An analytical solution for rainfall infiltration into an unsaturated infinite slope and its application to slope stability analysis

Zhan, Tony L. T.; Jia, Gao; Chen, Y.-M.; Fredlund, D. G.; Li, H.

doi:10.1002/nag.2106

Cited by 86 publications

(37 citation statements)

References 28 publications

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“…The results are compared with those from an analytical solution by Srivastava and Yeh (1991) and Zhan et al (2013). The scenario of two-layer soil is considered, which is also used in the field application.…”

Section: Verification Test 2: Infiltration Process and Resulting Porementioning

confidence: 99%

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

et al. 2018

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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.

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Section: Verification Test 2: Infiltration Process and Resulting Porementioning

confidence: 99%

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

et al. 2018

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“…The volume conservation is computed at the end of each time step for 298 the inflow, outflow, grid system storage and infiltration loss. by Srivastava and Yeh (1991) and Zhan et al (2013). The scenario of two-layer soil is 340 considered, which is also used in the field application.…”

Section: Initiation Of Debris Flows Due To Bed Erosion 221mentioning

confidence: 99%

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

Shen¹,

Zhang²,

Chen³

et al. 2017

Preprint

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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.

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“…If the porous soil mass is considered to be rigid ( → ∞), (12) reduces to the unsaturated flow equation without coupling between infiltration and deformation in the unsaturated porous medium.…”

Section: Seepage Equationsmentioning

confidence: 99%

“…The exponential variation of hydraulic conductivity with pore-water pressure was applied by Gardner [34]. In many analytical solutions, the relatively simple exponential hydraulic conductivity function of Gardner [34] is employed [12]. The relationship between pore-water pressure and hydraulic conductivity is nonlinear.…”

Section: Analytical Solution To the Coupled Infiltration In A Semi-inmentioning

confidence: 99%

See 1 more Smart Citation

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

Selvadurai

Yang

2017

Geofluids

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Rainfall infiltration into an unsaturated region of the earth's surface is a pervasive natural phenomenon. During the rainfall-induced seepage process, the soil skeleton can deform and the permeability can change with the water content in the unsaturated porous medium. A coupled water infiltration and deformation formulation is used to examine a problem related to the mechanics of a two-dimensional region of semi-infinite extent. The van Genuchten model is used to represent the soil-water characteristic curve. The model, incorporating coupled infiltration and deformation, was developed to resolve the coupled problem in a semi-infinite domain based on numerical methods. The numerical solution is verified by the analytical solution when the coupled effects in an unsaturated medium of semi-infinite extent are considered. The computational results show that a numerical procedure can be employed to examine the semi-infinite unsaturated seepage incorporating coupled water infiltration and deformation. The analysis indicates that the coupling effect is significantly influenced by the boundary conditions of the problem and varies with the duration of water infiltration.

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An analytical solution for rainfall infiltration into an unsaturated infinite slope and its application to slope stability analysis

Cited by 86 publications

References 28 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

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

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