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| Titel |
Distributed modelling of shallow landslides triggered by intense rainfall |
| VerfasserIn |
G. B. Crosta, P. Frattini |
| 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 ; 3, no. 1/2 ; Nr. 3, no. 1/2, S.81-93 |
| Datensatznummer |
250000666
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| Publikation (Nr.) |
 copernicus.org/nhess-3-81-2003.pdf |
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| Zusammenfassung |
| Hazard assessment of
shallow landslides represents an important aspect of land management in
mountainous areas. Among all the methods proposed in the literature,
physically based methods are the only ones that explicitly includes the
dynamic factors that control landslide triggering (rainfall pattern,
land-use). For this reason, they allow forecasting both the temporal and
the spatial distribution of shallow landslides. Physically based methods
for shallow landslides are based on the coupling of the infinite slope
stability analysis with hydrological models. Three different grid-based
distributed hydrological models are presented in this paper: a steady
state model, a transient "piston-flow" wetting front model, and
a transient diffusive model. A comparative test of these models was
performed to simulate landslide occurred during a rainfall event (27–28
June 1997) that triggered hundreds of shallow landslides within Lecco
province (central Southern Alps, Italy). In order to test the potential
for a completely distributed model for rainfall-triggered landslides,
radar detected rainfall intensity has been used. A new procedure for
quantitative evaluation of distributed model performance is presented and
used in this paper. The diffusive model results in the best model for the
simulation of shallow landslide triggering after a rainfall event like the
one that we have analysed. Finally, radar data available for the June 1997
event permitted greatly improving the simulation. In particular, radar
data allowed to explain the non-uniform distribution of landslides within
the study area. |
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