الفهرس | Only 14 pages are availabe for public view |
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. |