Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model
TLDR
In this article, the authors describe a finite element code for debris flows developed to model the flow within a steep channel and the stopping conditions on the fan, which allows the systematic comparison of a wide variety of previously proposed one-phase flow resistance laws using the same finite element solution method.Abstract:
. This paper describes a one-dimensional finite element code for debris flows developed to model the flow within a steep channel and the stopping conditions on the fan. The code allows the systematic comparison of a wide variety of previously proposed one-phase flow resistance laws using the same finite element solution method. The one-dimensional depth-averaged equations of motion and the numerical model are explained. The model and implementation of the flow resistance relations was validated using published analytical results for the dam break case. Reasonable agreement for the front velocities and stopping location for a debris-flow event in the Kamikamihori torrent in Japan can be achieved with turbulent flow resistance relations including "stop" terms which allow the flow to come to rest on a gently sloping surface. While it is possible to match the overall bulk flow behavior using relatively simple flow resistance relations, they must be calibrated. A sensitivity analysis showed that the shape of the upstream input hydrograph does not much affect the flow conditions in the lower part of the flow path, whereas the event volume is much more important.read more
Citations
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References
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Journal ArticleDOI
The physics of debris flows
TL;DR: In this paper, a simple model that satisfies most of these criteria uses depth-averaged equations of motion patterned after those of the Savage-Hutter theory for gravity-driven flow of dry granular masses but generalized to include the effects of viscous pore fluid with varying pressure.
Journal ArticleDOI
A model for the runout analysis of rapid flow slides, debris flows, and avalanches
TL;DR: In this paper, runout analyses are used for risk assessment and design of remedial measures against rapid landslides such as debris flows, debris avalanches, rockslide avalanches and large-scale liquefaction failure.
Journal ArticleDOI
Flow of variably fluidized granular masses across three‐dimensional terrain: 1. Coulomb mixture theory
TL;DR: In this article, a depth-averaged, three-dimensional mathematical model that accounts explicitly for solid and fluid-phase forces and interactions was developed to predict motion of diverse grain-fluid masses from initiation to deposition.
Journal ArticleDOI
Two‐Dimensional Water Flood and Mudflow Simulation
TL;DR: FLO•2D as mentioned in this paper is a two-dimensional finite difference model that simulates clear-water flood hazards, mudflows, and debris flows on alluvial fans and urban floodplains.
Journal ArticleDOI
Empirical Relationships for Debris Flows
TL;DR: In this paper, an overview is given of empirical relationships that can be used to estimate the most important parameters of debris-flow behavior, including peak discharge, the mean flow velocity, the total travel distance, and the runout distance on the fan.