Mechanics of the Viscous Type Debris Flow (2)- Flume Experiments Using Well-Graded Sediment Mixture

中国雲南省の蒋家溝で典型的な形態が見られる粘性土石流を, 同様の粒度分布を持つ材料による水路実験によって再現した。これにより, 慣用とは相違して, 粘性土石流をニュートン流体としてモデル化するのが適切であることや, 流れの粘性係数, 粒子支持機構, 堆積および侵食の機構, 間欠性の発生原因, 抵抗則等の解明への道筋が明らかになった。
The viscous type debris flow, that typically arises at the Jiangjia gully, Yunnan Province, China, is generated in an experimental flume using the sediment mixture material similar to that in the Jiangjia gully. Different from so far many modellings, the experiments showed that the flow can be well modeled as a Newtonian fluid with very high viscosity. By discussion on the interpretation of the experimental results, the near future approach to the quantitative estimations of the viscosity, the particle supporting mechanism in a laminar flow, depositon and erosion processes, cause of intermittency, resistance law, and so on is made clear.