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| Titel |
Simulation of the erosion process of landslide dams due to overtopping considering variations in soil erodibility along depth |
| VerfasserIn |
D. S. Chang, L. M. Zhang |
| 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 Science ; 10, no. 4 ; Nr. 10, no. 4 (2010-04-29), S.933-946 |
| Datensatznummer |
250008096
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| Publikation (Nr.) |
 copernicus.org/nhess-10-933-2010.pdf |
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| Zusammenfassung |
| A landslide dam typically comprises freshly deposited heterogeneous,
unconsolidated or poorly consolidated earth materials and is vulnerable to
overtopping breaching. A physically-based breach model is presented to
simulate the breaching process of such landslide dams. The new model can
predict the breach evolution, the erosion rate, and the outflow hydrograph. A
spreadsheet is developed to numerically implement the model. The erosion
processes of Tangjiashan Landslide Dam and Xiaogangjian Landslide Dam induced
by the 2008 Wenchuan earthquake are analyzed using the new model. The
erodibility of the two landslide dams varies significantly along depth. The
predicted key breaching parameters (i.e., final breach size, failure time,
and peak outflow rate) considering the variations in the soil erodibility
along depth agree well with the observed values. Further sensitivity analysis
indicates that the soil erodibility affects the breaching process of a
landslide dam significantly. Higher soil erodibility will lead to a larger
breach, a shorter failure time and a larger peak outflow rate. The erosion
rate of the breach channel in the depth direction decreases with increasing
erosion resistance of the landslide deposits. In the two case studies, the
key breaching parameters cannot be properly predicted if constant soil
erodibility parameters along depth are assumed. |
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