Movement of deep-seated rainfall-induced landslide at Hsiaolin Village during Typhoon Morakot

This study analyzes the mechanism of the landslide event at Hsiaolin Village during Typhoon Morakot in 2009. This landslide event resulted in 400 deaths. The extremely high intensity and accumulative rainfall events may cause large-scale and complex landslide disasters. To study and understand a lan...

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Bibliographic Details
Published in:Landslides 2013-04, Vol.10 (2), p.191-202
Main Authors: Kuo, Yu-Shu, Tsai, Yuan-Jung, Chen, Yu-Shiu, Shieh, Chjeng-Lun, Miyamoto, Kuniaki, Itoh, Takahiro
Format: Article
Language:English
Subjects:
Agriculture
Civil Engineering
Dams
Disasters
Earth and Environmental Science
Earth Sciences
Field tests
Geography
Landslides
Landslides & mudslides
Mathematical models
Natural Hazards
Original Paper
Rain
Rainfall
Typhoons
Water content
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Summary:This study analyzes the mechanism of the landslide event at Hsiaolin Village during Typhoon Morakot in 2009. This landslide event resulted in 400 deaths. The extremely high intensity and accumulative rainfall events may cause large-scale and complex landslide disasters. To study and understand a landslide event, a combination of field investigations and numerical models is used. The landslide area is determined by comparing topographic information from before and after the event. Physiographic parameters are determined from field investigations. These parameters are applied to a numerical model to simulate the landslide process. Due to the high intensity of the rainfall event, 1,675 mm during the 80 h before the landslide event, the water content of soil was rapidly increased causing a landslide to occur. According to the survivors, the total duration of the landslide run out was less than 3 min. Simulation results indicated that the total duration was about 150 s. After the landslide occurrence, the landslide mass separated into two parts by a spur at EL 590 in about 30 to 50 s. One part passed the spur in about 30 to 60 s. One part inundated the Hsiaolin Village and the other deposited at a local river channel and formed a landslide dam. The landslide dam had height between 50 and 60 m and length between 800 and 900 m. The simulation result shows that the proposed model can be used to evaluate the potential areas of landslides induced by extremely high intensity rainfall events.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-012-0315-y