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Variability of impact of earthquake on debris-flow triggering conditions: case study of Chen-Yu-Lan watershed, Taiwan

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Abstract

This study investigates the variations in the critical conditions for debris-flow occurrence before and after the Chi-Chi earthquake in the Chen-Yu-Lan watershed, Taiwan. Topographical and rainfall parameters such as the gully gradient, drainage area, rainfall intensity, cumulative rainfall, and rainfall duration in the Chen-Yu-Lan watershed were used to analyze the conditions of debris-flow occurrence over the past 25 years. A recovery equation was proposed on the basis of rainfall parameters and used to determine the variations in the critical line of rainfall that trigger debris flow after the earthquake and to evaluate the recovery period required for the rainfall threshold of debris-flow occurrence after the earthquake to return to that before the earthquake in the watershed. The critical line for the runoff parameter versus gully gradient in the watershed was also presented.

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Authors and Affiliations

  1. Department of Environmental and Hazards-Resistant Design, Huafan University, New Taipei City, 22301, Taiwan

    Jinn-Chyi Chen

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  1. Jinn-Chyi Chen
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Correspondence to Jinn-Chyi Chen.

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Chen, JC. Variability of impact of earthquake on debris-flow triggering conditions: case study of Chen-Yu-Lan watershed, Taiwan. Environ Earth Sci 64, 1787–1794 (2011). https://doi.org/10.1007/s12665-011-0981-4

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  • DOI: https://doi.org/10.1007/s12665-011-0981-4

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