الفهرس Only 14 pages are availabe for public view
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Abstract
The stilling basins are commonly used to dissipate the energy and protect the
down stream floor from erosion. Several researchers studied the efficiency
of the stilling basins and how to improve their efficiency. The aim of the
present work is to improve the roughened stilling basin using T-shape
roughness instead of rectangular shape roughness and then design this new
shape of roughness. In order to design the new stilling basin an experimental
work was carried out. Five different intensities and eight different lengths
were tested under four gate openings and six different flows for each gate
opening. The experiments were carried out in the hydraulics laboratory of
the Faculty of Engineering Ain Shams University. As a result of the present
work the best intensity ranged between 7.2 to 8.8 % and the best roughness
length as Lr/Y1=16 where Lr = roughness length and Y1= initial depth. The
T-shape roughness save materials and reduce the jump length compared to
the rectangular shape of roughness.