Rainfall-induced shallow landslides: a model for the triggering mechanism of some case studies in Northern Italy

Montrasio, Lorella; Valentino, Roberto; Losi, Gian Luca

doi:10.1007/s10346-009-0154-7

Cited by 58 publications

(31 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, a model adopting Darcy's law (Montrasio and Valentino, 2008;Montrasio et al, 2009Montrasio et al, , 2012 was used to calculate the evolution of m during the rainfall process. In the model, assuming the current time is t 0 and the dimensionless thickness of the saturated layer at t 0 is m 0 , the contribution of rainfall at t i to m 0 , which is denoted by m i,0 , will be:…”

Section: Theoretical Modelmentioning

confidence: 99%

A simplified physically based coupled rainfall threshold model for triggering landslides

Yu-ming

Lan

Gao

et al. 2015

Engineering Geology

View full text Add to dashboard Cite

A number of rainfall threshold models for triggering landslides have been developed in either empirical or physical manner. The objective of an empirical rainfall threshold model is to establish a relationship between rainfall intensity and duration, which is a line on a log-log diagram, although the mechanism of the relationship following the power law is not yet well understood. The sufficiency of rainfall and landslide data is also a significant concern for empirical models. A simplified physically based rainfall threshold model is developed by coupling the Mohr-Coulomb law and Darcy's law based on the assumptions that the slope has an infinite length and that discrete water diffusion is physically based. The power-law mechanism for the relationship between rainfall intensity and duration for the initiation of a landslide is investigated using this physically based model. The rainfall threshold calculated with the model shows that the threshold follows the power law for short rainfall durations whereas it gradually tends towards a constant value for long rainfall durations. Case studies have shown that a plausible threshold for regions that lack sufficient landslide and rainfall data can be obtained via the model. The model is also applied to cases which occurred in regions geologically typical of Fujian Province, southeast China. The landslide distribution predicted by our model accords with the interpretation of high resolution satellite imagery, and this suggests that the proposed physically based model also effectively determines rainfall thresholds for triggering regional landslides.

show abstract

Section: Theoretical Modelmentioning

confidence: 99%

A simplified physically based coupled rainfall threshold model for triggering landslides

Yu-ming

Lan

Gao

et al. 2015

Engineering Geology

View full text Add to dashboard Cite

show abstract

“…The simplified SLIP (Shallow Landslides Instability Prediction) model, which is applied in the present work, falls within this context (Montrasio, 2000) and has been applied in the analysis of many case histories on a local scale Valentino, 2007, 2008;Montrasio et al, 2009). Dynamically, this model takes into account the stability condition of a slope, the characteristics of the soil and the rainfall amounts, including previous rainfalls.…”

Section: Montrasio Et Al: Towards a Real-time Susceptibility Assementioning

confidence: 99%

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Montrasio

Valentino

Losi

2011

Nat. Hazards Earth Syst. Sci.

114

View full text Add to dashboard Cite

Abstract. In the framework of landslide risk management, it appears relevant to assess, both in space and in time, the triggering of rainfall-induced shallow landslides, in order to prevent damages due to these kind of disasters. In this context, the use of real-time landslide early warning systems has been attracting more and more attention from the scientific community. This paper deals with the application, on a regional scale, of two physically-based stability models: SLIP (Shallow Landslides Instability Prediction) and TRIGRS (Transient Rainfall Infiltration and Grid-based Regional Slope-stability analysis). A back analysis of some recent case-histories of soil slips which occurred in the territory of the central Emilian Apennine, Emilia Romagna Region (Northern Italy) is carried out and the main results are shown. The study area is described from geological and climatic viewpoints. The acquisition of geospatial information regarding the topography, the soil properties and the local landslide inventory is also explained.The paper outlines the main features of the SLIP model and the basic assumptions of TRIGRS. Particular attention is devoted to the discussion of the input data, which have been stored and managed through a Geographic Information System (GIS) platform. Results of the SLIP model on a regional scale, over a one year time interval, are finally presented. The results predicted by the SLIP model are analysed both in terms of safety factor (F s ) maps, corresponding to particular rainfall events, and in terms of time-varying percentage of unstable areas over the considered time interval. The paper compares observed landslide localizations with those predicted by the SLIP model. A further quantitative comparison between SLIP and TRIGRS, both applied to the Correspondence to: R. Valentino (roberto.valentino@unipr.it) most important event occurred during the analysed period, is presented. The limits of the SLIP model, mainly due to some restrictions of simplifying the physically based relationships, are analysed in detail. Although an improvement, in terms of spatial accuracy, is needed, thanks to the fast calculation and the satisfactory temporal prediction of landslides, the SLIP model applied on the study area shows certain potential as a landslides forecasting tool on a regional scale.

show abstract

“…Although slope failures may develop due to many factors, such as earthquakes, human-induced factors including the loading of the slope or excavation for construction purposes, the occurrence of landslides in residual soils is mainly attributed to rainfall (Brand 1981(Brand , 1984Fredlund and Rahardjo 1994;Lim et al 1996;Rahardjo et al 1996;Tsukamoto 1998;Montrasio and Valentino et al 2009;Cho 2015). Furthermore, most of the rainfall-induced landslides in residual soils consist of relatively shallow slips above the groundwater table with the thickness of sliding mass smaller than 5 m approximately, and slide along the interface between the soil layer and underlying bedrock Montrasio and Valentino 2009). For example, 1162 rainfall-induced landslides in residual soils occurred in Nanjiang, China during the rainfall on 17-18 September 2011.…”

Section: Introductionmentioning

confidence: 99%

“…It is the increased pore pressure that decreases the effective stress in the soil and thus reduces the soil shear strength, eventually resulting in slope failure (Brand 1981(Brand , 1984Brenner et al 1985;Montrasio et al 2009;Liu and Rong et al 2015). Terzaghi (1950) first presented that rainfall-induced landslides are caused by increased pore pressures and seepage forces during periods of intense rainfall.…”

Section: Introductionmentioning

confidence: 99%

Effect of drag force on stability of residual soil slopes under surface runoff

Wei

Xia

et al. 2018

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

To investigate the effect of drag force on stability of residual soil slopes, a modified approach based on the limit equilibrium method is proposed by establishing a nonlinear coupled mathematical model to calculate the seepage velocities in soils and the runoff velocities at a fluid-solid interface. In this mathematical model, the Navier-Stokes equation and Brinkman-extended Darcy equation are used to describe the incompressible surface runoff and seepage in soils, respectively. Then, the drag force can be derived by adopting Newton's law of internal friction, and the factor of safety (FOS) of residual soil slopes considering drag force can be calculated based on the limit equilibrium method. The modified approach was applied to analyse the stability of rainfall-induced landslides in residual soils in Nanjiang, Sichuan, China, 2011. We found that the runoff depth can significantly control the FOS of the residual soil slopes and cause slope failures. The results of sensitivity analysis highlight the significance for considering drag force due to surface runoff when calculating the FOS of the residual soil slope. The FOS obtained from the modified approach is more reasonable, and this modified approach also can be used for evaluating or predicting rainfall-induced slope instability in residual soils.

show abstract

Rainfall-induced shallow landslides: a model for the triggering mechanism of some case studies in Northern Italy

Cited by 58 publications

References 37 publications

A simplified physically based coupled rainfall threshold model for triggering landslides

A simplified physically based coupled rainfall threshold model for triggering landslides

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Effect of drag force on stability of residual soil slopes under surface runoff

Contact Info

Product

Resources

About