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Information Journal Paper

Title

Experimental study of two phase Air-water Flow Parameters in Hydraulic Jumps with vegetated Rough Bed

Pages

  763-775

Abstract

 Hydraulic jumping is a complex three-dimensional phenomenon which is frequently observed in open channel flow such as rivers. The hydraulic resistance of vegetation plays a major role in the hydrodynamics of rivers with extensive natural floodplains. Vegetation penetrates the flow field and creates resistant force and, consequently, energy dissipation. In this study, the effect of vegetation density and height on flow in a Hydraulic jump and parameters related to two phase Air-water flow are examined using cylindrical elements made of galvanized iron with a homogeneous diameter of 7 mm as vegetation. Thus, neither the effects of plant diversity nor flexibility have been considered. For this purpose, four forms of rough bed were used in two modes of staggered and collocated grid roughness with two heights of 1. 5 and 3 cm, and the results were compared with data on smooth bed as a reference. Experiments were conducted in a horizontal rectangular flume with a width of 30 cm, in the range of upstream Froude numbers between 1. 5 Fr1 5. 5. Air-water flow measurements were conducted with a dual-tip conductivity probe, which was designed, developed and calibrated in this research. The results of this study showed that the presence of vegetation increases aeration by increasing the void fraction in a jump roller. And on the other hand, increasing the resistant force and shear stress in the bed reduces conjugate depths and roller length. This increase and decrease depends on the upstream Froude numbers, height and density of vegetation.

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    APA: Copy

    Adeli, Atefeh, AHADIYAN, JAVAD, GHOMESHI, MEHDI, & FATHI MOGHADAM, MANOOCHEHR. (2021). Experimental study of two phase Air-water Flow Parameters in Hydraulic Jumps with vegetated Rough Bed. IRANIAN JOURNAL OF ECOHYDROLOGY, 8(3 ), 763-775. SID. https://sid.ir/paper/1059235/en

    Vancouver: Copy

    Adeli Atefeh, AHADIYAN JAVAD, GHOMESHI MEHDI, FATHI MOGHADAM MANOOCHEHR. Experimental study of two phase Air-water Flow Parameters in Hydraulic Jumps with vegetated Rough Bed. IRANIAN JOURNAL OF ECOHYDROLOGY[Internet]. 2021;8(3 ):763-775. Available from: https://sid.ir/paper/1059235/en

    IEEE: Copy

    Atefeh Adeli, JAVAD AHADIYAN, MEHDI GHOMESHI, and MANOOCHEHR FATHI MOGHADAM, “Experimental study of two phase Air-water Flow Parameters in Hydraulic Jumps with vegetated Rough Bed,” IRANIAN JOURNAL OF ECOHYDROLOGY, vol. 8, no. 3 , pp. 763–775, 2021, [Online]. Available: https://sid.ir/paper/1059235/en

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