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Article

Scour Hole Development in Natural Cohesive Bed Sediment around Cylinder-Shaped Piers Subjected to Varying Sequential Flow Events

1
Department of Water Resources Engineering, Faculty of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh
2
Department of Civil and Environmental Engineering, Tickle College of Engineering, The University of Tennessee, Knoxville, TN 37996, USA
3
Tennessee Department of Transportation, 6601 Centennial Blvd, Nashville, TN 37243, USA
*
Author to whom correspondence should be addressed.
Water 2021, 13(22), 3289; https://doi.org/10.3390/w13223289
Received: 8 October 2021 / Revised: 4 November 2021 / Accepted: 16 November 2021 / Published: 20 November 2021
(This article belongs to the Section Water Erosion and Sediment Transport)
Scour evolution and propagation around a cylinder in natural cohesive sediment was uniquely investigated under multi-flow event varying sequentially by velocity magnitudes. This flume study differs from others that only used test sediment with commercially available clays for single flow. The objective of this study was to explore the potential differences in scour hole development in natural riverbed sediments subjected to varying flow velocity scenarios, advancing our understanding from existing studies on scour. The study consisted of 18 experimental runs based on: velocity, flow duration, and soil bulk density. Scour hole development progressed initially along the cylinder sides, and maximum depths also occurred at these lateral locations. Scour hole depths were less for higher soil bulk densities (≥1.81 g/cm3) compared with lower densities, and erosion rates were slower. It was observed with all flow sequences that scour depths were similar at the end of each experimental run. However, scour initiation was observed to be time dependent for soils with higher bulk density (1.81–2.04 g/cm3) regardless of flow velocity sequences. The observed time dependency suggests a process feedback with the scour hole development initiated at the cylinder sides, which influence local 3D hydraulics as the scour hole depth progresses. View Full-Text
Keywords: cohesive sediments; riverbed scour; cylindrical bridge piers; multiple flow events; equilibrium scour depth cohesive sediments; riverbed scour; cylindrical bridge piers; multiple flow events; equilibrium scour depth
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MDPI and ACS Style

Mahalder, B.; Schwartz, J.S.; Palomino, A.M.; Zirkle, J. Scour Hole Development in Natural Cohesive Bed Sediment around Cylinder-Shaped Piers Subjected to Varying Sequential Flow Events. Water 2021, 13, 3289. https://doi.org/10.3390/w13223289

AMA Style

Mahalder B, Schwartz JS, Palomino AM, Zirkle J. Scour Hole Development in Natural Cohesive Bed Sediment around Cylinder-Shaped Piers Subjected to Varying Sequential Flow Events. Water. 2021; 13(22):3289. https://doi.org/10.3390/w13223289

Chicago/Turabian Style

Mahalder, Badal, John S. Schwartz, Angelica M. Palomino, and Jon Zirkle. 2021. "Scour Hole Development in Natural Cohesive Bed Sediment around Cylinder-Shaped Piers Subjected to Varying Sequential Flow Events" Water 13, no. 22: 3289. https://doi.org/10.3390/w13223289

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