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| Titel |
Kinematics of a mass movement constrained by sparse and inhomogeneous data |
| VerfasserIn |
M. Karbon, E. Brückl, E. Hegedüs, A. Preh |
| 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. 6 ; Nr. 11, no. 6 (2011-06-06), S.1609-1618 |
| Datensatznummer |
250009482
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1609-2011.pdf |
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| Zusammenfassung |
| On 12 February 2008, a landslide occurred along a 50 m high bank of the
Danube river near Dunaszekcsö, Hungary. The initial state is only
incompletely documented and the geodetic data acquired after the mass movement
are sparse. A generalized 3-D topographic model of the landslide and its
surrounding area was assembled and a representative longitudinal profile
extracted. The reconstruction of the original surface is based on an
orthophoto as well as on morphological considerations. Recorded observations
include the locations of the outcrops of basal sliding surfaces,
displacements at the main scarp and in the lower part of the slide, and a
value to describe the total mass transport. Such sparse and inhomogeneous
data were insufficient to derive a comprehensive documentation of the
landslide or obtain adequate constraints for an accurate numerical analysis.
Therefore, slider block models were fitted to the field data, which have only
a small number of free parameters. A general view on the morphology of the
mass movement justifies its classification as a rotational slide. A double
slider block model fits all observational parameters within their error
margin and supplies valuable information on the geometry of the slide.
Estimates of the residual friction angles were derived and the question of
reactivation was addressed. Finite Difference (FD) modelling and the
application of conventional stability analysis support the geometry of the
slider blocks and the computed average residual friction angles. Generally,
the results are assumed to represent preliminary information, which could
only be attained by the combination of the thinly distributed geodetic data
with qualitative morphological observations and the implementation of a
model. This type of information can be gained quickly and may be valuable
for preliminary hazard mitigation measures or the planning of a
comprehensive exploration and monitoring program. |
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