Call number:
ZSP-201-94/5
In:
CRREL Report, 94-5
Description / Table of Contents:
A three-dimensional theory is derived to describe the temporal behavior of gravity currents of cohesionless granular media, in an attempt to model the motion of dense, flow-type snow avalanches, ice and rock slides. A mohr-Coulomb yield criterion is assumed to describe the constitutive behavior of the material, and the basal bed friction is described similarly by a Coulomb type of friction. A drag term is included in order to model the occurrence of flow regimes where boundary drag becomes non-negligible. Data from laboratory simulations are compared to a series of numerical studies based on the aforementioned theory. A nondimensional, depth and width averaged form of the theory is considered. A Lagrangian finite difference scheme is then applied to numerically model some limiting cases of the governing equations. Two different numerical models are developed, tested and compared to experimental values. The results indicate that the model can account for flow transitions by inclusion of the drag term when the initial inclination angle is large enough to affect boundary drag. Furthermore, the temporal and spatial evolution of the granulate and final runout position can be predicted to values well within the experimental error.
Type of Medium:
Series available for loan
Pages:
iv, 29 Seiten
,
Illustrationen
Series Statement:
CRREL Report 94-5
URL:
https://apps.dtic.mil/dtic/tr/fulltext/u2/a283989.pdf
URL:
https://hdl.handle.net/11681/9396
Language:
English
Note:
CONTENTS
Preface
Nomenclature
Introduction
Mathematical formulation
Limiting cases of the governing equations
Nondimensionalization scheme
Numerical solutions and comparison to experiments
Unconstrained Coulomb flow model with constant bed friction
Unconstrained Coulomb flow with boundary drag term
Conclusions and remarks
Literature cited
Abstract
Location:
AWI Archive
Branch Library:
AWI Library
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