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Arabian Journal for Science and Engineering

, Volume 44, Issue 5, pp 4183–4199 | Cite as

Hydromorphological Numerical Model of the Local Scour Process Around Bridge Piers

  • H. OmaraEmail author
  • S. M. Elsayed
  • G. M. Abdeelaal
  • H. F. Abd-Elhamid
  • A. Tawfik
Research Article - Civil Engineering
  • 70 Downloads

Abstract

The aim of this study was to assess the simulation and prediction of scour processes, both hydrodynamically and morphologically, around vertical and inclined piers. A new version of FLOW-3D v. 11.2, including three sediment transport equations, was extensively used for estimating the scour around the pier. The results of the model in terms of water surface, flow velocity, bed shear stress and scour depth were effectively compared with several sets of the experimental and numerical data in the literature. The model provided an accurate estimation of water surface, flow velocity and bed shear stress. However, the results for the vertical velocity upstream of the pier were underestimated. The predictive capabilities of the model were mainly dependent on the pier shape and inclined direction. The downflow, stream-wise velocity, shear stress and local scour depth were significantly reduced at the inclination angle of the circular pier downstream. However, they were nearly equal to those of an inclined perpendicular circular pier. This study strongly demonstrates that a 3D hydromorphological model can be effectively used to predict the scour depth around piers.

Keywords

Scouring depth FLOW-3D Hydromorphological model Sediment transport Vertical/inclined piers 

List of symbols

D

Pier diameter

\(d_\mathrm{s}\)

Equilibrium scour depth

\(D_{50}\)

Mean sediment size

\(g_{i}\)

Gravitational acceleration in ith direction

k

von Karman constant

P

Total pressure

\(P_{o}\)

Upstream undisturbed static pressure

\(S_{o}\)

Longitudinal slope of flume

t

Time

U

Average flow velocity

\(u_\mathrm{p}\)

Mean flow velocity at point p

\(u_{*}\)

Shear velocity

\(V_{x}\)

Local flow velocity in x-direction

\(V_{y}\)

Local flow velocity in y-direction

\(V_{z}\)

Local flow velocity in z-direction

x

Distance in x-direction

h

Flow depth

y

Distance in y-direction

\(Z+\)

Wall unit distance

z

Distance in z-direction

\(z_\mathrm{p}\)

Distance from point p to wall

q

Volume fraction of qth phase in control volume

\(\Delta B\)

Roughness function

\(\delta \)

Kronecker delta function

\(pu_{i}\,u_j \)

Turbulence stresses

Equ.

Equilibrium scour depth

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Notes

Acknowledgements

The first author is supported by a scholarship from the Mission Department, Ministry of Higher Education, Egypt, which is gratefully acknowledged. Second, I am thankful to Egypt-Japan University of Science and Technology (E-JUST) and Japan International Cooperation Agency (JICA) for offering the tools and equipment needed for the research work.

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • H. Omara
    • 1
    Email author
  • S. M. Elsayed
    • 2
  • G. M. Abdeelaal
    • 3
  • H. F. Abd-Elhamid
    • 3
  • A. Tawfik
    • 1
    • 4
  1. 1.Environmental Engineering DepartmentEgypt - Japan University of Science and Technology (E-Just)New Borg El Arab CityEgypt
  2. 2.Head Numerical Modeling DepartmentThe Hydraulics Research InstituteAshmounEgypt
  3. 3.Water and Water Structures, Engineering Department, Faculty of engineeringZigazigEgypt
  4. 4.Water Pollution Research DepartmentNational Research CentreDokkiEgypt

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