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| Titel |
Analysis of changes in post-seismic landslide distribution and its effect on building reconstruction |
| VerfasserIn |
W. T. Yang, M. Wang, N. Kerle, C. J. van Westen, L. Y. Liu, P. J. Shi |
| 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 ; 15, no. 4 ; Nr. 15, no. 4 (2015-04-10), S.817-825 |
| Datensatznummer |
250119421
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| Publikation (Nr.) |
 copernicus.org/nhess-15-817-2015.pdf |
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| Zusammenfassung |
| Six years after the devastating Ms 8.0 Wenchuan earthquake, new landslides,
debris flows, and flash floods still occur frequently in the
earthquake-stricken regions. This shows that the geological hazards that occur
after a major earthquake in a mountainous environment can be a long-term
threat. However, post-earthquake reconstruction and relocation of local
residents often neglect this evolving threat, and its interaction with
existing and rebuilt houses has not been well studied. Here we show that the
evolving mountain environment, including the changed geographic distribution
of new landslides and the continuously uplifting riverbed, creates emerging
risks for existing and rebuilt houses. We use spatial analysis of landslide
debris and the location of houses from high-resolution images and field
survey in the study area and find that new landslides and the houses
rebuilt after the Wenchuan earthquake have a similar trend of moving to
lower elevations, gentler slopes, and closer to rivers. This study confirms
that the persistent downward movement of landslide debris has rapidly filled
up riverbeds over the past 6 years. The elevated riverbeds make the study area
extremely susceptible to flash floods, creating further risks to newly
rebuilt houses that are closer to the river. We highlight the often
neglected dynamic process that involves changes in the natural environment
and man-made constructions and their interaction. This dynamic process
requires long-term monitoring and adaptive management of mountainous regions
after major earthquakes that can fully consider the sophisticated evolving
risks caused by the changing environment, exposure, and vulnerability in the
region. |
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