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General Information
Editor-in-chief
Prof. T. Hikmet Karakoc
Anadolu University, Faculty of Aeronautics and Astronautics, Turkey

IJET 2015 Vol.7(3): 204-208 ISSN: 1793-8236
DOI: 10.7763/IJET.2015.V7.792

Natural Hazards Modeling: From Runoff to Hyperconcentrated Flows – Roll Waves Generation

Fabiana de O. Ferreira, Geraldo de F. Maciel, Guilherme H. Fiorot, and Evandro F. da Cunha
Abstract—The aim of this article is to contribute to determination of generation criteria for roll waves in mud flows. Flow is represented byCauchy’s equations system (general mass and momentum conservation equations), wherenon-Newtonian rheology (mud materials) is inserted and shallow water conditions are imposed, then leading to aroll waves model for laminar non-Newtonian viscous flow. Linear stability analysis is then applied and two criteria are established for roll waves generation: one related to Froude number and another by means of disturbance frequency. Confrontation of these criteria to numerical results is observed and good agreement is found regarding amplitude, length and propagation speed of roll waves. For Newtonian fluids, waves profile is also compared to experimental results. Preliminaries results based on non-Newtonian fluids experiments from literature are explored.

Index Terms—Mudflows, non-newtonian fluid, risks, roll waves.

F. O. Ferreira and E. F. Cunha are with Faculdade de Engenharia De Ilha Solteira, FEIS/UNESP, Brazil (e-mail: fabiana.of@gmail.com, evandrofernandesc@gmail.com).
G. F. Macielis is with the Civil Engineering Department from Faculdade de Engenharia de Ilha Solteira, FEIS/UNESP, Brazil (e-mail: maciel@dec.feis.unesp.br).
G. H. Fiorot is with the Laboratoire de Génie Civil et Génie Mécanique, Institut National des Sciences Appliquées de Rennes, LGCGM/INSA, France (e-mail: gfiorot@insa-rennes.fr).

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Cite: Fabiana de O. Ferreira, Geraldo de F. Maciel, Guilherme H. Fiorot, and Evandro F. da Cunha, "Natural Hazards Modeling: From Runoff to Hyperconcentrated Flows – Roll Waves Generation," International Journal of Engineering and Technology vol. 7, no. 3, pp. 204-208, 2015.

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