Post-earthquake denudation and its impacts on ancient civilizations in the Chengdu Longmenshan region, China

Chen, N, Li, J, Liu, L, YANG, C and Liu, M 2018, 'Post-earthquake denudation and its impacts on ancient civilizations in the Chengdu Longmenshan region, China', Geomorphology, vol. 309, pp. 51-59.


Document type: Journal Article
Collection: Journal Articles

Title Post-earthquake denudation and its impacts on ancient civilizations in the Chengdu Longmenshan region, China
Author(s) Chen, N
Li, J
Liu, L
YANG, C
Liu, M
Year 2018
Journal name Geomorphology
Volume number 309
Start page 51
End page 59
Total pages 9
Publisher Elsevier
Abstract This study characterizes significant changes in denudation and disasters in mountainous areas induced in the humid Chengdu Longmenshan region by the Wenchuan Earthquake in 2008. A study focusing on the Longxi-Baisha River Basin was conducted to investigate the amount of denudation triggered by specific flash flood and debris flow events in 20092014. The following results were obtained through a comparison of pre-seismic regional denudation rates and denudation characteristics of other seismically active mountain regions. (1) Regional denudation processes occurred in a wave-like process of initial increase then decline, with a peak exhibiting a hyperbolic attenuation trend. This trend indicates that the denudation rate in the Chengdu Longmenshan region is expected to return to the pre-seismic rate of 0.3 mm a?1 after 81 years. In 22 years after the earthquake (Year 2030), debris flow disasters are expected to be rare. (2) Disasters increased significantly in the Chengdu Longmenshan region after the Wenchuan earthquake, with an average of 29.5 people missing or dead per year (22 times greater than the pre-earthquake rate) and average economic losses of 192 million Yuan per year (1.6 times greater than the pre-earthquake rate). (3) The denudation process was jointly controlled by the quantities of loose solid material and precipitation after the Wenchuan earthquake. The amount of loose solid material influenced the extent of denudation, while vegetation coverage rates and soil consolidation determined the overall denudation trend in the region, and changes in precipitation led to denudation fluctuations. (4) The results can be used to analyze the relationship between the potential flash flood-debris flow disasters after earthquakes in the ancient Shu kingdom and changes in historical social settlements. The results can also be used to predict denudation processes and disaster risks from earthquakes in humid mountainous regions around the world, such as the southern sl
Subject Atmospheric Sciences not elsewhere classified
Earthquake Engineering
Keyword(s) Debris flow
Denudation
Flash flood
Humid mountainous regions
Migration
DOI - identifier 10.1016/j.geomorph.2018.02.007
Copyright notice © 2017 Elsevier B.V.
ISSN 0169-555X
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