Investigation the changes of bed shear stress and flow energy around impermeable and permeable angular barriers and gabion in a movable bed straight channel

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fazli majid; Kahrizi Emad

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Journal Paper

Paper Information

Journal: JOURNAL OF HYDRAULICS Year:2018 | Volume:13 | Issue:3 (133) Page(s): 31-45

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Title

Investigation the changes of bed shear stress and flow energy around impermeable and permeable angular barriers and gabion in a movable bed straight channel

Author(s)

fazli majid | Kahrizi Emad | Issue Writer Certificate

Keywords

Bed shear stressQ1

Kinetic energyQ1

Impermeable barrierQ1

Rod barriersQ1

ScouringQ2

Energy dissipationQ3

Abstract

The presence of barriers in the flow path causes significant changes in the wall shear stress distribution of the channels and rivers. In this research, the distribution of shear stress around permeable and impermeable angular barriers with two arrangement of consecutive and zigzag were experimentally investigated. The experiments were carried out in a rectangular channel with a Froude number of 0. 26 with clear water and a flow velocity ratio to the threshold of the particle motion. The results show that the shear stress distribution of the bed in the Impermeable barrier is higher about 14. 6% of the shear stress in gabion with a porosity of 30%. Also, in the consecutive and zigzag double rod permeable barriers, the shear stress distribution are almost the same. Calculations of Kinetic energy dissipation around angular barriers indicates that in Impermeable barriers, Energy dissipation is about 14% higher than gabions. Also, in permeable barriers with the same opening percentage, Energy dissipation in gabions is about 80% higher than double Rod barriers. These calculations also show that Energy dissipation depends on the geometric arrangement of the rods, as the Energy dissipations of the zigzag bar is 18 percent higher than the consecutive barriers.

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APA: Copy

fazli, majid, & Kahrizi, Emad. (2018). Investigation the changes of bed shear stress and flow energy around impermeable and permeable angular barriers and gabion in a movable bed straight channel. JOURNAL OF HYDRAULICS, 13(3 (133) ), 31-45. SID. https://sid.ir/paper/124214/en

Vancouver: Copy

fazli majid, Kahrizi Emad. Investigation the changes of bed shear stress and flow energy around impermeable and permeable angular barriers and gabion in a movable bed straight channel. JOURNAL OF HYDRAULICS[Internet]. 2018;13(3 (133) ):31-45. Available from: https://sid.ir/paper/124214/en

IEEE: Copy

majid fazli, and Emad Kahrizi, “Investigation the changes of bed shear stress and flow energy around impermeable and permeable angular barriers and gabion in a movable bed straight channel,” JOURNAL OF HYDRAULICS, vol. 13, no. 3 (133) , pp. 31–45, 2018, [Online]. Available: https://sid.ir/paper/124214/en

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