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Evolutionary history of post-fire debris flows in Ren’e Yong valley in Sichuan Province of China
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Wang, Yan, Hu, Xiewen, Wu, Lijun, Ma, Guotao, Yang, Ying and Jing, Tao (2022) Evolutionary history of post-fire debris flows in Ren’e Yong valley in Sichuan Province of China. Landslides, 19 . pp. 1479-1490. doi:10.1007/s10346-022-01867-x ISSN 1612-510X.
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Official URL: http://dx.doi.org/10.1007/s10346-022-01867-x
Abstract
Post-fire debris flows have attracted considerable research attention because of their unique characteristics associated with forest fire. Most studies focus on debris flows that occur in the early post-fire years, the understanding of long-term debris-flow risk in burned areas was poor due to lack of evolutionary evidences that derive from field investigations. Through a tracking investigation of seven debris flow events with total seventeen debris flows during the six post-fire years in the burned area in Sichuan province of China, this study analyzed the evolutionary characteristics of post-fire debris flow. The results indicate that the frequency of debris flow events was the highest (five events per year) in the first post-fire year, which then decreased to twice in the following 5 years. Moreover, triggering and antecedent rainfall of these debris flow events increased over time. The material erosion in the initiation processes of debris flow followed the time sequence from runoff-initiated erosion to bank slide erosion to multi-stage bank slide and shallow landslide erosion. Burn severity correlated weakly to bank slides despite that it was directly proportional to runoff-initiated erosion. The particle size of debris-flow deposition gradually increased over time. More than 50% of the multi-stage landslides were undergoing deformation processes until the sixth post-fire year, acting as the potential source material for subsequent debris flows. Finally, a conceptual model with three material erosion steps and two consumptions was proposed to describe the evolution characteristics of post-fire debris flows. The results may provide scientific basis for the long-term debris-flow risk evaluation and the design of protection program in a recently burned area.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | Landslides | ||||||||
Publisher: | Springer | ||||||||
ISSN: | 1612-510X | ||||||||
Official Date: | June 2022 | ||||||||
Dates: |
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Volume: | 19 | ||||||||
Page Range: | pp. 1479-1490 | ||||||||
DOI: | 10.1007/s10346-022-01867-x | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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