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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50547

Title: Transient modeling of regional rainfall-triggered shallow landslides
Authors: Cheng-Yu Ku
Chih-Yu Liu
Yan Su
Jing-En Xiao
Chi-Chao Huang
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: Pore water pressure
Unsaturated soil
Richards equation
Shallow landslide
Date: 2017-08
Issue Date: 2018-10-15T03:13:58Z
Publisher: Environmental Earth Sciences
Abstract: Abstract: This study investigates the transient modeling of regional rainfall-triggered shallow landslides in unsaturated soil using the Richards equation. To model shallow landslides within a distributed regional-scale framework, infinite slope stability analysis coupled with the hydrological model with consideration of the fluctuation of time-dependent pore water pressure and the soil–water characteristic curve proposed by van Genuchten was developed. The validity of the proposed model is established through several test problems by comparing the numerical results with the analytical solutions. A new procedure to set up wide-range shallow landslide analysis and to integrate regional distribution variations for input data such as geology, groundwater level, hydrogeological characteristics, and rainfall intensity and duration was presented. The results obtained demonstrate that the computed distribution of the safety factor is consistent with the distribution of actual landslides. In addition, the fluctuation of pore water pressure in unsaturated soil dominates the stability of landslides during typhoons accompanied by heavy rainfall. The findings observed in this study are a fundamental contribution to environmental effects for landslides in areas with higher occurrence and vulnerability to extreme precipitation.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50547
Appears in Collections:[河海工程學系] 期刊論文

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