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Dam Break Analysis Using HEC-RAS Case Study of Wadi Abu Sheih, Egypt
Research Paper , Page 49-61 (13)
Full Text (1.42 MB)
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Abstract
Although it is a low probability, the collapse of flash flood protection dams in arid areas cause dramatic disasters. Such event is extremely unpredictable, so it is necessary to estimate probable flood characteristics over inhabited areas. Analyses of dam break consider the parameter of dam breach to quantify and route the outflow hydrograph due to dam break. Several dam failure simulation models are used to predict dam failure shape and timing, HECRAS being one of the best known. Three cascade flash flood mitigation dams in upper Egypt were breached in 2014 but the details of the event weren't recorded. In this paper, we investigate the application of HEC-RAS 2D in dam break analysis as an early warning system, emergency action plans, and flood mapping implementation tool. That is a powerful tool to understand the complexity of these events and its consequences. HEC-RAS 2D is used to build a hydrodynamic model for a dam breaching case, its reservoir and the downstream flooding zone. The results include flood extent, dam’s outflow hydrograph, flow depth and velocity over the inundated delta, and arrival time. After completing this work, further studies for other failing scenarios are required to achieve complete understanding of that disaster.
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