Experimental study of turbulent kinetic energy of flow over scoured riverbed
- 1University of Zagreb, Faculty of Civil Engineering, Department of Hydroscience and Engineering, Zagreb, Croatia (gordon.gilja@grad.unizg.hr)
- 2University of Zagreb, Faculty of Civil Engineering, Zagreb, Croatia
- 3University of Zagreb, Faculty of Civil Engineering, Department of Hydroscience and Engineering, Zagreb, Croatia
- 4University of Zagreb, Faculty of Civil Engineering, Department of Hydroscience and Engineering, Zagreb, Croatia
Rapid development of the instantaneous flow velocity instruments allows for high frequency measurement of turbulent flow field in the hydraulic flume. To obtain accurate and reliable flow measurement it is necessary to correctly configure the instrument using the manufacturer’s general guidelines. When instruments are used in highly turbulent flows, such as flows around bridge piers, selection of parameters is not straightforward and it generally requires validation against known data. In this study, experimental flow velocity data was collected in the hydraulic flume at three characteristic cross-sections – bridge profile, and upstream, and downstream profile. Velocity was measured on 10 points for each cross-section using Nortek Vectrino Profiler. Velocity measurements were processed to calculate turbulent kinetic energy at discrete points, after which TKE map was interpolated over the entire cross-section using QGIS. Results of TKE maps are compared for two characteristic flow rates and changes in TKE distribution respective to the flow downstream analyzed to quantify influence of the bridge pier and scour protection on the flow in the bridge vicinity.
Acknowledgments
This work has been supported in part by Croatian Science Foundation under the project R3PEAT (UIP-2019-04-4046)
How to cite: Gilja, G., Drandić, L., Fliszar, R., and Harasti, A.: Experimental study of turbulent kinetic energy of flow over scoured riverbed, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-11685, https://doi.org/10.5194/egusphere-egu23-11685, 2023.