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106504

Effect of Free Surface, Froude and Reynolds Numbers on the Protection Length and Turbulence in the Compound Transitions through Bridges.

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Irrigation and Hydraulic Engineering

Abstract

An experimental study was carried out to investigate the effect of free surface, Froude and Reynolds numbers on the protection length and turbulence through compound transitions using Laser Doppler, in a rectangular channel. Measurements of turbulence are carried out along the compound transition, at different contraction ratios, at different bed slopes. Vertical transition in the bed were also changed. From the results, the protection length increases with the increase of the incoming Froude number, and increases with the increase of the relative height, while it increases with the increase of the contraction ratio. The steep slope has a major effect on the protection length. Free surface Hs a unique role in governing the turbulence in open channel flows. Within and downstream of the transition, the turbulence occurs primarily in the wall region. Within the transition, flow trends towards the critical state (Fr approaches close to 1) with a rise in the turbulence intensities in the free surface and the wall region which may be attributed to the flow tending towards critical state. At small values of Froude number Fr ≤ 0.22, the effect of Froude number on turbulence intensities and the free surface waves negligible.

DOI

10.21608/bfemu.2020.106504

Keywords

Turbulence intensities, Laser Doppler, Protection length, Free surface, Relative height, Contraction ratio, Bottom slope, Froude Number

Authors

First Name

Mahmoud

Last Name

Attia

MiddleName

I.

Affiliation

Researcher at Civil Engineering - Faculty of Engineering - Hail University, Saudi

Email

-

City

-

Orcid

-

First Name

Abdullah

Last Name

Alhomidan

MiddleName

-

Affiliation

Researcher at Civil Engineering - Faculty of Engineering - Hail University, Saudi

Email

-

City

-

Orcid

-

Volume

38

Article Issue

3

Related Issue

16051

Issue Date

2013-09-01

Receive Date

2013-08-15

Publish Date

2020-08-08

Page Start

1

Page End

20

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 38_Issue 3_Pages 1-20.pdf

PDF . 857.0kB

Link

https://bfemu.journals.ekb.eg/article_106504.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=106504

Order

5

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Effect of Free Surface, Froude and Reynolds Numbers on the Protection Length and Turbulence in the Compound Transitions through Bridges.

Details

Type

Article

Created At

22 Jan 2023