OCCURENCE MECHANISUM OF SLUSHFLOW AND ITS HAZARD CHARACTERISTICS

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Slushflow and slush avalanche are rapid mass movements of water-saturated snow and occur every year no the eastern slope of Mt.Fuji in Japan, which causes deforostation near the timberline and natural disasters. In spite of recent warmer and less snow winter years, some slushflow disasters occurred not only at Mt.Fuji but also in some small rivers at Tohoku and Hokuriku districts. The most big slushflow disaster occurred in Japan was Ohzikari, Aomori Prefecture on March 22,1945. At that time eighty-eight people were killed and twenty houses crushed by the slushflow.To study a characteristic of slushflow, the mesurements of mechanical properties, impact forces and viscosity of the slush were carried out. Out experiments have shown that slush behaves as "pseudo-plastic" of non-Newtonian fluid with coagulational structures.