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CFD-Based Model for Estimating the River Bed Morphological Characteristics near Cylindrical Bridge Piers Due to Debris Accumulation

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Abstract

The scour and flow field patterns with accumulation of debris around bridge piers are completely different due to the reduction of flow area and the increase in depth average velocity. Accordingly, the risks of bridge piers failure are increased due to the evolution of scour depth. This paper aims to analyse the effect of rectangular debris accumulation around single and dual cylindrical piers on river bed morphology in three dimensional simulation under clear water conditions. An experimental and numerical investigations were conducted to implement computational fluid dynamic (CFD) models that reveal the influence debris accumulation on the characteristics of scour hole and the increase in depth average velocity. The large eddy simulation model (LES) was coupled with three morphological models (Meyer-Peter, and Muller; Van Rijn model, and Nielsen) to assess the performance of simulation and produce efficient CFD morphological models. It was found that coupling of LES turbulence model and Nielsen morphological model yield best agreement with measured scour depth and scour hole characteristics according to the indication of statistical analysis, while the under prediction was noted for other models. As compared with temporal scour development and scour hole morphology of experiments of this study, good agreement was achieved for implemented CFD morphological models for single pier and dual piers with debris accumulation for (6.2 and 16.6% obstructed area to the flow area) respectively. According to the indications of this study, the increase in depth average velocity due to debris accumulation can be ranged from 26 to 44% and from 17 to 41% during the first ten minutes of accumulation around single and dual piers respectively. More consideration should be taken to mitigate bridge piers from debris accumulation.

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Authors and Affiliations

  1. Projects and Construction Department, University of Kerbala, 56001, Kerbala, Iraq

    Aysar Tuama Al-Awadi

  2. Civil Engineering Department, University of Technology, 19006, Baghdad, Iraq

    Mahmoud Saleh Al-Khafaji

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  1. Aysar Tuama Al-Awadi
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  2. Mahmoud Saleh Al-Khafaji
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Correspondence to Aysar Tuama Al-Awadi or Mahmoud Saleh Al-Khafaji.

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Al-Awadi, A., Al-Khafaji, M. CFD-Based Model for Estimating the River Bed Morphological Characteristics near Cylindrical Bridge Piers Due to Debris Accumulation. Water Resour 48, 763–773 (2021). https://doi.org/10.1134/S0097807821050031

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