A NUMERICAL-SIMULATION OF DEBRIS FLOW AND ITS APPLICATION

Debris flow is the flow of solid-fluid mixture and was treated as the flow of a continuum in routing in this study. A mathematical model was proposed to describe debris flow including deposition process and the n solved numerically with suitable boundary conditions. Laboratory exp eriments were also conducted for comparison and calibration of the num erical results as well as for investigation of debris flow phenomena. The numerical model was also applied to simulate the debris flow cause d by heavy rainfall in Tungman village of Hualien County located in th e east of Taiwan on 23 June 1990. The simulated bed topographies in al luvial fan were in good agreement with those obtained from laboratory experiments and field observations.