9oct paolo mazzanti-vajont

348 views

Published on

Published in: Sports, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
348
On SlideShare
0
From Embeds
0
Number of Embeds
9
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

9oct paolo mazzanti-vajont

  1. 1. Centro di Ricerca CERI Dipartimento di Scienze della Terra Landslides surfing on water: a preliminary study Paolo Mazzanti & Fabio Vittorio De Blasio www.nhazca.com Padua, 8-10 October 2013 Paolo Mazzanti
  2. 2. Surfing? www.nhazca.com Paolo Mazzanti
  3. 3. Surfing? www.nhazca.com Paolo Mazzanti
  4. 4. Background Vajont landslide (1963) Stromboli landslide (2002) Scilla landslide (1783) Triggering mechanism Geological setting Size Classification They triggered tsunamis! They occurred in Italy!! www.nhazca.com Paolo Mazzanti
  5. 5. Social impact of landslide induced tsunamis More than 3500 casualties in Italy in the last 230 years More than 100 casualties in Norway in the last 150 years Several damages in Chile, France, Canada, China, Panama etc Hostorical events inferred by recent studies (Storegga, Canary Islands, Lake Geneve, Etna etc) What we expect in the future considering that: - the 40% of the world population lives in coastal regions (going to increase) new impoundment and infrastructural projects (e.g. Three Gorges dam, Panama channel) www.nhazca.com Paolo Mazzanti
  6. 6. What we are able to do Identify and characterize landslides Perform advanced monitoring of landslides Simulate the landslides propagation Simulate the tsunami waves But are we really able to understand the landslide to water interaction? We really know the behaviour of a landslide impacting a water surface during its propagation? www.nhazca.com Paolo Mazzanti
  7. 7. What is going on? www.nhazca.com Paolo Mazzanti
  8. 8. The landslide (or part of it) seems to surf on the water… www.nhazca.com Paolo Mazzanti
  9. 9. …like other natural gravitational processes ICE AVALANCHES PIROCLASTIC FLOWS Similar events historically reported for large vulcanic eruptions with piroclastic flows travelling for some km above the water surface (e.g. Vesuvius 79 AD, Krakatau, 1883 AD). www.nhazca.com Paolo Mazzanti
  10. 10. Something observed in lab experiments (1/4) Freundt 2003 www.nhazca.com Paolo Mazzanti
  11. 11. Something observed in lab experiments (2/4) Grani fini 1 2 3 4 5 www.nhazca.com Mazzanti & De Blasio 2010 Paolo Mazzanti
  12. 12. Something observed in lab experiments (3/4) www.nhazca.com Mazzanti & De Blasio 2010 Paolo Mazzanti
  13. 13. Something observed in lab experiments (3/4) www.nhazca.com Mazzanti & De Blasio 2010 Paolo Mazzanti
  14. 14. Something observed in lab experiments (4/4) Clay density: 1.3 kg/m3, Radius 10.5 cm 3 different thicknesses (equivalent masses: 46.6 g, 90.5 g., 117.3 g) Mazzanti & De Blasio 2013 (Conference Volume) www.nhazca.com Paolo Mazzanti
  15. 15. Which parameters control the surfing occurrence? 1) GRAIN SIZE AND DISTRIBUTION “Experiments with coarse grains did not show any surfing!” www.nhazca.com Mazzanti & De Blasio 2010 Paolo Mazzanti
  16. 16. Numerical Analyses Analytical Analyses Which parameters control the surfing occurrence? Mazzanti & De Blasio 2013 (Conference Volume) www.nhazca.com Paolo Mazzanti
  17. 17. Which parameters control the surfing occurrence? 2) LANDSLIDE VELOCITY AND IMPACT ANGLE “Higher velocity and lower angle of inclination are favourable conditions for surfing” 3) LANDSLIDE DENSITY “Higher ratio of the water to landslide density value increases the ratio between impact force and gravity force” Mazzanti & De Blasio 2013 (Conference Volume) www.nhazca.com Paolo Mazzanti
  18. 18. Surfing implication on the landslide tsunami generation Landslide front thickness Surfing? Landslide front velocity Landslide acceleration Froude number Air cavitation (Fritz, 2003) Mazzanti & De Blasio 2013 (Conference Volume) www.nhazca.com Paolo Mazzanti
  19. 19. Conclusions - Surfing may occurr - Peculiar characteristics of the landslide mass are required - Surfing is probably more common than expected - Tsunami generation may be modified by the surfing Hence We hope that this study would inspire someone to performed more advanced studies on this matter! www.nhazca.com Paolo Mazzanti
  20. 20. Thank you! www.nhazca.com Paolo Mazzanti

×