الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
The present work is intended to study the dissipation of energy of water flowing over inclined surfaces. A dispersive trampolining flow dissipator is developed, it characterizes by simplicity in construction and maintenance, high performance and independence on the tailwater depth. The dissipator consists of a board followed by a sill, both are fixed to the inclined surface The board has a trapezoidal shape fixed horizontally to the inclined surface through its shorter width the board disperses the flow then trampolines a part of the flow to strike the other part, reflected by the sill, in the air Factors affecting the dissipated flow were investigated such as ; position of the board, dimensions of the board ( width and length) and the fixation angle of the sill The parameters involved in the problem were tested experimentally using an ogee spillway model installed in an experimental flume The length of disturbance in tailwater was measured. Velocity distribution was also measured at different sections along a sufficient length of the tailwater reach.
Results showed that the developed dissipator possesses a great efficiency, since reduces the length of stilling basin to a great extent compared with the length of perfect jump formed in case without dissipator In addition, the suggested dissipator may cause a great reduction in the flow velocity on the downstream bed. The suggested trampolining flow dissipator is characterized by simplicity in construction and operation, low construction costs, no running costs, independence on tailwater depth, and above all, higher efficiency in dissipating excessive flow energy falling over dams, chutes and weir spillways.