Knickpoint recession rates for 10 years after the Chi-Chi earthquake, central Taiwan

Yuichi S. Hayakawa, Nobuhisa Matsuta, Akira Maekado, Yukinori Matsuk

Research output: Contribution to journalArticle

Abstract

Recession rates of four waterfalls formed by the surface deformation of the Chelungpu Fault at the time of Chi-Chi Earthquake on September 21, 1999 in central Taiwan were measured in the field and assessed with an empirical model of waterfall erosion. The model represents the balance between the erosive force of streams versus bedrock resistance with relevant environment parameters of discharge (drainage area and precipitation), waterfall form and bedrock strength. The Recession rates of three waterfalls increased from the first 6 years to following 4 years. This increase in the recession rates basically corresponds to the changed in environmental factors including precipitation increase and waterfall width narrowing. The recession rate of another waterfall decreased, but this can be explained by artificial modification of riverbed. The recession rates are very high comparing with waterfall in other places, probably due to large amount of hard gravels transported on the weak bedrock from the upstream areas.

Original languageEnglish
Pages (from-to)21-36
Number of pages16
JournalChikei/Transactions, Japanese Geomorphological Union
Volume34
Issue number1
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Active fault
  • Bedrock erosion
  • Erosion rate
  • Knickpoint
  • Taiwan
  • Waterfall

ASJC Scopus subject areas

  • Earth-Surface Processes

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