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| Titel |
Analyzing the behaviors of the landslide triggered by Rainfall Event in the Western Foothills in the Northern Taiwan using Digital Elevation Models |
| VerfasserIn |
C.-H. Tseng, J.-C. Hu, Y.-C. Chan, J.-F. Lee, J.-Y. Wei |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024812
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| Zusammenfassung |
| During August 23 to 24, 2004, a typhoon named AERE hit the Northern Taiwan and caused
great damage to the people and the natural environment. The accumulated amount of rainfalls
in the western part of Taiwan exceeded 1,000 mm during the hitting of AERE. The disaster
took place concentrated in the Wufong Township, Hshinchu County part of the Western
Foothills in the northern Taiwan. This study is focused on one of the numerous landslides due
to the typhoon AERE which is located at Huayuan Tribe in the Wufong Township. We
compared and analyzed two Digital Elevation Models (DEM) of the study area generated by
two pairs of aerial photographs taken on July 22, 2003 and October 17, 2004. From the
two DEMs, the resolution is 2 m per pixel, we observed fine characteristics of the
topography around the study area and the morphology of the landslide. These two DEMs
reveal that the landslide event developed on the western slope of a ridge, and the
slope angle is about 50Ë .By means of comparing and analyzing the two DEMs, we
obtained that the slope angle of the landslide is about 50Ë parallel to the slope of the
topography. In addition, the total area of the landslide is about 10,000 m2, and the total
volume of the landslide material is calculated about 140,000 m3. The landslide
material is siltstone and shale with high water content and lower cementation. After
the heavy precipitation due to the typhoon AERE, the landslide occurred as the
type of the arc-shaped failure which can be observed from the DEM. By means of
observing and analyzing the high resolution DEM from the aerial photographs, we can
understand the morphology, behaviors and mechanisms of landslide events in detail. |
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