Reducing Scour around Semi-Elliptical Bridge Abutments: Application of Roughness Elements

Author:

Rezaie Afsaneh1,Afzalimehr Hossein1,Sohrabi Sina1,Nazari-Sharabian Mohammad2ORCID,Karakouzian Moses3ORCID,Ahmadi Reza1

Affiliation:

1. Department of Civil Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

2. Department of Mathematics, Engineering, and Computer Science, West Virginia State University, Institute, WV 25112, USA

3. Department of Civil and Environmental Engineering and Construction, University of Nevada Las Vegas, Las Vegas, NV 89154, USA

Abstract

Bridge abutments in river channels induce local scour. Recent research indicates that introducing roughness elements on the surface of the bridge abutments can influence the flow pattern around the abutment, reducing the intensity of eddies and diverting the flow away from the abutment. The roughness elements protruding from the abutment surface, with specific thickness, protrusion, and spacing, influence the scour process by enhancing turbulence. This study investigates the impact of roughness elements and their spacing on clear water scour at bridge abutments. The results reveal a noteworthy reduction in scour depth as the spacing between roughness elements decreases and their thickness increases on the abutment surface. Furthermore, an increase in the roughness spacing to roughness protrusion ratio (s/p) leads to an amplified scour depth. Additionally, the presence of roughness on the abutment surface alters the slope characteristics of the scour hole in response to changes in flow depth. In particular, the absence of roughness exhibits an increased slope as flow depth increases, while the presence of roughness results in a reduced slope across all three flow depths examined. Notably, the maximum slope and depth of the scour hole under the influence of roughness elements occurs at angles of 50 to 70 degrees. Also, the slope and depth of the scour hole decrease to a minimum value at specific roughness dimensions (s = 0.17 L and p = 0.17 L).

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Mechanical Engineering,Condensed Matter Physics

Reference28 articles.

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5. Chiew, Y.M. (1984). Local Scour at Bridge Piers. [Ph.D. Thesis, University of Auckland].

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