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Journal: |
Other journals 2013 No.2
clicks:857 |
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Title:
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Author:
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ZHANG Shuai; ZHANG Li-Min; CHEN Hong-Xin; YUAN Quan; PAN Hua |
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Adress: |
Department of Civil and Environmental Engineering,The Hong Kong University of Science and Technology |
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Abstract:
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A large number of debris flows
occurred in the Wenchuan earthquake zone after the 12 May 2008 earthquake.The
risks posed by these debris flows were rather high.An appropriate model is
required to predict the possible runout distance and impacted area.This paper
describes a study on the runout characteristics of the debris flows that
occurred in the Wenchuan earthquake zone over the past four years.A total of 120
debris flows are analyzed.Separate multivariate regression models are
established for the runout distances of hill-slope debris flows and channelized
debris flows.The control variables include type of debris flow,debris flow
volume,and elevation difference.Comparison of the debris flows occurring before
and after the earthquake shows that the runout distance increased after the
earthquake due to sufficient material supply and increased mobility of the
source materials.In addition,the runout distances of annual debris flow events
in 2008,2010 and 2011 are analyzed and compared.There is a tendency that the
runout distance decreases over time due to the decreasing source material volume
and possible changes of debris flow type.Comparison between the debris flows in
the earthquake zone and the debris flows in Swiss Alps,Canada,Austria,and Japan
shows that the former have a smaller mobility. |
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