Landslide risk management in Switzerland

Lateltin, O.; Haemmig, Christoph; Raetzo, Hugo; Bonnard, C.

doi:10.1007/s10346-005-0018-8

Cited by 131 publications

(92 citation statements)

References 3 publications

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“…The related processes are usually understood as translational sliding movements of soil material along a pre-defined slip surface at a depth of up to 2 m (Cruden and Varnes, 1996;Lateltin et al, 2005). In Austria, shallow landslides are typically triggered by heavy rainfalls (Andrecs et al, 2002;Markart et al, 2007;972 T. Zieher et al: Calibration of a dynamic physically based slope stability model tures and infrastructure, as well as a loss of agricultural land.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis and calibration of a dynamic physically based slope stability model

Zieher

Rutzinger

Schneider‐Muntau

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Physically based modelling of slope stability on a catchment scale is still a challenging task. When applying a physically based model on such a scale (1 : 10 000 to 1 : 50 000), parameters with a high impact on the model result should be calibrated to account for (i) the spatial variability of parameter values, (ii) shortcomings of the selected model, (iii) uncertainties of laboratory tests and field measurements or (iv) parameters that cannot be derived experimentally or measured in the field (e.g. calibration constants). While systematic parameter calibration is a common task in hydrological modelling, this is rarely done using physically based slope stability models. In the present study a dynamic, physically based, coupled hydrological-geomechanical slope stability model is calibrated based on a limited number of laboratory tests and a detailed multitemporal shallow landslide inventory covering two landslide-triggering rainfall events in the Laternser valley, Vorarlberg (Austria). Sensitive parameters are identified based on a local one-at-a-time sensitivity analysis. These parameters (hydraulic conductivity, specific storage, angle of internal friction for effective stress, cohesion for effective stress) are systematically sampled and calibrated for a landslide-triggering rainfall event in August 2005. The identified model ensemble, including 25 "behavioural model runs" with the highest portion of correctly predicted landslides and non-landslides, is then validated with another landslide-triggering rainfall event in May 1999. The identified model ensemble correctly predicts the location and the supposed triggering timing of 73.0 % of the observed landslides triggered in August 2005 and 91.5 % of the observed landslides triggered in May 1999. Results of the model ensemble driven with raised precipitation input reveal a slight increase in areas potentially affected by slope failure. At the same time, the peak run-off increases more markedly, suggesting that precipitation intensities during the investigated landslide-triggering rainfall events were already close to or above the soil's infiltration capacity.

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis and calibration of a dynamic physically based slope stability model

Zieher

Rutzinger

Schneider‐Muntau

et al. 2017

Nat. Hazards Earth Syst. Sci.

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“…Landslides can be easily recognized by means of this approach, and geomorphological features associated with mass movements -such as scarps, counterscarps, trenches, debris flows, rockfalls and debris fans -can also be mapped. Based on these morphological characteristics, it will be also possible to define a qualitative state of activity (not based directly on their velocity), leading to the definition of landslide intensity (low, medium and high), in accordance with the landslide hazard degree calculation guidelines developed in Switzerland (Lateltin et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Definition of the glacial stadials in the Bedretto Valley was based on calculating the depression of the equilibrium line altitude of the glaciers (DELA) for all the main local stadials, which were subsequently grouped into regional stadials ( Table 2). The ELA was calculated using the accumulation area ratio (AAR) hypsometric method, based on a 0.67 ratio for the accumulation surface/total surface of a glacier (Kerschner, 1976;Gross et al, 1977), corresponding to a ratio of 2 : 1 between the accumulation surface and the ablation surface of a glacier. The DELA was calculated on the basis of the altitude difference between the former ELA and the ELA calculated for the end of the Little Ice Age (1850-1860 AD in the central and southern Swiss Alps), considered as the last important glacial stadial with the glaciers in a condition of climatic equilibrium (Dorthe-Monachon and Schoeneich, 1993).…”

Section: Case Study 2: Multi-methods Assessment Of Slope Tectonics Actmentioning

confidence: 99%

Improvements in 3-D digital mapping for geomorphological and Quaternary geological cartography

Ambrosi¹,

Scapozza²

2015

Geogr. Helv.

