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| Titel |
Assessing fracture occurrence using "weighted fracturing density": a step towards estimating rock instability hazard |
| VerfasserIn |
M. Jaboyedoff, F. Baillifard, F. Philippossian, J.-D. Rouiller |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 1 ; Nr. 4, no. 1 (2004-03-09), S.83-93 |
| Datensatznummer |
250001468
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| Publikation (Nr.) |
 copernicus.org/nhess-4-83-2004.pdf |
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| Zusammenfassung |
| 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. |
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