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- Fabrice Ardhuin, Eleonore Stutzmann, Martin Schimmel, Anne Mangeney
- 2011

[1] Noise with periods 3 to 10 s, ubiquitous in seismic records, is expected to be mostly generated by pairs of ocean wave trains of opposing propagation directions with half the seismic frequency. Here we present the first comprehensive numerical model of microseismic generation by random ocean waves, including ocean wave reflections. Synthetic and… (More)

- ANNE MANGENEY, PHILIPPE HEINRICH, ROGER ROCHE, Anne Mangeney

—We present here the analytical solution of a one-dimensional dam-break problem over inclined planes. This solution is used to test a numerical model developed for debris avalanches. We consider a dam with infinite length in one direction where material is released from rest at the initial instant. We solve analytically and numerically the depth-averaged… (More)

- Enrique Domingo Fernández-Nieto, François Bouchut, Didier Bresch, Manuel Jesús Castro Díaz, Anne Mangeney
- J. Comput. Physics
- 2008

In this paper we present a new two-layer model of Savage-Hutter type to study submarine avalanches. A layer composed of fluidized granular material is assumed to flow within an upper layer composed of an inviscid fluid (e. g. water). The model is derived in a system of local coordinates following a non-erodible bottom and takes into account its curvature.… (More)

We study a depth-averaged model of gravity-driven flows made of solid grains and fluid, moving over variable basal surface. In particular, we are interested in applications to geophysical flows such as avalanches and debris flows, which typically contain both solid material and interstitial fluid. The model system consists of mass and momentum balance… (More)

- Marina Pirulli, Marie-Odile Bristeau, Anne Mangeney, Claudio Scavia
- Environmental Modelling and Software
- 2007

In the framework of a better territory risk assessment and decision making, numerical simulation can provide a useful tool for investigating the propagation phase of phenomena involving granular material, like rock avalanches, when realistic geological contexts are considered. Among continuum mechanics models, the numerical model SHWCIN uses the depth… (More)

Keywords: Granular collapse Viscoplastic rheology Drucker–Prager plasticity Yield stress Variable viscosity Augmented Lagrangian a b s t r a c t A mechanical and numerical model of dry granular flows is proposed that quantitatively reproduce laboratory experiments of granular column collapse over inclined planes. The rheological parameters are directly… (More)

Observed avalanche flows of dense granular material have the property to present two possible behaviours: static (solid) or flowing (fluid). In such situation, an important challenge is to describe mathematically the evolution of the physical interface between the two phases. In this work we derive analytically a set of equations that is able to manage the… (More)

- Antoine Lucas, Anne Mangeney, Daniel Mège, François Bouchut
- 2011

[1] Landslides dynamics prediction remains difficult in spite of a considerable number of studies. The runout distance is widely used in analysis of landslide dynamics and in the calibration of the rheological parameters involved in numerical modeling. However, the unknown impact of the significant uncertainty in the shape of the initial released mass on… (More)

Numerical simulation of the collapse of granular material over an horizontal plane using both continuum and discrete element approach shows that continuum models based on the Long Wave Approximation (LWA) overestimate the driving forces involved during the collapse. This effect increases when the aspect ratio of the granular mass increases. Comparison… (More)

We introduce a simplified model for thin-layer flows of granular materials with yield. The model is based on a viscoplastic rheology with Drucker-Prager yield stress and describes the dynamics of the velocity profile as well as the transition between static and flowing material. As opposed to most models developed to describe the static/flowing transition… (More)