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102461

Scour Downstream Sudden Expansion Stilling Basin.

Article

Last updated: 22 Jan 2023

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Subjects

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Tags

Irrigation and Hydraulic Engineering

Abstract

Local scour due to free hydraulic jump downstream hydraulic structures may cause damage or complete failure of these structures, so controlling of this phenomenon is very important. The main goal of this study is to reduce the characteristics of a scour hole downstream sudden expansion stilling basin. An experimental study was conducted to study the effect of expansion ratio and position of the sill. Ninety experimental runs were carried out considering the wide range of Froude numbers ranging from 3.42 to 8.67. Five values of the expansion ratio (e = 2.73, 1.92, 1.76, 1.50 and 1.25) and four values of the relative position of lateral single sill (Lx/LB = 0.20, 0.30, 0.40 and 0.50) were investigated. The dimensional analysis was employed to drive expressions correlating the different variables affecting the scour phenomena. It was found that, the flow patterns in most of the cases were a symmetrical and the resulting scour and deposition were also a symmetrical. The relative scour depth, the relative scour length and the relative energy loss, increase by increasing the initial Froude number and vice versa. The expansion ratio (e = 1.50) gives the minimum values of scour dimensions. The best location of the sill for reducing the scour dimensions at 0.30LB from the gate opening. Prediction equations were developed using the multiple linear regression (MLR) to model the relative scour depth Ds/y1 and the relative scour length Ls/y1.

DOI

10.21608/bfemu.2020.102461

Keywords

Local Scour, Hydraulic jump, Stilling Basins, Sudden Expansion, Lateral Single Sill

Authors

First Name

Gamal

Last Name

Abdel-Aal

MiddleName

M.

Affiliation

Professor of Hydraulics, Water & Water Str. Eng. Dept., Faculty of Engineering, Zagazig University, Zagazig, Egypt.

Email

-

City

-

Orcid

-

First Name

Maha

Last Name

Fahmy

MiddleName

R.

Affiliation

Associate Professor, Water & Water Str. Eng. Dept., Faculty of Engineering, Zagazig University, Zagazig, Egypt.

Email

-

City

-

Orcid

-

First Name

Amany

Last Name

Habib

MiddleName

A.

Affiliation

Associate Professor, Water & Water Str. Eng. Dept., Faculty of Engineering, Zagazig University, Zagazig, Egypt.

Email

-

City

-

Orcid

-

First Name

Mohamed

Last Name

Elbagoury

MiddleName

G.

Affiliation

Demonstrator, Water & Water Str. Eng. Dept., Faculty of Engineering, Zagazig University, Zagazig, Egypt.

Email

mohamed_elbagoury2011@yahoo.com

City

-

Orcid

-

Volume

40

Article Issue

4

Related Issue

15416

Issue Date

2015-12-01

Receive Date

2015-11-30

Publish Date

2020-07-12

Page Start

39

Page End

49

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 40_Issue 4_Pages 39-49.pdf

PDF . 385.7kB

Link

https://bfemu.journals.ekb.eg/article_102461.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=102461

Order

24

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

-

Details

Type

Article

Created At

22 Jan 2023