Dam Break Modeling for Large Earth and Rock-fill Dams
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 6
Abstract
Dam break analysis plays a very important role in the risk assessment of dams. Large dams pose significantly higher risks to the people and property downstream of the dam as compared to smaller dams. So the flooding risk due to the possible failure of large dams is more crucial. In this study, dam break modeling for very large dams has been focused. For this purpose, Mangla dam, located on Jhelum river in Pakistan, has been taken into consideration. With a height of about 125 m (after raising), Mangla dam is one of the largest earth and rock fill dams in the world. The Erosion based overtopping failure of Mangla dam with raised conditions has been analyzed by using MIKE 11 dam break module. The parametric approach has been used to estimate the breach geometry and simulate the breach growth as a linear process in order to determine the breach outflows. Different cases of dam breach have been considered for dam break simulations. The failure outflow hydrographs have been computed for different breach cases. Moreover, the time to failure and the breach erosion rate have also been determined for the considered breach cases. The maximum outflow for the worst case of dam failure is about 160,000 m3/s which is about 2.5 times the maximum design flood for Mangla dam. This study would be useful for the dam break analysis and the risk assessment of existing & planned dams in Pakistan as well as in other parts of the world.
Authors and Affiliations
Saqib Ehsan - Walter Marx
Keywords
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