Modelling of Flood Inundation due to Levee Breaches: Sensitivity of Flood Inundation against Breach Process Parameters
Abstract
:1. Introduction
2. Methodology
2.1. Approach
2.2. Telemac-2D
2.3. The Breach Model Used in This Investigation
2.4. The Levee Breach Case: The 1996 Awash River Levee Breach at Wonji
2.4.1. The Study Area
2.4.2. The 1996 Awash River Levee Breach at Wonji, Ethiopia
3. Model Set Up
3.1. Computational Mesh
3.2. Boundary and Initial Conditions
3.3. Model Calibration and Validation
4. Sensitivity Analysis of the Breach Model Parameters
4.1. Breach Duration
4.2. Breach Start Time (Breach Initiation)
4.3. Final Breach Width
4.4. Final Breach Level
4.5. Breach Location
4.6. Erosion Type
5. Discussion
6. Conclusions
- Flood inundation due to levee breach depends on the final dimensions of the levee breach and the breach location. The final breach dimensions affect the consequence of the levee breach as the amount of water that can flow into the hinterland is the function of the breach dimensions.
- The breach location affects the consequence of the levee breach even if the discharge through the breach is not significantly influenced.
- The process of the levee breaching (breach development) has marginal to no influence on the resulting flood inundation. This is shown, however, for floods lasting over several days. Consequences of levee breaches due to flash floods lasting for short period could be sensitive to the levee breaching processes.
- Accurate and reliable methods for determining the final breach dimensions and breach location are important for a more accurate flood inundation estimation.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Tadesse, Y.B.; Fröhle, P. Modelling of Flood Inundation due to Levee Breaches: Sensitivity of Flood Inundation against Breach Process Parameters. Water 2020, 12, 3566. https://doi.org/10.3390/w12123566
Tadesse YB, Fröhle P. Modelling of Flood Inundation due to Levee Breaches: Sensitivity of Flood Inundation against Breach Process Parameters. Water. 2020; 12(12):3566. https://doi.org/10.3390/w12123566
Chicago/Turabian StyleTadesse, Yohannis Birhanu, and Peter Fröhle. 2020. "Modelling of Flood Inundation due to Levee Breaches: Sensitivity of Flood Inundation against Breach Process Parameters" Water 12, no. 12: 3566. https://doi.org/10.3390/w12123566