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| Titel |
Efficient dam break flood simulation methods for developing a preliminary evacuation plan after the Wenchuan Earthquake |
| VerfasserIn |
Y. Li, J. H. Gong, J. Zhu, L. Ye, Y. Q. Song, Y. J. Yue |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-11), S.97-106 |
| Datensatznummer |
250010408
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| Publikation (Nr.) |
 copernicus.org/nhess-12-97-2012.pdf |
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| Zusammenfassung |
| The Xiaojiaqiao barrier lake, which was the second largest barrier lake
formed by the Wenchuan Earthquake had seriously threatened the lives and
property of the population downstream. The lake was finally dredged
successfully on 7 June 2008. Because of the limited time available to
conduct an inundation potential analysis and make an evacuation plan,
barrier lake information extraction and real-time dam break flood simulation
should be carried out quickly, integrating remote sensing and geographic
information system (GIS) techniques with hydrologic/hydraulic analysis. In
this paper, a technical framework and several key techniques for this real-time
preliminary evacuation planning are introduced. An object-oriented method
was used to extract hydrological information on the barrier lake from
unmanned aerial vehicle (UAV) remote sensing images. The real-time flood
routine was calculated by using shallow-water equations, which were solved
by means of a finite volume scheme on multiblock structured grids. The
results of the hydraulic computations are visualized and analyzed in a 3-D
geographic information system for inundation potential analysis, and an
emergency response plan is made. The results show that if either a
full-break or a half-break situation had occurred for the Chapinghe barrier
lake on 19 May 2008, then the Xiaoba Town region and the Sangzao Town
region would have been affected, but the downstream towns would have been
less influenced. Preliminary evacuation plans under different dam break
situations can be effectively made using these methods. |
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