The monitoring and flow dynamics of gravelly debris flows

Hsien Ter Chou, Ching Fang Lee, Chih Hsuan Huang, Yu Long Chang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In this study, rainfall-induced debris flows in the Houyenshan gravelly gullies, Miaoli, and the corresponding rainfall threshold conditions are explored. Based on the in-situ rain gauge data from the monitoring system and field surveys during the period from 2006 to 2012, we found the debris flow tends to occur when the total rainfall exceeds 57.5 mm and the subsequent rainfall intensity is higher than 3 mm/hr. Field survey and terrestrial LiDAR measurement indicate the talus deposition in the source areas and outbursts of landslide dams on the gully bed are the dominant factors inducing debris flows. Finally, HHT spectrum analysis of geophone signals for stony debris flows depicts the peak frequencies within the range of 10-50 Hz. The temporal intensity distribution of geophone signals are determined by both the magnitude of debris flows and travel distance with respect to the monitoring station.

Original languageEnglish
Pages (from-to)144-157
Number of pages14
JournalJournal of Chinese Soil and Water Conservation
Issue number2
StatePublished - Jun 2013


  • Critical rainfall line
  • Dam break
  • Debris flows
  • Gravelly gullies
  • Houyenshan


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