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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Modelling a cohesive-frictional debris flow: an experimental, theoretical, and field-based study

Auteur(s) et Affiliation(s)

DE BLASIO, F.V.
Dep. of Geosciences, Univ., Oslo, Norvege
BREIEN, H.
Dep. of Geosciences, Univ., Oslo, Norvege
International Center for Geohazards (ICG), Oslo, Norvege
ELVERHØI, A.
Dep. of Geosciences, Univ., Oslo, Norvege
International Center for Geohazards (ICG), Oslo, Norvege


Description :
The AA. present a coupled rheological-numerical model to characterize the debris flows in which cohesive and frictional materials are both present. As a first step, they consider small-scale artificial debris flows in a flume with variable percentages of clay versus sand, and measure separately the rheological properties of sand–clay mixtures. A comparison with the predictions of a modified version of the numerical model BING shows a reasonable agreement between measurements and simulations. As application to a field case, the AA. analyse a recent debris flow that occurred in Fjærland (Western Norway), caused by a glacial lake outburst flood (GLOF) originating from the failure of a moraine ridge. In contrast to the laboratory debris flows, the presence of large boulders and the higher normal pressure inside the natural debris flow requires the introduction of a novel rheological model that distinguishes between mud-to–clast supported material.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 6, p. 753-766, nombre de pages : 14, Références bibliographiques : 23 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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