Modeling and Risk Analysis of Dam-Break Flooding in a Semi-Arid Montane Watershed: A Case Study of the Yabous Dam, Northeastern Algeria

The risk related to embankment dam breaches needs be evaluated in order prepare emergency action plans. physical and hydrodynamic parameters of the flood wave generated from failure event correspond various breach parameters, such as width, slope, formation time. This study aimed simulate scenario Yabous (northeast Algeria) analyze its influence on areas (urban natural environments) downstream dam. simulation was completed using sensitivity analysis method assess impact flooding break scenario. propagation associated with simulated one-dimensional HEC-RAS hydraulic model. applied a three (slope, time) five sites selected showed that maximum flow recorded at level 8768 m3/s, which gradually attenuated along river course reach 1972.7 m3/s about 8.5 km established map illustrated zones threatened by triggered due extreme rainfall events. flow, height, width revealed positive similar changes for increases adjustments (±25% ±50%) slope sites. However, time significant trends changed opposite direction compared width. Meanwhile, hydrograph did not significantly In present study, 1-D modeling demonstrated effectiveness simulating waves highlighted hydrographical pattern parameters.