Average velocity of bedload particle in uniform open channel flows

Use of laboratory flume model to define the reach-averaged velocity of a single spherical particle rolling over an ideally closely packed particle bed obtained under different uniform flow conditions. This experiment aims at simulating the bedload particle rolling and saltation in rough open channel...

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Main Author: Tang, Qi.
Other Authors: Cheng Niansheng
Format: Final Year Project
Language:English
Published: 2013
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Online Access:http://hdl.handle.net/10356/53863
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-538632023-03-03T17:23:29Z Average velocity of bedload particle in uniform open channel flows Tang, Qi. Cheng Niansheng School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute DRNTU::Engineering::Environmental engineering::Water supply Use of laboratory flume model to define the reach-averaged velocity of a single spherical particle rolling over an ideally closely packed particle bed obtained under different uniform flow conditions. This experiment aims at simulating the bedload particle rolling and saltation in rough open channels as a function of the following variables: (1) water surface or friction slope Sf, (2) flow depth h, (3) particle size ds, (4) viscosity of the fluid ν, (5) excess specific gravity Δ, and (6) gravitational acceleration g. The designed flume flow specifications has been well controlled and measured, flow was relatively shallow (1.2 < h/ds < 2.0), the Froude number within a wide range (0.7 < Fr < 1.6), friction slope varied (0.005 < Sf < 0.032). This study model may be applicable to a real condition such as rapids over gravel beds at mountain vale. As the result of this project, an fitting empirical solution is offered where Vp ≈ 9.28 u*exp(-0.015/τ*). It is expressed as a function of Shields number τ* (function of Δ, ds, h, g, Sf), could be able to approximate the reach-averaged particle velocity in a rough open channel. A more detailed analysis of force interactions which tend to propel and retard particle in contact-load motion will be discussed. Bachelor of Engineering (Environmental Engineering) 2013-06-10T01:20:56Z 2013-06-10T01:20:56Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/53863 en Nanyang Technological University 46 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water supply
spellingShingle DRNTU::Engineering::Environmental engineering::Water supply
Tang, Qi.
Average velocity of bedload particle in uniform open channel flows
description Use of laboratory flume model to define the reach-averaged velocity of a single spherical particle rolling over an ideally closely packed particle bed obtained under different uniform flow conditions. This experiment aims at simulating the bedload particle rolling and saltation in rough open channels as a function of the following variables: (1) water surface or friction slope Sf, (2) flow depth h, (3) particle size ds, (4) viscosity of the fluid ν, (5) excess specific gravity Δ, and (6) gravitational acceleration g. The designed flume flow specifications has been well controlled and measured, flow was relatively shallow (1.2 < h/ds < 2.0), the Froude number within a wide range (0.7 < Fr < 1.6), friction slope varied (0.005 < Sf < 0.032). This study model may be applicable to a real condition such as rapids over gravel beds at mountain vale. As the result of this project, an fitting empirical solution is offered where Vp ≈ 9.28 u*exp(-0.015/τ*). It is expressed as a function of Shields number τ* (function of Δ, ds, h, g, Sf), could be able to approximate the reach-averaged particle velocity in a rough open channel. A more detailed analysis of force interactions which tend to propel and retard particle in contact-load motion will be discussed.
author2 Cheng Niansheng
author_facet Cheng Niansheng
Tang, Qi.
format Final Year Project
author Tang, Qi.
author_sort Tang, Qi.
title Average velocity of bedload particle in uniform open channel flows
title_short Average velocity of bedload particle in uniform open channel flows
title_full Average velocity of bedload particle in uniform open channel flows
title_fullStr Average velocity of bedload particle in uniform open channel flows
title_full_unstemmed Average velocity of bedload particle in uniform open channel flows
title_sort average velocity of bedload particle in uniform open channel flows
publishDate 2013
url http://hdl.handle.net/10356/53863
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