The effect of air bubble screen on scouring reduction in a mild 90 degrees bend

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Maleki Prai; AHADIYAN JAVAD; KASHEFIPOUR SEYED MAHMOOD; FATHIMOGHADAM MANOCHEHR; Schleiss Aanton

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Journal: JOURNAL OF HYDRAULICS Year:2019 | Volume:14 | Issue:1 (141) Page(s): 91-105

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Title

The effect of air bubble screen on scouring reduction in a mild 90 degrees bend

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Keywords

Rivers bendQ1

ScourQ2

Air-bubble screenQ1

Secondary flowQ3

Flow patternQ2

Abstract

An Air-bubble screen is an innovative technique for riverbank protection along the bends which improve the navigation conditions in the alluvial rivers. In this research, the effects of this structure on a 90° mild and long bend on the bed morphology and Flow pattern have been investigated. To this end, the experiments were carried out with three angles 0, 45, 90 degree and four Froude numbers of 0. 37, 0. 41, 0. 45, 0. 47 combined with three air discharge. Experiments performed in a mild bend using clearwater showed that the bubble screen was able to redistribute the velocity patterns and bed morphology in the bend. In addition, the results showed that maximum bend Scouring is reduced about 47% and occurs further away from the outer bank and high velocity zone shifted toward the center of the channel. The results showed that the maximum and minimum Scour depths in outer bank with 0 and 90 degrees angles respectively. Also, by increase of air discharge ratio the maximum Scour depth was decreased.

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APA: Copy

Maleki, Prai, AHADIYAN, JAVAD, KASHEFIPOUR, SEYED MAHMOOD, FATHIMOGHADAM, MANOCHEHR, & Schleiss, Aanton. (2019). The effect of air bubble screen on scouring reduction in a mild 90 degrees bend. JOURNAL OF HYDRAULICS, 14(1 (141) ), 91-105. SID. https://sid.ir/paper/124223/en

Vancouver: Copy

Maleki Prai, AHADIYAN JAVAD, KASHEFIPOUR SEYED MAHMOOD, FATHIMOGHADAM MANOCHEHR, Schleiss Aanton. The effect of air bubble screen on scouring reduction in a mild 90 degrees bend. JOURNAL OF HYDRAULICS[Internet]. 2019;14(1 (141) ):91-105. Available from: https://sid.ir/paper/124223/en

IEEE: Copy

Prai Maleki, JAVAD AHADIYAN, SEYED MAHMOOD KASHEFIPOUR, MANOCHEHR FATHIMOGHADAM, and Aanton Schleiss, “The effect of air bubble screen on scouring reduction in a mild 90 degrees bend,” JOURNAL OF HYDRAULICS, vol. 14, no. 1 (141) , pp. 91–105, 2019, [Online]. Available: https://sid.ir/paper/124223/en

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