A model for triggering mechanisms of shallow landslides

Montrasio, Lorella; Valentino, Roberto

doi:10.5194/nhess-8-1149-2008

Cited by 191 publications

(130 citation statements)

References 23 publications

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“…However, the spatial variation of the soil thickness can be Figure 9. From top to bottom: evolution of saturation process through the soil macropores (from Montrasio and Valentino 2008) highly influenced by the widespread presence of agricultural terraces, which represent one of the most relevant peculiarities of the Cinque Terre area. For this reason, we performed an alternative soil thickness estimation by using a morphometric approach.…”

Section: Evaluation Of Trigrs Input Parameters and Assumptions In Thementioning

confidence: 99%

“…Precisely in order to investigate the failure mechanisms of the soil cover in a wide range of initial conditions (i.e. porosity and water content), in a recent study ) specific laboratory flume tests have been conducted on the material sampled near Giampilieri, and the development of the failure process was also numerically simulated with SLIP, a simple physically based model that predicts the triggering of shallow landslides on the basis of the soil characteristics and the rainfall amount (Montrasio 2000;Montrasio and Valentino 2008). The results of the experimental tests substantially agree with the outcome of the numerical simulations, since the mean variation between real and predicted failure time is in the order of a few minutes, even for the longest tests .…”

Section: Evaluation Of Trigrs Input Parameters and Assumptions In Thementioning

confidence: 99%

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Shallow landslide initiation on terraced slopes: inferences from a physically based approach

Schilirò

Cevasco

Esposito

et al. 2018

Geomatics, Natural Hazards and Risk

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In the last years, great efforts have been made to improve the assessment of the temporal and spatial occurrence of rainfall-induced shallow landslides. Therefore, in this paper we used a physically based stability model (TRIGRS) in order to reproduce the landslide event occurred in the Monterosso catchment (Cinque Terre, Eastern Liguria, Italy) on 25 October 2011. The input parameters of the numerical model have been evaluated taking into account the land-use setting and paying specific attention to the evaluation of the spatial variation of soil thickness on terraced areas. The resulting safety factor maps have been compared with the inventory map of the landslides triggered during the event. The simulation results, which have been obtained also considering four different spatial resolutions of the digital terrain model, emphasize the influence of land use in shallow landslide occurrence and indicate the importance of a realistic spatial variation of soil thickness to enhance the reliability of the model. Finally, different triggering scenarios have been defined using hourly rainfall values statistically derived from historical data. The results indicate the proneness of the area to shallow landsliding, given that rainfall events with a relatively low return period (e.g. 25 years) can trigger numerous slope failures.

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Section: Evaluation Of Trigrs Input Parameters and Assumptions In Thementioning

confidence: 99%

Section: Evaluation Of Trigrs Input Parameters and Assumptions In Thementioning

confidence: 99%

Shallow landslide initiation on terraced slopes: inferences from a physically based approach

Schilirò

Cevasco

Esposito

et al. 2018

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

show abstract

“…Models used in such applications include, among others, the Combined Hydrology and Stability Model (CHASM; Thiebes et al, 2014), the High Resolution Slope Stability Simulator (HIRESS; Rossi et al, 2013); the SLopeInfiltration Distributed Equilibrium (SLIDE; Liao et al, 2010;Montrasio and Valentino, 2008), the Shallow Landslides Instability Prediction (SLIP; Montrasio, 2000;Montrasio et al, 2011). Another slope stability model is the modular software package GeoStudio (2012), in which SEEP/W and SLOPE/W plugins are used to simulate the instability of slopes during extreme rainfall events.…”

Section: Introductionmentioning

confidence: 99%

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Mendes

Andrade

Tomasella

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Located in a mountainous area of south-eastern Brazil, the municipality of Campos do Jordão has been hit by several landslides in recent history. Among those events, the landslides of early 2000 were significant in terms of the number of deaths (10), the population affected and the destruction of infrastructure that was caused. The purpose of this study is to assess the relative contribution of natural and human factors to triggering the landslides of the 2000 event. To achieve this goal, a detailed geotechnical survey was conducted in three representative slopes of the area to obtain geotechnical parameters needed for slope stability analysis. Then, a set of numerical experiments with GEO-SLOPE software was designed, including separate natural and anthropic factors. Results showed that natural factors, that is, high-intensity rainfall and geotechnical conditions, were not severe enough to trigger landslides in the study area and that human disturbance was entirely responsible for the landslide events of 2000. Since the anthropic effects used in the simulations are typical of hazardous urban areas in Brazil, we concluded that the implementation of public policies that constrain the occupation of landslide susceptible areas are urgently needed.

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“…Soil water content, pore water pressure, and matric suction data from continuous monitoring of unsaturated soils have been proved very useful in di erent kinds of stability models, such as closed-form equations based on a limit equilibrium analysis [13][14][15], physically based models [16][17][18][19], and Finite Element Models (FEM).…”

Section: Introductionmentioning

confidence: 99%

Antecedent rainfall induced shallow landslide-A case study of Yunnan landslide, China

et al. 2017

Scientia Iranica

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Abstract. We present a case study of antecedent rainfall induced failure of engineering slope. The impacts of pore-water pressure, pore-water pressure increment, water content, and the factor of safety are investigated by numerical models for an actual slope in Yunnan, China. The results indicate that antecedent rainfall plays an important role in the stability of the slope. The model reasonably explains the time lag between the occurrences of rainfall and landslides. Pore-water pressures signi cantly change at the upper layer of redclay slope; the occurrence of cracks at the top of the slope agrees with the eld observations before landslide. The saturated zone of the slope gradually expands from the top to bottom of the slope; the major reason for landslide is that the surface stagnant water, after rainfall, gradually in ltrates into the weathered gneiss rock, resulting in decrease in the strength of weathered gneiss rock. Then, the weight of the later rainfall leads to landslide of the slope. The factor of safety of the slope is evaluated by the modi ed limit equilibrium methods. It is shown that the actual failure occurs when the calculated factor of safety approaches its minimum, i.e., 0.97. The landslide is characterized by shallow landslides.

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A model for triggering mechanisms of shallow landslides

Cited by 191 publications

References 23 publications

Shallow landslide initiation on terraced slopes: inferences from a physically based approach

Shallow landslide initiation on terraced slopes: inferences from a physically based approach

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Antecedent rainfall induced shallow landslide-A case study of Yunnan landslide, China

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