نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد اصفهان (خوراسگان)، اصفهان، ایران
2 دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی اصفهان (خوراسگان)، اصفهان، ایران
3 دانشکده عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Piano key weirs represent an evolved and novel type of labyrinth weirs, offering a higher water flow coefficient when compared to linear weirs. In this research, a type-C trapezoidal piano key weir with a height of 0.2 meters was utilized, incorporating two jumps with radii of 0.15 and 0.21 meters at the weir exit keys. The findings indicated that the presence of a jump contributes to an increase in maximum scour depth. Furthermore, the presence of a jump causes the maximum scouring depth to occur further away from the weir toe. Increasing the radius of the jumps also results in an augmented maximum scour depth. The length of the maximum scour depth, compared to the weir toe, is approximately 12% greater in weirs with a larger jump radius than those with a smaller radius. On average, the maximum length of the scour depth in relation to the weir toe is 29.4% and 19.5% longer in weirs with jump radii of 0.21 and 0.15 meters, respectively, compared to weirs without jumps. Additionally, the presence of a jump diminishes scouring at the weir toe, with toe scour being approximately 42% less pronounced in weirs with a larger jump height compared to weirs without jumps. The average scour index in weirs with jump radii of 0.21 and 0.15 meters is approximately 2.77% and 0.52% lower, respectively, compared to weirs without jumps. Moreover, an increase in jump radius correlates with a decrease in the water permeability coefficient.
کلیدواژه‌ها [English]
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