A Case Study On The Occurrence Of Regional
Debris Flow Hazard In Central Taiwan
Author(s)
C.-C. Lee, C.-Y. Ku, S.-M. Hsu, Y.-L. Chang & S.-Y. Chi
Abstract
Large-scale debris flow hazards occurred in Ta-Chia River watershed during
typhoons that passed through Taiwan from 2001 to 2005 without forewarning.
Especially, the Minduli typhoon event in 2004 hit Taiwan which caused severe
property damage and inflicted heavy casualties. Though landslide-induced debris
flows present a hazard that is being increasingly recognized, such a large-scale
debris flow hazard in Ta-Chia River watershed still appears to be particular.
Until now, few detailed case studies of regional debris flow hazards in Ta-Chia
River watershed have been presented in the literature. In this paper, we present a
detailed study on the occurrence of regional debris flow hazard in Ta-Chia River
watershed and reveal the trigger mechanism of the landslide and debris flow. To
explore the coupling between the Chi-Chi earthquake and sequential regional
debris flow hazards in Ta-Chia River watershed, the remote sensing data, Digital
Elevation Model (DEM), historical landslides, and rainfall data were adopted in
this study. For characterizing temporal aspects of the hazard, aerial photographs
and satellite images of multi-temporal stages were used. Spatial distribution of
landslides and rainfall characteristics were also discussed. Our findings indicate
that the regional debris flow hazards were mainly caused by the huge amount of
sparsely deposited materials from landslides triggered by Chi-Chi earthquake.
Rapidly increasing water pressure caused by typhoon events provided a powerful
force that moved the sparsely deposited materials into gullies and then triggered
the debris flow movement. A strong coupling between the spatial distribution of
rainfalls and the occurrence of regional debris flows is also addressed.
Keywords: debris flow, landslide, rainfall intensity, Chi-Chi earthquake, Taiwan.
Keywords
debris flow, landslide, rainfall intensity, Chi-Chi earthquake, Taiwan.
Related Book
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