流動土塊の堆積機構に関する研究

Abstract

The project has been conducted in order to develop the method for predicting the runoutdistance of a soil block and a debris flow. The authours have presented a friction law in theforegoing papers.The friction law, which is a function of particle concentration, particle diameter and flow depth, is tested by flume experiments concerning liquified soil block and debri flow. The motion ofdebris flow is evaluated well by the formula.Flume experiments are carried out to investigate the process of debris flow deposition.The experimental results show that the running out distance of debris flow and the final shape ofdebris fan greately depend on particle size as well as slope gradient.Two numerical methods to calculate the shape of debris fan, which are based on Eulerianand Lagrangian coordinate systems respectively, are proposed. The final shapes simulated by thesemodels coincide with those from experiments.