Effect of Different Bed Configuration on Flow Resistance under Different Flow Regimes in an Open Channel

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Muhammad Afzal
Muhammad Afzal
σ
Muhammad Yaseen
Muhammad Yaseen
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Khalida Khan
Khalida Khan
α University of Engineering and Technology Lahore University of Engineering and Technology Lahore

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Effect of Different Bed Configuration on Flow Resistance under Different Flow Regimes in an Open Channel

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Abstract

forms on flow resistance for different flow conditions in an open channel. The study was limited to investigate whether the flow resistance increases or decreases. The inter-relationship of flow discharge on the friction factor (f) and their quantitative relationship was also determined. A physical model was constructed in the Model Tray Hall of Centre of Excellence in Water Resource Engineering (CEWRE), University of Engineering & Technology Lahore, Pakistan. The sediment commonly available in rivers of Pakistan was used in the channel as bed load under different scenarios. The sediments as bed load were used having the size ranging from 0.5 to 1.2 mm. The bed-forms were predicted using the Athaullah, Simons, Richardson and Van Rijn’s Approach. Darcy-Weisbach equation was used to compute the friction factor (f). The results showed that the friction factor (f) in clear water decreased with increase of discharge upto 18 liter per second and a plane bed type was formed. For flow of 18 to 25 liter per second, a ripple bed type was formed due to increase in friction factor. For flow rate of 25 to 40 liter per second the friction factor decreased and dune bed type was formed.

References

10 Cites in Article
  1. (1963). Friction Factors in Open Channels: Progress Report of the Task Force on Friction Factors in Open Channels of the Committee on Hydromechanics of the Hydraulics Division.
  2. F Engelund,E Hansen (1967). A monograph on sediment transport in alluvial streams.
  3. F Engelund (1977). Hydraulic resistance of flow over dunes.
  4. P Julien,G Klaassen (1995). Sanddune geometry of large rivers during floods.
  5. D Simons,E Richardson (1963). Forms of Bed Roughness in Alluvial Channels.
  6. Daryl Simons,E Richardson (1966). Resistance to flow in alluvial channels.
  7. D Simons,F Seinturk (1977). Sediment Transport Technology.
  8. Leo Van Rijn (1984). Sediment Transport, Part III: Bed forms and Alluvial Roughness.
  9. Leo Van Rijn,Aart Kroon (1993). Sediment Transport by Currents and Waves.
  10. M Yaseen,M Latif,N Nabi (2011). Effect of suspended sediment on flow resistance for different condition in an open channel.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Muhammad Afzal. 2015. \u201cEffect of Different Bed Configuration on Flow Resistance under Different Flow Regimes in an Open Channel\u201d. Global Journal of Research in Engineering - E: Civil & Structural GJRE-E Volume 15 (GJRE Volume 15 Issue E1): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

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GJRE-E Classification: FOR Code: 090599
Version of record

v1.2

Issue date

March 20, 2015

Language
en
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forms on flow resistance for different flow conditions in an open channel. The study was limited to investigate whether the flow resistance increases or decreases. The inter-relationship of flow discharge on the friction factor (f) and their quantitative relationship was also determined. A physical model was constructed in the Model Tray Hall of Centre of Excellence in Water Resource Engineering (CEWRE), University of Engineering & Technology Lahore, Pakistan. The sediment commonly available in rivers of Pakistan was used in the channel as bed load under different scenarios. The sediments as bed load were used having the size ranging from 0.5 to 1.2 mm. The bed-forms were predicted using the Athaullah, Simons, Richardson and Van Rijn’s Approach. Darcy-Weisbach equation was used to compute the friction factor (f). The results showed that the friction factor (f) in clear water decreased with increase of discharge upto 18 liter per second and a plane bed type was formed. For flow of 18 to 25 liter per second, a ripple bed type was formed due to increase in friction factor. For flow rate of 25 to 40 liter per second the friction factor decreased and dune bed type was formed.

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Effect of Different Bed Configuration on Flow Resistance under Different Flow Regimes in an Open Channel

Muhammad Yaseen
Muhammad Yaseen
Muhammad Afzal
Muhammad Afzal University of Engineering and Technology Lahore
Khalida Khan
Khalida Khan

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