Numerical simulation of dam failur and flood mapping in order to plan a rapid response (Case Study: Orumiyeh Shahrchay Dam)

Besides the Remarkable benefits of dams, dam failure is considered as a very high accident risks that its investigation is very important in academic reseraches, government planning and investment at downstream of dams. In Current study, importance of failur problem, mechanism and reasones of dam failure are introduced and the risks analyzing based on the age and type of dam has been investigated firstly and then presented the methods of analyzing the unsteady currents governning equations using numerical models. For this purpose, the output hydrographs from the shaharchi dam site have been computed by breach model and under fictitious dam break scenarios (overtopping) and then the nummerical model of HEC-RAS has been developed to simulate the dam failur problem using powerful processing systems. Then, the obtained results imposed to the Geographic Information System (GIS) and the flood maps due to the dam failur resulted from overtopping phenomenon which is known as the main reason of breach and failur of earth dams has been presented. Finally the flood plaines in downstream regions has been specified.