MOVEMENT PATTERN OF DEBRIS FLOW — IJEGE
 
 
Document Actions

MOVEMENT PATTERN OF DEBRIS FLOW



Abstract:
A kinematic model is developed to estimate the velocity and runout distance of a gravitative debris flow. The characteristics and the different stages of development of a gravitative flow are first described. The equations governing the motion during the flow are then derived based on the Newtonian translation motion with some simplified assumptions on the erosion process along the flow path. After the motion is initiated, the debris is considered to behave as a frictional material with the friction angle during motion being a function of the distance travelled measured from the initiation point. The equations derived are applied to two well-documented case records to assess their applicability. The application shows that the computed runout distances are slightly higher than the measured values. This slight error on the safe side is consistent with the simplified assumptions used in deriving the equations. The small error is acceptable for engineering designs in areas vulnerable to debris flows.

Authors:
Az. C. Kang - Dongchuan Debris Flow Observation and Research Station, Chinese Academic of Sciences
K.Tim Law - Department of Civil and Environmental Engineering, Carleton University, Canada and visiting the University of Hong Kong
Chack Fan Lee - Department of Civil Engineering, University of Hong Kong
Xiao Qing Chen - Institute of Mountain Hazards and Environment, CAS, Chengdu, China
Keywords
Debris flow, movement pattern, kinetic mode, case record
Statistics