Geological and geotechnical investigation of a shallow translational slide along a weathered rock/soil contact for the purpose of model development and hazard assessment

Valley, Benoît; Thuro, Kurosch; Eberhardt, Erik; Raetzo, Hugo

doi:10.1201/b16816-54

Cited by 3 publications

(4 citation statements)

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“…soil-like behaviour (Dearman, 1976;I.S.R.M., 1978;Dearman and Irfan, 1978;I.A.E.G., 1981;G.C.O., 1984, 1988Gullà and Matano, 1997); the relevance for the slope instabilities (Deere and Patton, 1971;Hencher et al, 1984;Brand, 1985;Nishida and Aoyama, 1985;Cascini et al, 1992Cascini et al, , 1994Gullà and Nicoletti, 1996;Lacerda and Santos, 2000;Calcaterra et al, 2004;Gullà et al, 2004a;Lacerda, 2004;Terranova et al, 2004;Valley et al, 2004). Therefore, weathering survey can be useful for different purposes.…”

Section: Introductionmentioning

confidence: 95%

Weathering grade of rock masses as a predisposing factor to slope instabilities: Reconnaissance and control procedures

2007

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Section: Introductionmentioning

confidence: 95%

Weathering grade of rock masses as a predisposing factor to slope instabilities: Reconnaissance and control procedures

2007

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“…Since, the trigger of the 2005 event is undeniably the rain, human activities could have played a role only as destabilizing factors. Examples of landslides triggered by rain events on slopes destabilized by the modification of pore pressure induced by pipe leaks have been observed in Switzerland, in Les Diablerets (Jaboyedoff and Bonnard, 2007) and in Lutzenberg (Valley et al, 2004). This second example is especially interesting since the landslide occurred within an event involving hundreds of landslides and debris flows, and since this particular landslide would not have occurred, thanks to the authors, without the pipe leak.…”

Section: P Nicolet Et Al: Shallow Landslide's Stochastic Risk Modelmentioning

confidence: 97%

“…We prefer to define hazard in terms of frequency, rather than in terms of probability since we are dealing with events that can be considered as repetitive over a large area (van Westen et al, 2006). Indeed, if the events are repetitive, Kaplan (1997) suggests to use the frequency rather than the probability (or the frequency expressed as a probability distribution), which is also more rigorous since risk is expressed in terms of cost per year.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with deep-seated landslides, shallow landslides usually trigger spontaneously, flow at higher speed and are not likely to affect repeatedly the same location due to the changes in soil stability conditions (e.g. van Westen et al, 2006;Corominas and Moya, 2008). Consequently, most research efforts focus on the prediction of their exact location and, less frequently, their timing.…”

Section: Introductionmentioning

confidence: 99%

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Shallow landslide's stochastic risk modelling based on the precipitation event of August 2005 in Switzerland: results and implications

Nicolet

Foresti

Caspar

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. Due to their relatively unpredictable characteristics, shallow landslides represent a risk for human infrastructures. Multiple shallow landslides can be triggered by widespread intense precipitation events. The event of August 2005 in Switzerland is used in order to propose a risk model to predict the expected number of landslides based on the precipitation amounts and lithological units. The spatial distribution of rainfall is characterized by merging data coming from operational weather radars and a dense network of rain gauges with an artificial neural network. Lithologies are grouped into four main units, with similar characteristics. Then, from a landslide inventory containing more than 5000 landslides, a probabilistic relation linking the precipitation amount and the lithology to the number of landslides in a 1 km 2 cell, is derived. In a next step, this relation is used to randomly redistribute the landslides using Monte Carlo simulations. The probability for a landslide to reach a building is assessed using stochastic geometry and the damage cost is assessed from the estimated mean damage cost using an exponential distribution to account for the variability. Although the model reproduces well the number of landslides, the number of affected buildings is underestimated. This seems to result from the human influence on landslide occurrence. Such a model might be useful to characterize the risk resulting from shallow landslides and its variability.

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Shallow landslides stochastic risk modelling based on the precipitation event of August 2005 in Switzerland: results and implications

Nicolet¹,

Foresti²,

Caspar³

et al. 2013

Preprint

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Abstract. Due to their relatively unpredictable characteristics, shallow-landslides represent a risk for human infrastructures. Multiple shallow-landslides can be triggered by large spread precipitation events. The event of August 2005 in Switzerland is used in order to propose a risk model to predict the expected number of landslides based on the precipitation amounts and lithological units. The spatial distribution of rainfall is characterized by blending data coming from operational weather radars and a dense network of rain gauges with an artificial neural network. Lithologies are grouped into four main units, with similar characteristics. Then, from a landslide inventory containing more than 5000 landslides, a probabilistic relation linking the precipitation amount and the lithology to the number of landslides in a 1 km2 cell, is obtained. In a next step, this relation is used to randomly redistribute the landslides using Monte-Carlo simulations. The probability for a landslide to reach a building is assessed using stochastic geometry and the damage cost is assessed from the estimated mean damage cost using an exponential distribution to account for the variability. Although the outputs reproduce well the number of landslides, the number of affected buildings is not reproduced by the model. This seems to results from the human influence on landslide occurrence. Such a model might be useful to characterize the risk resulting from shallow-landslides and its variability.

show abstract

Geological and geotechnical investigation of a shallow translational slide along a weathered rock/soil contact for the purpose of model development and hazard assessment

Cited by 3 publications

References 1 publication

Weathering grade of rock masses as a predisposing factor to slope instabilities: Reconnaissance and control procedures

Weathering grade of rock masses as a predisposing factor to slope instabilities: Reconnaissance and control procedures

Shallow landslide's stochastic risk modelling based on the precipitation event of August 2005 in Switzerland: results and implications

Shallow landslides stochastic risk modelling based on the precipitation event of August 2005 in Switzerland: results and implications

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