
2.2. Data Processing
3. Results and Discussion
3.1. Bed Morphology
3.2. Average Flow Field
3.2.1. Data Presentation
3.2.2. Approach Flow Zone ( m)
3.2.3. Flow Deflection Zone in the Main Channel ( m 0.70 m)
3.2.4. Diversion Entrance Zone (0.67 m 0.95 m)
3.2.5. Flow Recovery Zone ( 0.70 m)
3.3. Turbulent Kinetic Energy
- The vanes altered their near velocity field by creating tip vortices around them. The combination of the vane-induced circulation and the streamwise velocity caused a longitudinal vortex all along the vane-field, right from the most upstream vanes, which persisted downstream of the diversion, for a distance of between eight to ten times the flow depth.
- The longitudinal vortex was not identified in front of the diversion entrance in the absence of the vanes. In this case, the main channel vortex initiated downstream of the diversion due to the impact of the deflected flow on the inner lateral wall of the main channel.
- The flow deflection towards the diversion channel was enhanced above the vanes in the presence of the vane-field.
- The scoured trench inside the diversion was slightly deeper in the presence of vanes, whereas the bed material excavated along the vane-field originated a sediment deposition further downstream.
- The vanes also originated downflows along their downstream faces which caused scour in the experiment with vanes.
- The vanes increased the dimensions of the separation zone identified inside the diversion channel relative to the vanes-free case, slightly decreasing the conveyance at equal flow levels.
- The increase of the size of the separation zone in the case of vane-field was accompanied by the decrease of the velocity magnitude as well as of the flow turbulent kinetic energy inside that zone.
- A rising flow zone, characterized by high turbulent kinetic energy, was observed, supposedly for the first time, side by side, underneath or immediately downstream of the separation zone, in both experiments, though it was clearly more pronounced in the experiment without vanes.
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