Abstract
We conducted flume experiments to study the flow behavior around a debris accumulation at a two-pier bridge. An Acoustic Doppler Velocimetry was utilized to measure velocity in cases with and without debris. We examined the impact of this accumulation on the velocity field and bed shear stress to better understand the flow and sediment transport mechanisms near the debris buildup at the bridge. Debris clusters were found to cause strong downward flows behind the bridge piers and to create turbulent shear layers emanating from the debris base. These flow patterns caused an increase in bed shear stress behind the piers by up to 40%. Downstream of the bridge, the debris-induced bed shear stress increase persisted for a distance equivalent to four times the spacing between the piers.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIT) (No. NRF-2022R1A2C2006915 and NRF-2022R1A4A3032838). This work was also supported by Korea Environment Industry & Technology Institute (KEITI) through R&D Program for Innovative Flood Protection Technologies against Climate Crisis Program (or Project), funded by Korea Ministry of Environment (MOE) (RS-2023-00218873).
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Jeon, J., Kim, Y., Kim, D. et al. Flume Experiments for Flow around Debris Accumulation at a Bridge. KSCE J Civ Eng 28, 1049–1061 (2024). https://doi.org/10.1007/s12205-024-1442-4
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DOI: https://doi.org/10.1007/s12205-024-1442-4