Abstract
　A small snow-avakmche system has been constructed in a cold laboratory and the following measurements were carried out : inpact forces with strain-gauge type pressure transducers; particle concentrations by measuring the electric capacitance or light transmittability; particle motions by using a high-speed video system, etc.
　The wave forms of impact forces measured in this expeliment were considered to depend on the height of the snow flow. The magnitudes of impact forces (P) were reasonably expressed as P=ρu2 where ρ and u are respectively the density and velocity of snow now. The snow flow was found to be composed of characteristic flow untis which seem to casue oscillations of impact forces and particle concentrations observed in the flowing layer.

【キーワード】：雪崩衝撃力, 雪氷混相流, 空間密度

*北海道大学低温科学研究所
The Institute of Low Temparature Science, Hokkaido Univ.