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| Titel |
Prediction of the run out extents of the Slano Blato landslide for future debris flow events |
| VerfasserIn |
Amin Askarinejad, Pascal Leu, Matej Macek, Ana Petkovsek, Sarah Springman |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250083289
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| Zusammenfassung |
| The Slano Blato landslide has a volume of about 1 mio m3 and is located in the western part
of Slovenia. It has been considered to be a potential natural hazard for the village of Lokavec
for more than 200 years. Several mud flows, exhibiting a range of volumes and velocities,
have originated from the landslide body since the year 2000, when the landslide
was reactivated due to an intense rainfall event. A series of obstacles, including
safety dams and deposition ponds, have been constructed for the remediation of the
landslide. These obstacles are designed to absorb and contain future debris flow
hazard.
A prerequisite to any risk analysis is to establish the vulnerability to the hazard event. The
aim of this work is to simulate possible future debris flow scenarios in order to predict the run
out distances, flow heights, impact pressures and potential effects on the downstream village
buildings and infrastructure. The simulations were carried out using the RAMMS program
(RApid Mass MovementS, www.ramms.slf.ch). A three dimensional terrain model
of the landslide area and the downstream zones, with or without the inclusion of
the obstacles, was made for the simulations and different scenarios concerning
the released volume, the internal friction and viscosity of the sliding mass were
studied.
The results indicate that low viscosity mudflows with a volume of 5,000 m3 endanger
some parts of Lokavec village. However, the simulations with volumes of 15,000 and 50,000
m3 predict catastrophic effects in terms of either impact pressures or deposition heights for
the majority of houses. Moreover, the simulations confirmed that the choice of the material
properties (internal friction and viscosity), the characteristics of the release hydrograph, event
location, and natural or man-made obstacles play major roles in the run out distances and
impact pressures. |
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