Rainfall conditions for the initiation of debris flows during typhoon Morakot in the Chen-Yu-Lan watershed in Central Taiwan

Jinn Chyi Chen, Wen Shun Huang, Chyan-Deng Jan, Yuan Fan Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)

Abstract

In the August of 2009, Typhoon Morakot brought heavy rainfall and caused several landslides, floods and debris flows in central and southern Taiwan. This work presents the critical rainfall conditions for the initiation of debris flows in the Chen-Yu-Lan watershed of central Taiwan during the action of Typhoon Morakot, where had many severe debris-flows events during the actions of Typhoon Herb in 1996 and Typhoon Toraji in 2001. Thirty-seven debris flow events induced by the heavy rainfalls brought by Typhoon Morakot in the Chen-Yu-Lan watershed were identified by the examination of aerial photographs and field investigations. The rainfall conditions, including the rainfall intensity, the cumulative rainfall, the rainfall intensity-duration curve and the return period of the rainfall, for debris-flows initiation were analyzed and compared with the rainfall conditions of historical debris-flows events in the watershed. The average rainfall intensity that triggered abundant debris flows in the watershed were determined and the relation between the density of debris-flows occurrence and the rainfall characteristics were also presented.

Original languageEnglish
Title of host publication5th International Conference on Debris-Flow Hazard Mitigation
Subtitle of host publicationMechanics, Prediction, and Assessment
Pages31-36
Number of pages6
DOIs
Publication statusPublished - 2011
Event5th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment - Padua, Italy
Duration: 2011 Jun 142011 Jun 17

Other

Other5th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment
CountryItaly
CityPadua
Period11-06-1411-06-17

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth-Surface Processes
  • Water Science and Technology

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