| OCR Text |
Show 12 rakes was somewhat larger than above, but 3.6 m above Rake 33 it was still 40 to 60 cm. This can be attributed to the limited damming effects of the defenses and the very high plasticity of the snow cover." " On 21 November 1958, 25 light- metal glide shoes were installed in a thin snow cover in the vicinity of Snow Net No. 303 ( single snow net 2x2 m). The objective was to test the influence zone of the defense structure. The experiment was terminated 23 April 1959 with a wet, cohesionless snow layer. The research results were disappointing insofar as that practically no damming effect of the structure on the snow cover could be detected. In the course of five months the glide paths ranged from 0 to 135 cm, with an average of 66 cm. Ve consider this to be very high for a defended zone. The glide distance of a metal shoe was governed, not by its position in respect to the supporting structure, but by the ground conditions and the slope angle." In the winter of 1959/ 60, the damming effect of a single, isolated snow net ( No. 87, 2x2 m) was imperceptible. The influence of supporting structures on gliding was also investigated in other defense systems. Even at 3 m above the supporting members, glide paths of 10 cm or more were commonly measured. In the winters of 1959/ 60, 1960/ 61 and 1962/ 63, an average of 28 cm was measured at five sites in the defense systems " Mattstock" at Amden, " Kunihorn" at St. Antoenien and " Kneugrat" at Braunwald. A longer glide path of 60 cm was found only 3./ » m behind the V0BAG Snow Bridge Mo. 23/ 3 at Kunihorn. During glide winters, the uphill effect of supporting structures is minimal around 3 m and practically disappears 4 m away. |
