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Debris flow assessment from rainfall infiltration induced landslide

Hsu, Yu-Charn
; 
Liu, Ko-Fei
; 
Shu, Hung-Ming
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Date
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2019
Date Submitted
Keywords
TRIGRS
 debris-2D
 estimate unstable mass
 the hazard zone
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Seventh International Conference on Debris-Flow Hazards Mitigation - Proceedings
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05-20_Hsu.pdf
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https://hdl.handle.net/11124/173153
 http://dx.doi.org/10.25676/11124/173153
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Abstract
In the study, debris flows induced by landslides are studied through physical models. TRIGRS and DEBRIS-2D models are integrated for simulation of rainfall infiltration induced shallow landslide and the subsequent debris flows. TRIGRS is used to estimate unstable mass on the hillslope and provide the initial volume for debris flow simulation, and DEBRIS-2D is applied to simulate mass motion and assess the hazard zone mapping. The method is applied to Daniao tribe’s sediment disaster during Typhoon Morakot in Taiwan. The simulated final deposition zone and the disaster area in the real event are almost identical. All the geophysical parameters are obtained through official values and rheological parameters are obtained by in situ measurements.
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