02 imprevedibilita fenomeno_en
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Debris flows are an unpredictable natural phenomenon that can occur suddenly in both time and space. In time, rainfall forecasting in mountainous areas cannot precisely determine where or when debris flows will occur due to the small time and space scales of storm cells. In space, debris flows may take new paths not previously used or occur in locations that have not seen them before, even after significant rainfall events. Debris flows can travel unpredictably through torrents along stream beds or carve new channels on fans.
02 imprevedibilita fenomeno_en
- 1. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Debris flows: quite an unforeseeble/ unpredictable phenomenon in time and space
- 2. Carlo Gregoretti23/05/2017 Mekele University - Debris flows 1) In time Rainfall forecasting in a mountain environment is not possible with the precision requested for the determination of debris flow occurence: time resolution of storm cell: 15 minutes or less space resolution of a storm cell: 200 m. 2) In space Recurrent debris flows can deviate from usual path or a new one can origin after some heavy meteorological event in a place where such an event never occurred Debris Flow: quite an unforeseeable phenomenon in time (1) and unpredictable space (2)
- 3. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Debris Flow: quite an unforeseeable phenomenon in time - 1 Debris flow initiation area
- 4. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Debris Flow: quite an unforeseeable phenomenon in time - 2 Rainfall depths corresponding to the debris flows of 23 July 2015 (a,b) and 4 August 2015 (c,d)
- 5. Carlo Gregoretti 23/05/2017 Mekele University - Debris flows Debris Flow: quite an unforeseeable phenomenon in space - 1 1940 - 1960 1980 - 2006 1960 - 1980 Rio Acquabona Negra at km 98 of National Road SS 51 Alemagna 23/05/2017 Mekele University - Debris flows
- 6. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Debris Flow: quite an unforeseeable phenomenon in space - 2 The debris flow on the central picture activated for the first time in August 2009 and threatened the regional road SR 48. Google-Earth 2004 aerial photograph 2006 after the event in 2009 Debris flow occurred at Auronzo (SR 48) August 8th, 2009
- 7. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Debris flow: where does it routes and which route does it travel? Debris flow routes in torrent along thalweg (1) or excavates a channel on a fan (2): old ch. new ch.
- 8. Carlo Gregoretti23/05/2017 Mekele University - Debris flows The area of Fiames subject to debris activity
- 9. Carlo Gregoretti23/05/2017 Mekele University - Debris flows Spreading and deposition area of debris flow: deviation from original path of the debris flow occurred the 5th of July 2006 Deviation from the original path - 1
- 10. Carlo Gregoretti23/05/2017 Mekele University - Debris flows old channel new channel Retaining basin Spreading and deposition area of debris flow: deviation from original path of the debris flow occurred the 4th of July 2011. Downstream view. Deviation from the original path - 2
- 11. Carlo Gregoretti23/05/2017 Mekele University - Debris flows August 2010 4th of July 2011 new channel Old channelnew direction Retaining basin Spreading and deposition area of debris flow: deviation from original path of the debris flow occurred the 4th of July 2011. Upstream view. Deviation from the original path - 3
- 12. Carlo Gregoretti 23/05/2017 Mekele University - Debris flows August 2010 4th of July 2011 new channel Old channel 18th of August 2011 18th of August 2011 Deviation from the original path - 4 Spreading and deposition area of debris flow: deviation from original path of the debris flow occurred the 18th of August 2011. Upstream view.
- 13. Carlo Gregoretti23/05/2017 Mekele University - Debris flows all debris flow events recorded at Fiames Red lines = all debris flows routing path Blue area = area involved by occurred debris flows Deviation from the original path: hystorical view