TY - JOUR ID - 80755 TI - Experimental Investigation of the Performance of Inclined Gabion Drop Equipped with a Horizontal Screen JO - Iranian Journal of Soil and Water Research JA - IJSWR LA - en SN - 2008-479X AU - Daneshfaraz, Rasoul AU - Majedi Asl, Mahdi AU - Bagherzadeh, Mohammad AD - Professor , Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Iran. AD - Assistant Professor,, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. AD - M.Sc. in Civil Engineering-Hydraulic Structures, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran Y1 - 2021 PY - 2021 VL - 52 IS - 1 SP - 81 EP - 93 KW - energy dissipation KW - Inclined gabion drop KW - Screens KW - Relative wet length KW - Relative Critical Depth DO - 10.22059/ijswr.2020.308412.668705 N2 - One of the important hydraulic issues is to study the effect of additional structures on dissipating the flow energy in overflow structures such as drops. In the present study, using a laboratory model, the effect of simultaneous use of horizontal screen and gabion in the inclined drop structure was investigated and compared with the results of other researchers. The experiments were performed for two heights and three inclined gabion angles, two screen porosity ratios and a flow rate of 150 to 800 liters per minute. The results of all the studied models showed that by increasing the relative critical depth, the relative energy consumption values decrease and the relative downstream depth increases. By increasing angle and height of the slope and decreasing the porosity of the screen for a constant relative critical depth, the relative energy dissipation of the inclined gabion drops equipped with a horizontal screen increases. Increasing the wetted length of horizontal screens causes two-phase flow and air entrance to the used system and consequently the amount of energy dissipation increases. Simultaneous use of gabions in the sloping section and horizontal screens at the edge of the drop has significantly reduced the downstream Froude number so that the downstream Froude number at all three angles and two porosity ratios decreased from range of 4.49-35 to range of 1.31-2.48 compared to the simple inclined slope and from range of 1.48-5.78 to range of 1.31-2.48 as compared to the inclined slope equipped with a horizontal lattice plate. UR - https://ijswr.ut.ac.ir/article_80755.html L1 - https://ijswr.ut.ac.ir/article_80755_51d61f97062cf7245077311da51a81b5.pdf ER -