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Abstract. In recent decades, GIS tools have been directly applied to photo-interpretative geomorphological and geological mapping. Although these tools are powerful and effective tools in the creation of digital maps, it is often very difficult to obtain a correct recognition of the nature and boundaries of geomorphological landforms using two-dimensional images. In addition, the output typically requires some improvements, usually by means of field verifications or using oblique field photographs. The aim of this paper is to present the ArcGDS ™ tool, which allows the direct exploitation, visualization and digitization of stereoscopic digital linear scanned images (e.g. digital image strips, © swisstopo). Through two case studies, we show how 3-D digital mapping makes it possible to produce Quaternary geological and geomorphological maps with a limited complementary fieldwork approach and to provide a quantitative assessment of surface deformations through the acquisition of precise elevation coordinates. Combined with high-resolution digital elevation models, ArcGDS ™ is a powerful tool, particularly over large areas, as well as under forest cover and on very steep slopes.

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“…Established according to the Swiss Guidelines for hazard zoning (Raetzo et al 2002;Lateltin et al 2005), important features of this procedure, based on trajectory modelling, are a quantitative consideration of the rock fall failure frequency and the actual combination of energy and frequency for hazard assessment.…”

Section: Original Cadanav Methodologymentioning

confidence: 99%

“…12, the delineation of a high hazard zone up to x=133 m for T f =20 years·m, as given by original Cadanav, might be quite unfavourable, knowing that the new approach predicts in fact a moderate hazard zone between x=60 and x=120 m, approximately. As explained by Lateltin et al (2005), according to the Swiss Codes such a space could be destined to some development, instead of being totally forbidden. The same happens for the area located between x=40 and x=135 m, for T f =150 years·m, characterised by a sequence of low and moderate hazard zones.…”

Section: Data Analysis and Simulationmentioning

confidence: 99%

New Cadanav methodology for quantitative rock fall hazard assessment and zoning at the local scale

Abbruzzese

Labiouse

2013

Landslides

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The rights are held by Springer-Verlag Wien.The final publication is available at http://link.springer.com. Abstract. Rock fall hazard zoning is a challenging yet necessary task to be accomplished for planning an appropriate land use in mountainous areas. Methodologies currently adopted for elaborating zoning maps do not provide satisfactory results though, due to uncertainties and related assumptions characterising hazard assessment. The new Cadanav methodology, presented in this paper, aims at improving quantitative hazard assessment and zoning at the local scale, by reducing uncertainties mainly related to the technique for combining rock fall intensity and frequency of occurrence. Starting from available information on rock fall failure frequency and trajectory simulation results, the procedure merges in a strict way temporal frequency, probability of reach and energy data, and evaluates the hazard degree by means of "hazard curves". These curves are described at each point of the slope by a series of energy-return period couples representing the hazardous conditions which may possibly affect that location. The new Cadanav methodology is here detailed and compared to its original version. Hazard zoning results are illustrated along two different 2D slope profiles, for linear homogeneous cliff configurations, and according to the Swiss intensity-frequency diagram for rock fall hazard zoning. However, the procedure can be easily used with any other intensity-frequency diagram prescribed in national guidelines and, additionally, extended to problems involving 3D topographies.

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Landslide risk management in Switzerland

Cited by 131 publications

References 3 publications

Sensitivity analysis and calibration of a dynamic physically based slope stability model

Sensitivity analysis and calibration of a dynamic physically based slope stability model

Improvements in 3-D digital mapping for geomorphological and Quaternary geological cartography

New Cadanav methodology for quantitative rock fall hazard assessment and zoning at the local scale

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