چکیده
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In the present study, vertical screens were utilized at downstream of vertical drops to increase
the energy dissipation of subcritical flow. The experiments were carried out using screens
with two different porosity ratios (40% and 50%) and three different distances from the drop
brink (30, 60 and 90 cm). The results reveal that drops equipped with screens increase the
relative downstream depth, the relative pool depth, and the relative energy dissipation
compared with a plain vertical drop. By increasing porosity ratios and the screen distance
from the drop brink, the relative downstream depth and relative energy dissipation increase,
whereas the relative pool depth decreases. Also, by increasing the relative critical depth, the
relative energy dissipation of the vertical drop decreases, whereas the energy dissipation
related to the screens increases. However, increasing the relative critical depth initially
increases and then decreases the performance of the hydraulic jump in terms of total energy
dissipation
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