Landslides and Rainfall Characteristics Analysis in Taipei City during the Typhoon Nari Event |
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| Authors: | Fan-Chieh Yu Tien-Chien Chen Meei-Ling Lin Chien-Yuan Chen Wen-Hai Yu |
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| Institution: | (1) Department of Soil and Water Conservation, National Chung Hsing University, 250 Guoguang Road, 402 Taichung, Taiwan, ROC;(2) Department of Soil and Water Conservation, National Pingtung University of Science and Technology, 1 Hseuh Fu Road, Neipu, Pingtung, 912, Taiwan, ROC;(3) Department of Civil Engineering, National Taiwan University, Sec. 4, 1 Roosevelt Road, 106 Taipei, Taiwan, ROC;(4) National Science and Technology Center for Disaster Reduction, Sec. 2, 3F, 106, Ho Ping E. Road, 106 Taipei, Taiwan, ROC |
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| Abstract: | The severe Typhoon Nari ended on September 15, 2001 with a high-intensity and high-accumulation storm that dumped up to 1249 mm
of rain in Taipei City, Taiwan. The high-intensity and high-accumulation event caused flooding and triggered more than 400
soils slips and debris flows and large, complex landslides. Detailed information on 63 events, including rainfall, initiation
time, and magnitude of landslides were documented and analyzed to identify the landslides and rainfall characteristic in Taipei
City during Typhoon Nari. The result reveals that slump, slide, and debris flow events are associated with the situation of
high-intensity or high-accumulation rainfall. The rainfall intensity-duration condition resulted in smaller magnitude and
shallow failures. Medium to massive landslide were mainly related to the high-accumulation rainfall. A landslide regionalization
process based on rainfall, geomorphologic and geologic characteristics is proposed. Results of the proposed process show good
agreement with landslide events observed in the Taipei City during Typhoon Nari. |
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| Keywords: | landslides rainfall intensity rainfall accumulation GIS regionalization Taipei City Taiwan |
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