Heliu debris flow induced by typhoon soudelor: Failure mechanism and numerical simulation

Ching Fang Lee, Hsien Ter Chou, Ting Chi Tsao, Chih Hao Hsu, Chih Hsuan Huang, Wei Syuan Liao

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Typhoon Soudelor brought abundant rainfall in northern Taiwan on August 8, 2015. The rainfall caused a shallow landslide which was transformed instantly into a debris flow disaster in the Heliu catchment. We integrate remote sensing, rainfall analysis, micro-topography interpretation, lineament of tree fall, field investigation, a UAV survey, and RAMMS simulation to explore the failure mechanism and flow dynamics of this rainfall-induced debris flow. The high resolution shading relief map depicts the landforms of both the old deep-seated landslide and the ancient debris-flow fan. In this study, different numerical scenarios are performed by RAMMS to analyze the possible influence area via adopting the back-analysis approach. In comparison with the post-disaster landform model, the bestfit parameters for Heliu debris flow were also obtained. In addition, verification of dynamic images demonstrates that the maximum flow velocities for the event and deposition height on the debris-flow fan are about 14.3 m/s and 1-5 m, respectively.

Original languageEnglish
Pages (from-to)171-184
Number of pages14
JournalJournal of Chinese Soil and Water Conservation
Volume47
Issue number4
StatePublished - 1 Dec 2016

Keywords

  • Debris flow
  • Debris slide
  • Lineament of trees fall
  • RAMMS
  • Typhoon Soudelor

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