OCR Text |
Show For a given snowfall intensity ( b ), which we assume constant throughout the storm, we can determine the time when the thickness of the freshly fallen snow achieves its critical value Lr- rsi >- J + ^ o I (, 5) where t is the time from the beginning of the snowfall to the moment of descent of the avalanche ( hours), oC. is the slope angle ( degrees), d is the density of the newly fallen snow ( gm cm" 3) , and £ is the intensity of the snowfall ( cm hr" 1). In practice, it is easier to find h from Fig. 1 and divide this value by S than to calculate t directly from ( 15). In order to verify Equation ( 15), we carefully analyzed available information on avalanches of freshly fallen snow for the years 1958- 1964 in the Kirgiz. The analysis showed that the release of such avalanches is closely related to the water content of the snow, the thickness of the freshly fallen snow, and the duration and intensity of the snowfall ( Table l). 10- |