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A formation model for debris flows in the Chenyulan River Watershed, Taiwan

Author

Listed:
  • Bin Yu
  • Li Li
  • Yufu Wu
  • Shengming Chu

Abstract

Many debris flows were triggered in the Chenyulan River Watershed in Taiwan in a rainstorm caused by the Typhoon Toraji. There are 117 gullies with a significant steep topography in the catchment. During this Typhoon, debris flows were initiated in 43 of these gullies, while in 34 gullies, it was not certain whether they have occurred. High-intensity short-duration rainfall was the main triggering factor for these gully type debris flows which are probably entrained by a “fire hose” mechanism. Previous research identified 47 factors related to topography, geology, and hydrology, which may play a role in the formation of gully type debris flows. For a better understanding of the probability of the formation of debris flows, it is proposed to represent the factors related to topography, geology, and hydrology by one single factor. In addition to the existing topographic and geological factor, a normalized critical rainfall factor is suggested with an effective cumulative precipitation and a maximum hourly rainfall intensity. In this paper, a formation model for debris flows is proposed, which combines these topographic, geological, and hydraulic factors. A relationship of these factors with a triggering threshold is proposed. The model produces a good assessment of the probability of occurrence of debris flows in the study area. The model may be used for the prediction of debris flows in other areas because it is mostly based on the initiation mechanisms and not only on the statistical analyses of a unique variety of local factors. The research provides a new and exciting way to study the occurrence of debris flows initiated by a “fire hose” mechanism. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Bin Yu & Li Li & Yufu Wu & Shengming Chu, 2013. "A formation model for debris flows in the Chenyulan River Watershed, Taiwan," 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. 68(2), pages 745-762, September.
  • Handle: RePEc:spr:nathaz:v:68:y:2013:i:2:p:745-762
    DOI: 10.1007/s11069-013-0646-6
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    References listed on IDEAS

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    1. George Lu & Long Chiu & David Wong, 2007. "Vulnerability assessment of rainfall-induced debris flows in Taiwan," 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. 43(2), pages 223-244, November.
    2. Tung-Chiung Chang, 2007. "Risk degree of debris flow applying neural networks," 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. 42(1), pages 209-224, July.
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    Citations

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    Cited by:

    1. Th. Asch & C. Tang & D. Alkema & J. Zhu & W. Zhou, 2014. "An integrated model to assess critical rainfall thresholds for run-out distances of 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. 70(1), pages 299-311, January.

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