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Characteristics analysis for the flash flood-induced debris flows

Author

Listed:
  • Chen Chien-Yuan
  • Chen Lien-Kuang
  • Yu Fan-Chieh
  • Lin Sheng-Chi
  • Lin Yu-Ching
  • Lee Chou-Lung
  • Wang Yu-Ting
  • Cheung Kei-Wai

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 km 2 ), 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 M L 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. Copyright Springer Science+Business Media B.V. 2008

Suggested Citation

  • Chen Chien-Yuan & Chen Lien-Kuang & Yu Fan-Chieh & Lin Sheng-Chi & Lin Yu-Ching & Lee Chou-Lung & Wang Yu-Ting & Cheung Kei-Wai, 2008. "Characteristics analysis for the flash flood-induced debris flows," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 47(2), pages 245-261, November.
  • Handle: RePEc:spr:nathaz:v:47:y:2008:i:2:p:245-261
    DOI: 10.1007/s11069-008-9217-7
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    References listed on IDEAS

    as
    1. Chien-Yuan Chen & Lee-Yao Lin & Fan-Chieh Yu & Ching-Sheng Lee & Chun-Chieh Tseng & An-Hsiang Wang & Kei-Wai Cheung, 2007. "Improving debris flow monitoring in Taiwan by using high-resolution rainfall products from QPESUMS," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 40(2), pages 447-461, February.
    2. Fan-Chieh Yu & Tien-Chien Chen & Meei-Ling Lin & Chien-Yuan Chen & Wen-Hai Yu, 2006. "Landslides and Rainfall Characteristics Analysis in Taipei City during the Typhoon Nari Event," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 37(1), pages 153-167, February.
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