Routing Debris Flows with Particle Segregation
Publication: Journal of Hydraulic Engineering
Volume 118, Issue 11
Abstract
A computer simulation method is developed to predict the temporal variations of debris‐flow discharge, solids concentration, and vertical mean particle‐size distribution. A single finite step in the simulation is divided into two stages: In the first stage, a sediment bed composed of a well‐graded mixture is eroded by surface water introduced at the head of a channel, thereby generating a debris flow. In the second stage, larger particles in the debris flow move upward because of dispersive force and are then transported forward faster than smaller particles, which remain in the lower part of the flow because the velocity is slower in the lower layer. Another numerical simulation method is also developed to predict simultaneously the shape of the debris‐deposit area, the distribution of the deposit thicknesses within the area, and the three‐dimensional distribution of the mean diameters of the deposited particles. Both simulation methods are verified using laboratory experiments.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Suwa, H. (1988). “Focusing mechanism of large boulders to a debris‐flow front.” Trans., Japanese Geomorphological Union, Kyoto, Japan, 9‐3, 151‐178
2.
Takahashi, T. (1978). “Mechanical chracteristics of debris flow.” J. Hydr. Div., ASCE, 104(8), 1153–1169.
3.
Takahashi, T. (1980). “Debris flow on prismatic open channel.” J. Hydr. Div., ASCE, 106(3), 381–396.
4.
Takahashi, T. (1983). “Debris flow and debris flow deposition.” Advances in the mechanics of granular materials, M. Shahinpoor, ed., Trans Tech Publications, Clausthal‐Zellerfeld, Germany, 2, 699–718.
5.
Takahashi, T. (1991). “Debris flow.” Monograph Series of IAHR, A. A. Balkema, Rotterdam, The Netherlands, 165.
6.
Takahashi, T. and Nakagawa, H. (1987). “Hazard zone mapping in respect to the damage to wooden houses due to breaking of levee.” Bulletin, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, 37‐2, 59–90.
7.
Takahashi, T., and Nakagawa, H. (1989). “Debris flow hazard zone mapping.” Proc. Japan‐China (Taipei) Joint Seminar on Natural Hazard Mitigation, Kyoto, Japan, 363–372.
Information & Authors
Information
Published In
Copyright
Copyright © 1992 ASCE.
History
Published online: Nov 1, 1992
Published in print: Nov 1992
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.