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| Titel |
Bedding control on landslides: a methodological approach for computer-aided mapping analysis |
| VerfasserIn |
G. Grelle, P. Revellino, A. Donnarumma, F. M. Guadagno |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2011-05-16), S.1395-1409 |
| Datensatznummer |
250009420
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1395-2011.pdf |
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| Zusammenfassung |
| Litho-structural control on the spatial and temporal evolution of landslides
is one of the major typical aspects on slopes constituted of structurally
complex sequences. Mainly focused on instabilities of the earth flow type, a
semi-quantitative analysis has been developed with the purpose of
identifying and characterizing litho-structural control exerted by bedding
on slopes and its effects on landsliding. In quantitative terms, a
technique for azimuth data interpolation, Non-continuous Azimuth
Distribution Methodological Approach (NADIA), is presented by means of a GIS
software application. In addition, processed by NADIA, two indexes have been
determined: (i) Δ, aimed at defining the relationship between the orientation of
geological bedding planes and slope aspect, and (ii) C, which recognizes
localized slope sectors in which the stony component of structurally complex
formations is abundant and therefore operates an evolutive control of
landslide masses. Furthermore, some Litho-Structural Models (LSMs) of slopes
are proposed aiming at characterizing recurrent forms of structural control
in the source, channel and deposition areas of gravitational movements. In
order to elaborate evolutive models controlling landslide scenarios, LSMs
were qualitatively related and compared with Δ and C quantitative indexes. The
methodological procedure has been applied to a lithostructurally complex
area of Southern Italy where data about azimuth measurements and landslide
mapping were known. It was found that the proposed methodology enables the
recognition of typical control conditions on landslides in relation to the
LSMs. Different control patterns on landslide shape and on style and
distribution of the activity resulted for each LSM. This provides the
possibility for first-order identification to be made of the spatial
evolution of landslide bodies. |
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