An historical, geomechanical and probabilistic approach to rock-fall hazard assessment

Hantz, Didier; Vengeon, Jean-Marc; Dussauge-Peisser, Carine

doi:10.5194/nhess-3-693-2003

Cited by 94 publications

(61 citation statements)

References 12 publications

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“…Those source areas, which correspond to the detachment zones of the blocks, are usually taken from distinctive evidence such as talus slope and scree deposits below cliff faces (Frattini et al, 2008), field and historical inventory of rockfall (Hantz, 2003). Whether these datasets are available, they are often fragmentary in space and time.…”

Section: Introductionmentioning

confidence: 99%

Identification of potential rockfall source areas at a regional scale using a DEM-based geomorphometric analysis

Loye

Jaboyedoff

Pedrazzini

2009

Nat. Hazards Earth Syst. Sci.

111

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Abstract. The availability of high resolution Digital Elevation Models (DEM) at a regional scale enables the analysis of topography with high levels of detail. Hence, a DEM-based geomorphometric approach becomes more accurate for detecting potential rockfall sources. Potential rockfall source areas are identified according to the slope angle distribution deduced from high resolution DEM crossed with other information extracted from geological and topographic maps in GIS format. The slope angle distribution can be decomposed in several Gaussian distributions that can be considered as characteristic of morphological units: rock cliffs, steep slopes, footslopes and plains. A terrain is considered as potential rockfall sources when their slope angles lie over an angle threshold, which is defined where the Gaussian distribution of the morphological unit "Rock cliffs" become dominant over the one of "Steep slopes". In addition to this analysis, the cliff outcrops indicated by the topographic maps were added. They contain however "flat areas", so that only the slope angles values above the mode of the Gaussian distribution of the morphological unit "Steep slopes" were considered. An application of this method is presented over the entire Canton of Vaud (3200 km 2 ), Switzerland. The results were compared with rockfall sources observed on the field and orthophotos analysis in order to validate the method. Finally, the influence of the cell size of the DEM is inspected by applying the methodology over six different DEM resolutions.

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Section: Introductionmentioning

confidence: 99%

Identification of potential rockfall source areas at a regional scale using a DEM-based geomorphometric analysis

Loye

Jaboyedoff

Pedrazzini

2009

Nat. Hazards Earth Syst. Sci.

111

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“…This inventory concerns rock falls of volume between 10 2 and 10 7 m 3 , distributed on a wall area of 200 m in average height and 120 km in length. The observation period considered was 65 yr for the volumes smaller than 10 5 m 3 , and several centuries for larger volumes (Hantz et al, 2003b). The constant b was estimated at 0.55 (±0.1) and α at 11 rock falls/yr (between 11 × 0.5 and 11 × 2).…”

Section: Introduction and Terminologymentioning

confidence: 99%

“…Without such an inventory, a qualitative assessment is achieved, mainly based on expert judgment (Groupe Falaise, 2001;Hantz et al, 2003b;Effendiantz et al, 2004). Examples of quantitative rock fall hazard and risk assessment are given by Hungr et al (1999, Picarelli et al (2005), Corominas et al (2005), Jaboyedoff et al (2005), Agliardi et al (2009), andAbbruzzese et al (2009).…”

Section: Introduction and Terminologymentioning

confidence: 99%

Quantitative assessment of diffuse rock fall hazard along a cliff foot

Hantz

2011

Nat. Hazards Earth Syst. Sci.

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Abstract.Many works have shown that the relation between rock fall frequency and volume is well fitted by a power law. Based on this relation, a new method is presented which allows estimating the fall frequency and probability for a wall section in a homogenous cliff, considering all possible rock fall volumes. The hazard for an element located at the foot of the cliff, with a minimal energy, is also estimated. The method has been applied to an itinerary, for which the human risk has also been estimated. Rock fall inventories featuring the location, date, and volume of the falls and the dimensions of the fallen compartments (width, length, and thickness) are needed for better estimating of hazard and risk.

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“…2002;Hantz et al 2003;Chau et al 2003), and a characterisation of the blocks observed on the rock face and on the slope. The distribution of the kinetic energy along the slope is computed by means of rock fall trajectory simulations.…”

Section: Original Cadanav Methodologymentioning

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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An historical, geomechanical and probabilistic approach to rock-fall hazard assessment

Cited by 94 publications

References 12 publications

Identification of potential rockfall source areas at a regional scale using a DEM-based geomorphometric analysis

Identification of potential rockfall source areas at a regional scale using a DEM-based geomorphometric analysis

Quantitative assessment of diffuse rock fall hazard along a cliff foot

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

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