The document discusses hazard management in Spreitgraben, Switzerland, an area affected by debris flows. It summarizes the October 2011 debris flow event that damaged infrastructure and discusses ongoing monitoring and risk management efforts. These include an early warning system using sensors to detect flows, as well as long-term management strategies like resettlement planning and defining responsibilities of authorities. Overall management of risks in the debris flow-prone area requires extensive monitoring, early warning systems, and coordinated land use planning between infrastructure owners and authorities.

1. Hazard Management in a Debris Flow Affected Area –
Spreitgraben Switzerland
Global Risk Forum, Davos
August 29th, 2012
Daniel Tobler
Isabelle Kull

2. Content
1. Introduction
2. Events - Causality
Global Risk Forum, Davos
3. Risk Management
4. Conclusions
August 29th, 2012

3. 1. Introduction – Geographic Location
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Guttannen, Central
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Switzerland - Bernese
Oberland

4. Global Risk Forum, Davos
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Channel
1. Introduction – Area Overview

5. Global Risk Forum, Davos
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Aare
1. Introduction – Area Overview

6. 1. Introduction – Damage Potential
Single Houses
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Main Road
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- Main Road
Village
- Main Gas Pipeline

7. Content
1. Introduction
2. Events - Causality
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3. Risk Management
4. Conclusions
August 29th, 2012

8. Global Risk Forum, Davos
August 29th, 2012 2. Events - Causality

9. Global Risk Forum, Davos
August 29th, 2012 2. Events - Causality

10. Global Risk Forum, Davos
August 29th, 2012 2. Events - Causality

11. October 2011
H.R. Keusen, Geotest AG

12. October 2011
H.R. Keusen, Geotest AG

13. October 2011
H.R. Keusen, Geotest AG

14. October 2011
H.R. Keusen, Geotest AG velocity: ~ 15 m/s

15. October 2011
H.R. Keusen, Geotest AG

16. October 2011
H.R. Keusen, Geotest AG

17. H.R. Keusen, Geotest AG
October 2011

18. H.R. Keusen, Geotest AG
October 2011

19. H.R. Keusen, Geotest AG
October 2011

20. H.R. Keusen, Geotest AG
October 2011

21. October 2011
H.R. Keusen, Geotest AG

22. October 2011
H.R. Keusen, Geotest AG

23. October 2011
H.R. Keusen, Geotest AG

24. October 2011
H.R. Keusen, Geotest AG

25. 2. Events - Causality
Rockfall
Ritzlihorn Precipitation Temperature
Melting Permafrost
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Snow - Avalanches
August 29th, 2012
Debris-Fan
Aare River

26. 2. Events - Causality
Ablagerungen Aare
2012 ?
2011
2010
2009
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2007
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27. Global Risk Forum, Davos
August 29th, 2012 2. Events – Causality

28. Global Risk Forum, Davos
August 29th, 2012 2. Events – Causality

29. Global Risk Forum, Davos
August 29th, 2012 2. Events – Causality

30. Content
1. Introduction
2. Events - Causality
3. Risk Management
4. Conclusions
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August 29th, 2012
Planat 2011

31. 3. Risk Management – Monitoring, Early Warning
Trigger Line
Gauge-Radar
Geophone
Webcam
Data Station
Pluviometer
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Temperature Measurement
Laser Scanner
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FMCW-Doppler-Radar
Interferometric-Radar
Red Lights

32. 3. Risk Management – Monitoring, Early Warning
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August 29th, 2012

33. 3. Risk Management – Monitoring, Early Warning
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August 29th, 2012

34. 3. Risk Management – Monitoring, Early Warning
Global Risk Forum, Davos
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35. 3. Risk Management – Monitoring, Early Warning
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36. 3. Risk Management – Monitoring, Early Warning
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- Evacuation Plan
- Controlling

37. 3. Risk Management – Resettlement
Hazard Map
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38. 4. Conclusions
Major Tasks
- How to handle the huge amount of bedload deposition
- Hazard and risk management
Key to Success
- Profound knowledge of ongoing processes
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- vast, sophisticated early warning system
- Role, tasks and responsabilities for all affected elements
August 29th, 2012
(infrastructure owners, authorities) clearly defined
- Land use planning for a entire village (resettlement) at early stage

39. Hazard Management in a Debris Flow Affected Area –
Spreitgraben Switzerland
Thanks
Global Risk Forum, Davos
August 29th, 2012
Daniel Tobler
Isabelle Kull