Poro-mechanical coupling influences on potential for rainfall-induced shallow landslides in unsaturated soils

Wu, L. Z.; Selvadurai, A. P. S.; Zhang, Li Min; Huang, Runqiu; Huang, Jingsong

doi:10.1016/j.advwatres.2016.10.020

Cited by 56 publications

(21 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering that these raininduced slope failures are shallow seated, the thickness of the failure mass is small compared to the large plan dimensions of these slopes. Therefore, an infinite slope model for two-layer soil slopes is a reasonable option to evaluate the factor of safety (F s ) (Wu et al, 2016). Following Chen and Zhang (2014), the search for the minimum F s goes from the ground surface to the wetting front where the volumetric water content changes significantly.…”

Section: Initiation Of Debris Flows From Slope Failuresmentioning

confidence: 99%

EDDA 2.0: integrated simulation of debris flow initiation and dynamics considering two initiation mechanisms

et al. 2018

View full text Add to dashboard Cite

Abstract. Climate change is resulting in more frequent rainstorms and more rain-induced debris flows in mountainous areas. The prediction of likely hazard zones is important for debris flow risk assessment and management. Existing numerical methods for debris flow analysis often require the input of hydrographs at prescribed initiation locations, ignoring the initiation process and leading to large uncertainties in debris flow initiation locations, times, and volumes when applied to regional debris flow analysis. The evolution of the flowing mixture in time and space is also barely addressed. This paper presents a new integrated numerical model, EDDA 2.0, to simulate the whole process of debris flow initiation, motion, entrainment, deposition, and property changes. Two physical initiation mechanisms are modelled: transformation from slope failures and surface erosion. Three numerical tests and field application to a catastrophic debris flow event are conducted to verify the model components and evaluate the model performance. The results indicate that the integrated model is capable of simulating the initiation and subsequent flowing process of rain-induced debris flows, as well as the physical evolution of the flowing mixture. The integrated model provides a powerful tool for analysing multi-hazard processes, hazard interactions, and regional debris flow risk assessment in the future.

show abstract

Section: Initiation Of Debris Flows From Slope Failuresmentioning

confidence: 99%

EDDA 2.0: integrated simulation of debris flow initiation and dynamics considering two initiation mechanisms

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Considering that these rain-induced 211 slope failures are shallow-seated: the thickness of the failure mass is small compared to the 212 large plan dimensions of these slopes. Therefore, an infinite slope model for two-layer soil 213 slopes is a reasonable option to evaluate the factor of safety (F s ) (Wu et al, 2016). Following 214…”

Section: Rainfall Infiltration and Convolution 188mentioning

confidence: 99%

EDDA 2.0: integrated simulation of debris flow initiation and dynamics, considering two initiation mechanisms

Shen¹,

Zhang²,

Chen³

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. Climate change results in more frequent rainstorms and more rain-induced debris flows in mountainous areas. The prediction of likely hazard zones is important for debris flow risk assessment and management. Existing numerical methods for debris flow analysis often require the input of hydrographs at prescribed initiation locations, ignoring the initiation process and leading to large uncertainties in debris flow initiation locations, times and volumes when applied to regional debris flow analysis. The evolution of the flowing mixture in time and space is hardly addressed either. This paper presents a new integrated numerical model, EDDA 2.0, to simulate the whole process of debris-flow initiation, motion, entrainment, deposition and property changes. Two physical initiation mechanisms are modeled: transformation from slope failures and surface erosion. Three numerical tests and field application to a catastrophic debris flow event are conducted to verify the model components and evaluate the model performance. The results indicate that the integrated model is capable of simulating the initiation and subsequent flowing process of rain-induced debris flows, as well as the physical evolution of the flowing mixture. The integrated model provides a powerful tool for analyzing multi-hazard processes, hazard interactions and regional debris-flow risk assessment in the future.

show abstract

“…Consequently, shallow landslides may often occur within the vadose zone under unsaturated soil conditions [5][6][7]. The prediction of flow in transient conditions is important in engineering practice while considering the stability of unsaturated soil slopes [8][9][10][11][12] or poromechanical coupling influence for rainfall-induced shallow landslides in unsaturated soils [13,14].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Transient Flow in Unsaturated Geomaterials for Rainfall-Induced Landslides Using a Novel Spacetime Collocation Method

Liu

et al. 2018

Geofluids

View full text Add to dashboard Cite

The modeling of transient flow in unsaturated soils for rainfall-induced landslides using a novel spacetime collocation method is presented. A numerical solution obtained in the spacetime coordinate system is approximated by superpositioning Trefftz basis functions satisfying the linearized Richards equation for collocation points on the spacetime domain boundary. The Gardner exponential model is adopted to derive the linearized Richards equation to describe the soil-water characteristic curve in unsaturated soils. To deal with the rainfall-induced landslides, the infinite slope stability analysis coupled with the proposed meshless method with the consideration of the fluctuation of time-dependent matric suction is developed. The proposed method is validated for several test problems. Application examples of transient modeling of flow for rainfall-induced landslides in homogenous unsaturated soils are also conducted. Numerical results demonstrate that the proposed method is highly accurate to deal with transient flow in unsaturated soils for rainfall-induced landslides. In addition, it is found that the numerical method using the Richards equation with the Gardner model may provide a promising solution for different soil textures.

show abstract

Poro-mechanical coupling influences on potential for rainfall-induced shallow landslides in unsaturated soils

Cited by 56 publications

References 35 publications

EDDA 2.0: integrated simulation of debris flow initiation and dynamics considering two initiation mechanisms

EDDA 2.0: integrated simulation of debris flow initiation and dynamics considering two initiation mechanisms

EDDA 2.0: integrated simulation of debris flow initiation and dynamics, considering two initiation mechanisms

Modeling of Transient Flow in Unsaturated Geomaterials for Rainfall-Induced Landslides Using a Novel Spacetime Collocation Method

Contact Info

Product

Resources

About