Assessing fracture occurrence using "weighted fracturing density": a step towards estimating rock instability hazard - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Natural Hazards and Earth System Sciences Année : 2004

Assessing fracture occurrence using "weighted fracturing density": a step towards estimating rock instability hazard

Résumé

Based on the assumption that major class of rock instabilities are created by discontinuities, a method is proposed to estimate the fracture density by means of a digital elevation model (DEM). By using the mean orientation, the mean spacing and the mean trace length of discontinuity sets potentially involved in slope instabilities and a DEM, it is possible to calculate the mean number of discontinuities of a given set per cell of the DEM. This would allow for an estimation of the probability of the presence of at least one discontinuity in a given area or simply in a topographic cell of the DEM. This analysis highlights sites potentially affected by rockslides within a region. Depending on the available data, the mean number can be calculated either by area, or along a line parallel to the mean apparent spacing. The effective use of the probability of occurrence is dependent on the size of the discontinuities because short and closely spaced discontinuities will have a 100% probability of occurrence in each favorable location. The a posteriori prediction of a recent rockslide is discussed as an example.
Fichier principal
Vignette du fichier
nhess-4-83-2004.pdf (4.13 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-00299073 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00299073 , version 1

Citer

M. Jaboyedoff, F. Baillifard, F. Philippossian, J.-D. Rouiller. Assessing fracture occurrence using "weighted fracturing density": a step towards estimating rock instability hazard. Natural Hazards and Earth System Sciences, 2004, 4 (1), pp.83-93. ⟨hal-00299073⟩

Collections

INSU EGU
259 Consultations
261 Téléchargements

Partager

Gmail Facebook X LinkedIn More