Rock Avalanches
Posted in Thesis on 10/27/2008 06:51 pm by MikaFrom Geohazards IV paper:
For rock avalanches, the frictional resistance model typically produces reasonable simulations of the observed runout distance. Hungr and Evans (1996) and Pirulli (2005) used DAN-W to back-analyze 34 different rock avalanches using the frictional resistance model. The calibrated φb values ranged between 8º and 23º with a mean of 16º. For the Canadian cases, the best result with the frictional rheology falls within this range with and φb of 20º.
Hungr and Evans (1996) also noted that the Voellmy rheology produced consistently good debris distribution, velocity profile, and runout distance for f values between 0.03 and 0.24 and ξ between 100 and 1000 m/s2. Only events involving runout across a glacier or substantial entrainment combined with channelization had calibrated coefficients less than 0.1. For the Canadian cases, the best results were obtained with Voellmy as the dominant rheology, with f between 0.02-0.15 and ξ between 250-500 m/s².
