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(Article of periodic en Anglais - 2010)

Document title

Hydraulic, physical and rheological characteristics of rain-triggered lahars at Semeru volcano, Indonesia

Authors(s) and Affiliation(s)

DUMAISNIL C. (1) ; THOURET J.-C. (1) ; CHAMBON G. (2) ; DOYLE E.E. (3) ; CRONIN S.J. (3) ; SURONO (4) ;
(1) Lab. Magmas et Volcans UMR 6524 CNRS, Univ. Blaise Pascal, OPGC et IRD, Clermont-Ferrand, FRANCE
(2) Cemagref, UR ETGR, St-Martin-d'Hères, FRANCE
(3) Volcanic Risk Solutions, Inst. of Natural Resources, Massey Univ., Palmerston North, NOUVELLE-ZELANDE
(4) Centre for Volcanology and Geological Hazard Mitigation (CVGHM), Bandung, INDONESIE

Abstract

In situ samples were taken from lahars in motion at 2 sites in the Curah Lengkong River, on the southeast flank of Semeru, providing estimates of the particle concentration, grain size spectrum, grain density and composition. This enables to identify flow sediment from 3 categories of lahars: (a) hyperconcentrated flow, (b) non-cohesive, clast- and matrix-supported debris flow, and (c) muddy flood. Rheometrical tests on materials sampled from moving hyperconcentrated flows were carried out using a laboratory vane rheometer. Results suggest a purely frictional behaviour. Importantly, and contrary to previous experiments conducted with monodisperse suspensions, these results do not show any transition towards a viscous behaviour for high shear rates. These data provide important constraints for future physical and numerical modelling of lahar flows

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2010, vol. 35, no13 [pp. 1573-1590]

Bibliographic references : 1,5 p.

Collation : 16 fig., 5 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2003

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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