Comparison of the entrainment rate of debris flows in distinctive triggering conditions |
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| Authors: | Chao Ma Yu-Jie Wang Cui Du |
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| Institution: | 1.Key Laboratory of State Forestry Administration on Soil and Water Conservation,Beijing Forestry University,Beijing,China;2.School of civil engineering,Henan University of Science and Technology,Luoyang,China |
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| Abstract: | Debris flows can be extremely destructive because they can increase in magnitude via progressive entrainment. In this paper, a total of 18 landslide-type debris flows and 268 channelized debris flows in Wenchuan earthquake and Taiwan region, as well as other regions were collected to analyze the entrainment rate of debris flows in each triggering condition. Results show that there is a power relationship between volume of initial triggered mass and final deposited debris for landslide type debris flow. The debris flows during 2008 and 2013 in Wenchuan earthquake-region have smaller entrainment rate than that from 2001 t0 2009 in Taiwan. The entrainment rate of debris flow events from 2001 to 2009 in Taiwan shows a decaying tendency as elapsed time. Comparison of the entrainment rate in the two earthquake-hit regions with other regions proves that entrainment rate has a close relation with major sediment availability and secondary rainstorm conditions. |
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