Tomohiko KACHI

Study of Avalanche Control by Artificial Release Technique

Norio HAYAKAWA

This study consists of three parts related to avalanche control technique.
1) Experiments were conducted on explosive detonation inside a snow layer. In these experiments, destruction of snow layer and deformation of the destructed snow layer were observed. It is found that explosive detonation within the snow layer generates two domains, one a congealed domain and the other a destructed domain.
2) Success or failure of avalanche release by the avalanche blaster "Gaz.ex" was forecasted by applying discriminant analysis. The discriminant analysis based on the Gaz.ex performance data produces the forecasting formula for the outcome of releasing the artificial avalanche with correct prediction of 75 to 81 per cent.
3) The numerical simulation program for flow-type or powder-snow-type avalanche was formulated and run for a number of observed cases. The models for two types of avalanche produce the avalanche motion in agreement with the observed cases by adjusting the friction coefficient.