1. No category

Monitoring of Potoška planina landslide
(Karavanke Mountains, NW Slovenia)
Tina Peternel
Geological
Survey of
Slovenia
Proceedings of the 2nd Regional
Symposium on Landslides, Belgrade, 2015
Geographical location:
The Potoška planina landslide is situated in the Karavanke
mountain ridge (NW Slovenia), above the village Koroška Bela.
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Potoška planina landslide

-
Main characteristics of Potoška planina landslide (estimated):
Length: up to 500 m
Width: 200 - 300 m
Average depth: 10 – 15 m
Estimated volume of the sliding mass: 1.8 x106 m3
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(Jež
et al., 2008)
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J. Jež
Geological conditions
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(Jež
et al., 2008)
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Slope mass movements in the Potoška planina
- The upper part of landslide is subjected to rockslides
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Slope mass movements in the Potoška planina
- The main body of landslide is characterized by a more
complex dynamic and is presumed to be slow-motion slip.
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Slope mass movements in the Potoška planina
- The toe of landslide represents the most active part of
landslide. The sliding mass is composed of tectonically
deformed and weathered bedrock and talus material.
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The activity of landslide is evidenced by…
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In the past, the Potoška planina landslide was
investigated with…
RADAR
INTERFEROMETRY
+ GNSS
Milanič, 2011
Komac et al. 2014: Coupling of GPS/GNSS and radar interferometric data for a
3D surface displacement monitoring of landslides; Landslides
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MONITORING OF POTOŠKA PLANINA LANDSLIDE
In order to understand the specifics of a sliding processes, to
assess the surficial displacement rates and changes in the
surface topography and to assess the landslide extend we
applied periodical monitoring using:
• In – situ measurements (geological mapping, etc.)
• Rain-gauge station
• Tachymetric measurement using a total station
• UAV photogrammetry based on structure-from-motion and
multi view stereo photogrammetric techniques
• Terrestrial laser scanning (TLS)
• GNSS data acquired from I2GPS station
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UAV photogrammetry
Microdrone md4-1000
Ground control points
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Olympus Pen E-P1 camera
Leica GPS
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Tachymetric measurement using a total station
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Results so far …
• Surficial displacement - based on direct visual
image comparison of two orthophotos (Powers et
al., 2006)
• Elevation and volume change - to examine the
elevation changes between the two measurements,
the elevations of the second acquisition DEM were
subtracted from the first one on a cell-by-cell basis.
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Surficial displacement
1. observation period (July 2013 - October 2013)
• Observation period:
3 months
• 487 displacement
vectors
• the displacement
direction is
predominantly SW
• Horizontal
displacements with
magnitudes
between 0.1 and 1
m
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Surficial displacement
2. observation period (October 2013 – April 2014)
• Observation period: 7 months
• 444 displacement vectors
• displacement
direction: SW
• Horizontal
displacements
with
magnitudes: 0.3
- 1.8 m
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Surficial displacement
3. observation period (April 2014 – September 2014)
•
•
•
•
Observation period: 5 months
278 displacement vectors
displacement direction: SW
Horizontal displacements with
magnitudes: 0.3 - 1.02 m
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Tachymetric measurements
 The measurements of all object points were obtained in November
2012, July 2013, October 2013 and in April 2014.
 For convenience displacement vectors were converted to monthly
average displacement rates:
 1. time period: 0.002 – 0.2 m/month
 2. time period: 0.004 – 0.5 m/month
 3. time period: 0.1 – 0.3 m/month
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Comparison and verification
- the comparison of the displacement vectors and the
displacements obtained from tachymetric measurements
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Challenges, goals …
- correlation between amount of precipitation (provide by
rain-gauge system) and landslide daily displacements
(provide by GNSS antenna)
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Challenges, goals …
- to quantify displacement rates and volume changes in the
main scarp of landslide using TLS and photogrammetry
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Ongoing IPL project
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Thank you for your attention
Somehow you need
years
 Information
to recognize
[email protected]
something obvious
Tel. 00286 1 28 09 813
…
Geological Survey of Slovenia
Dimičeva ulica 14
SI – 1001 Ljubljana
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