|
Résumé :
|
Flood control remains a major concern for dam designers and operators. This concern has grown in recent decades as a result of climate change and the development of new methods for extreme flood estimation, which have shown the inadequacy of a significant number of spillways to evacuate increased extreme floods. Consequently, dam operators are seeking solutions that can increase the capacity of existing spillways and provide more efficient spillways for new dams. One possible solution is the remodeling of the existing spillway in non-rectilinear form and the adoption of this type of spillway for new dams. The objective of this work is to optimize the labyrinth spillway, in particular the rectangular plan form. In this framework, standard labyrinth weir shape modifications are aimed to improve the hydraulic performance and to reduce the construction cost. These modifications concern the entrance shape, the basis length and the height of the side walls. During this research, a contribution to the theoretical study of the labyrinth weir efficiency is proposed. Two new practical relationships have been developed: the first one is developed to evaluate the labyrinth efficiency. The second one is proposed to facilitate the preliminary design of this type of weir.
|
