Characteristics analysis for the flash flood-induced debris flows |
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| Authors: | Chen Chien-Yuan Chen Lien-Kuang Yu Fan-Chieh Lin Sheng-Chi Lin Yu-Ching Lee Chou-Lung Wang Yu-Ting Cheung Kei-Wai |
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| Institution: | (1) Department of Civil & Water Resources Engineering, National Chiayi University, Chiayi City, 60004, Taiwan;(2) National Science and Technology Center for Disaster Reduction (NCDR), 9F. No. 200, Sec. 3, Beisin Rd, Sindian City, Taipei County, 23143, Taiwan;(3) National Chung Hsing University, Taichung, 104, Taiwan |
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| Abstract: | Typhoon Haitang caused landfall on Taiwan during 15–21 July, 2005 and brought 2,279 mm of maximum cumulative rain with a maximum
intensity of 176 mm/h. The torrential rain was mainly distributed from the central mountain range to southern Taiwan and triggered
222 slopeland-related hazards. Among the hazard events, there were 17 debris flows, 157 cases of traffic cut-off, three large-magnitude
deep-seated landslides, and 10 villages isolated in the off-track mountainous areas. The debris flows initiated in southern
Taiwan were associated with torrential rain, short channel length (<2 km), and small basin area (<3 km2), and were speculated to be induced by flash flood. These flash flood-induced debris flows have a higher rainfall intensity-duration
threshold for initiation than in other areas. The deep-seated landslides, isolated villages due to traffic cut-off in off-track
mountain areas, and recurrent hazards in areas affected by the ML 7.6 Chi-Chi earthquake in 1999 are characteristics of slopeland hazards in Taiwan in recent years. One of the most urgently
needed mitigation strategies in response to slopeland hazards is the plan for enhancing self-rescue disaster resistance in
off-track mountainous villages in Taiwan. |
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| Keywords: | Debris flow Landslide Flash flood Hazard mitigation |
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