Irrigation Sciences and Engineering

Irrigation Sciences and Engineering

Investigation of turbulence flow structure and sediment entrainment around a round-nosed rectangular pier using a downstream bed sill

Document Type : Research Paper

Authors
Ehsan Sanadgol 1
Manouchehr Heidarpour 2
Reza Mohammadpour Ghalati 3
1 Ph.D. Student of Civil Engineering Department, Estahban Branch, Islamic Azad University, Estahban, Iran.
2 Professor, Department of Water Science and Engineering, Faculty of Agriculture, Isfahan University of Technology,
3 Assistant Professor, Civil Engineering Department, Estahban Branch, Islamic Azad University, Estahban, Iran.
10.22055/jise.2020.32989.1916
Abstract
Estimation of scour at bridge piers has always been a challenging problem to the hydraulic engineers and has attracted the interest of many researchers. Bridges are always degradation due to various factors, but many researchers have identified the main cause of bridge failure as local scour around bridge piers (Lagasse and Richardson, 2001; Dey and Barbhuiya, 2004; Khaple et al., 2017b). Although there are numerous studies of local scour, however, the coherent structures in turbulent flow around the bridge pier still remain unknown. Most studies on scour have focused on techniques to control and reduce the local scouring (e.g. Izadinia and Heidarpour, 2012). Since the sediment transport process is very complicated due to the interaction of many parameters, therefore, studies have been carried out to determine the turbulent flow structure, but not enough. Lu and Willmarth (1973) introduced the quadrant analysis for studying the structure of the bursting phenomenon. In fact, the bursting phenomenon consists of four different events outward interaction, ejection, inward interaction, and sweep. Izadinia et al. (2013) and Izadinia and Heidarpour (2019) by measured velocity profiles around the circular pier and using quadrant analysis, they investigated the flow structure around the pier. Given the importance of the flow structure and in particular the bursting events around the bridge piers, it can be stated that still their characteristics have not been investigated in detail. Therefore, since the quadrant analysis is a powerful tool to recognize the structure of the bursting phenomenon and consequently to find the susceptible regions for sediment entrainment and deposition, this technique is considered in present study to investigate the coherent structure of turbulent flow in scouring process around the bridge pier. In addition, since previous studies have focused more on investigating the flow structure at the circular bridge pier, therefore, the main objective of this study is to investigate the flow structure around round-nosed rectangular with bed sill.
Keywords
Bridge pier
Bed sill
Scour
Bursting events
Quadrant analysis
Subjects
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Irrigation Sciences and Engineering
Volume 48, Issue 2
Summer 2025
Pages 1-19

  • Receive Date 05 May 2020
  • Revise Date 24 December 2020
  • Accept Date 27 December 2020
  • Publish Date 23 August 2025