Dynamical Behaviors of Snow Particles in the Saltation Layer

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概要

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• A photographic technique was developed to analyze dynamical behaviors of saltating particles in blowing snow. Each photograph taken with this technique can give information of trajectories of flying snow particles as well as their velocities and accelerations at each height. The analyses have shown that horizontal drag the surrounding air flow exerts on saltating particles is of Stokes type and the drag coefficient C_D can be represented as C_D=N/Re where Re is the Reynolds number and N is numerical constant ranging from 0.6 to 9. As for vertical motions a substantial downward force was found to act on a snow particle at the time of both its ascent and descent; Ascending snow particles did not reach the maximum height <υ_0>^2/2g where υ_0 and g are respectively the initial vertical velocity and the acceleration of gravity, and the maximum heights measured were smaller than those calculated by taking account of drag due to the surrounding air.

• 国立極地研究所の論文

著者

• Maeno Norikazu

  The Institute Of Low Temperature Science Hokkaido University

• Araoka Kuniaki

  The Institute of Low Temperature Science, Hokkaido University

• Araoka Kuniaki

  The Institute Of Low Temperature Science Hokkaido University

関連論文

• Power spectral analysis of snow densities at Mizuho Station, Antarctica
• Initial stage of densification of snow in Mizuho Plateau, Antarctica
• Measurements of Air Permeability and Elastic Modulus of Snow and Firn Drilled at Mizuho Station, East Antarctica
• Densification rates of snow at polar glaciers
• The Electrical Behaviors of Antarctic Ice Drilled at Mizuho Station, East Antarctica
• Dynamical Behaviors of Snow Particles in the Saltation Layer
• Structural Characteristics of Firn and Ice Cores Drilled at Mizuho Station, East Antarctica

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