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| Titel |
Numerical modeling of the lateral widening of levee breach by overtopping in a flume with 180° bend |
| VerfasserIn |
S.-T. Dou, D.-W. Wang, M.-H. Yu, Y.-J. Liang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 1 ; Nr. 14, no. 1 (2014-01-03), S.11-20 |
| Datensatznummer |
250118227
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| Publikation (Nr.) |
 copernicus.org/nhess-14-11-2014.pdf |
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| Zusammenfassung |
| Floods caused by levee breaching pose disastrous risks to the lower reaches
and the flood flow zones of rivers. Thus, a comprehensive assessment of flow
and sediment transport during floods must be performed to mitigate flood
disasters. Given that the flow state becomes relatively more complex and the
range of the submerged area becomes more extensive after a levee breach, this
paper established a flow and sediment model by using two-dimensional shallow
water equations (SWEs) to explore the breach development process and the flow
and sediment transport in a curved bed after a levee breach due to
overtopping. A three-element weighted essentially non-oscillatory Roe scheme
was adopted for the discretization of SWEs. In addition, a non-equilibrium
total-load sediment transport model was established to simulate the scour
depth development process of the breach. A stable equilibrium of the breach
was established based on flow shear force and soil shear strength. The
lateral widening of the breach was simulated by the scouring-collapse lateral
widening mode. These simulations, together with the levee breach experiment
conducted in the laboratory, demonstrate the validity of the flow and
sediment transport process established in this paper. The effects of water
head in and out of the watercourse, the flow rate, the levee sediment
grading, and other variables during levee breaching were also analyzed. The
mathematical model calculation provided a number of physical quantities, such
as flow rate and flow state at the breach, that are difficult to measure by
using the current laboratory facilities. The results of this research provide
fundamental data for developing measures that can reduce casualties and asset
loss due to floods caused by levee breaching. |
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