TY - JOUR ID - 83719 TI - Experimental study of two phase Air-water Flow Parameters in Hydraulic Jumps with vegetated Rough Bed JO - Iranian journal of Ecohydrology JA - IJE LA - en SN - 2423-6098 AU - Adeli, Atefeh AU - Ahadiyan, Javad AU - Ghomeshi, Mehdi AU - Fathi Moghadam, Manoochehr AD - Faculty of Water and Environmental Engineering,, Department of Hydraulic Structures, Shahid Chamran University of Ahvaz. AD - Associate Professor. Faculty of Water and Environmental Engineering, Department of Hydraulic Structures, Shahid Chamran University of Ahvaz AD - Professor. Faculty of Water and Environmental Engineering, Department of Hydraulic Structures, Shahid Chamran University of Ahvaz Y1 - 2021 PY - 2021 VL - 8 IS - 3 SP - 763 EP - 775 KW - "Air–water two-phase flow" KW - "Hydraulic jump" KW - "dual-tip conductivity probe" KW - "rigid vegetated bed" DO - 10.22059/ije.2021.327831.1528 N2 - 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. UR - https://ije.ut.ac.ir/article_83719.html L1 - https://ije.ut.ac.ir/article_83719_ccb07ee944566b2632c7843bb768e369.pdf ER -