Geomorphic evolution of the Dong-Ao peak landslide, north eastern Taiwan

Ching Fang Lee, Hsien Ter Chou, Lung Wei Wei, Wei Kai Huang, Shu Yeong Chi, Su Chin Chen, Wen Chao Huang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Typhoon Megi coupled with the northeastern monsoon induced an extreme rainfall of 939 mm on the Suao area, Yilan County, in eastern Taiwan on October 21st, 2010, causing the Dong-Ao Peak landslide of 2.1 million m3 along the coastal Su-Hua Section of Highway Route 9. This study adopts a geological survey, rainfall data, satellite images, orthophotos, and high-resolution DEM based on airborne laser scanner surveys to quantify the morphological changes before and after landslide events following major rainfall events since 2010. Rainfall frequency analysis indicates the cumulative precipitation triggering landslide events is greater than the 200-year return period. In addition, both the entrainment effect of debris flow and toe erosion on the down-slope is shown to induce regressive sliding failure at the adjacent roadbed. The results suggest that geological factors such as head-cutting erosion and the concave landform shape the landform evolution of the catchment. The occurrence of landslides also depends on antecedent earthquake events and extreme intense rainfalls.

Original languageEnglish
Pages (from-to)174-183
Number of pages10
JournalJournal of Chinese Soil and Water Conservation
Issue number3
StatePublished - 1 Sep 2014


  • Dong-Ao Peak
  • Large-scale landslide, debris flow
  • Remote sensing interpretation
  • Shear zone


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