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Experimental Study of Scour Downstream Piano Key Weir Type C with Changing Height of Weir Width of Keys and Apron Solid | ||
| Al-Rafidain Engineering Journal (AREJ) | ||
| Article 21, Volume 27, Issue 1, 2022, Pages 193-204 PDF (2.29 M) | ||
| Document Type: Review Paper | ||
| DOI: 10.33899/rengj.2021.130402.1101 | ||
| Authors | ||
| Arwa Abdul-razaaq Jamal* ; Khalid Ysseen Tahaa; Ghania Abd Al-Majeed Hayawi | ||
| Dams and Water Resources Engineering Department, Collage of Engineering, University of Mosul | ||
| Abstract | ||
| To find out mechanism scour downstream weirs and study effect changing ratio width of keys Wi/Wo , length of Apron solid and studying effect of changing the lateral length B on depth and length of the maximum scour by passing different discharge and using homogeneous soil. A laboratory study was conducted to measure depth of scour downstream piano key weir type C and to show effect height weir, ratio width of keys and length of apron solid. Three heights of weir (25,30,35) cm , three ratios of width keys (1,1.25,1.5) and two distances were used For apron solid (90,120) by passing four different discharges (15, 22, 29, 36)) l/s in experiments, where number of models used nine models, on which (72) experiments were conducted. The depth of scour for all experiments that by reducing height weir , maintaining ratio width of the keys and discharge, scour decreases for all experiments. The results also showed that by increasing length of apron solid by 33.33%, the scour depth will be decreased by a rate ranging between (2.17-28.75)%. and that by increasing the percentage of the width keys from ratio (1) ) to ratio (1.5) scour depth decreases by a rate ranging between (13.04-47.38%) for all experiments, decreasing height of weirs from 35 cm to 25 cm, the percentage decrease scour depth ranged (20-40.2)%. To arrive at a positional equation in terms of variables and a coefficient of determination of R2 = 0.958 . | ||
| Keywords | ||
| scour; piano key weir type C; Apron Solid; uniform soil | ||
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