Item: Comparison of velocities of the dry and wet snow avalanches at makunosawa valley in myoko, japan
Title: Comparison of velocities of the dry and wet snow avalanches at makunosawa valley in myoko, japan
Proceedings: 2002 International Snow Science Workshop, Penticton, British Columbia
Authors: Y. Takeuchi, K Yamanoi, Y. Endo, S. Murakami, S. Niwano and S. Watanabe, Tohkamachi Experimental Station, Forestry and Forest Products Research Institute, K Izumi, The Research Institute of Hazards in Snowy Areas, Niigata University, T. Takeshi
Abstract: Large-scale natural avalanches of dry and wet snow were occurred at Makunosawa valley in Myoko, Japan. The both avalanches started in the same zone and flew on the same path. The mean velocities of the two avalanches were obtained from the tremor of a geophone and the picture of a video camera. These values were compared with calculated results by Voellmy's approach. The mean velocity of the dry snow avalanche was 43 ms-I and it was 10 ms-I faster than the calculated values of 32 - 34 rns-I. On the other hand, the mean velocity of the wet snow avalanche was 20 rns-I and 10 rns-I slower than the calculated values of 30 - 32 rns-I.
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Keywords: avalanche velocity, dry snow avalanche, wet snow avalanche, makunosawa valley
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