n Journal of Emerging Trends in Engineering and Applied Sciences - Numerical simulation on breach evolution process of a river levee by overtopping

Volume 6, Issue 1
  • ISSN : 2141-7016
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Bangladesh experiences levee breach flood more or less every year in different magnitudes due to the geographical position and obscured natural phenomenon. Levee breach causes serious disaster due to inundation and sediment deposition on the floodplain. The most of the previous research works are focused on the levee breach expansion process and some of them are only investigated sedimentation process in the floodplain. But, the levee breach phenomenon appears not only at levee but also from the river to floodplain, and thus physical experiments are difficult while a simulation approach has not been well developed. Therefore, RIC-Nays a two-dimensional (2D) model for flood flow and morphology are utilized in this study upon confirmation through another numerical study to analyze the evolution process of a river levee. As for simulation scheme, schematic model area is considered with main channel, levee and floodplain. These three components are treated simultaneously in the simulation model and the flow parameters are selected in conformity with an approximation of the Jamuna river right bank levee and Sirajganj district of Bangladesh. Levee breach is considered to initiate in the middle of the levee with crest opening. According to the simulated results, both in the temporal growth of breaching section and the loss of levee cross section is increased with time. Near the breach area the velocity and sediment deposition are the higher. Inundation depth is increased with time as well as increases of the initial breach lengths in the levee. This research would be better and might be realistic understanding of the breach evolution process of a river levee if in a real-life situation with three-dimensional analysis.

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