Publications related to Bed load transport over a broad range of timescales: Determination of three regimes of fluctuations

A birth-death-migration model for life in astrophysical environments

To assess the number of life-bearing worlds in astrophysical environments, it is necessary to take the intertwined processes of abiogenesis (birth), extinction (death), and transfer of life (migration) into account. We construct a mathematical model that i ...

OXFORD UNIV PRESS2021

Stochastic bedload transport in mountain streams

Christophe Ancey

Describing bedload transport as a stochastic process is an idea that emerged in the 1930s with the pioneering work of Einstein. For a long time, the stochastic approach attracted marginal attention, but the situation has radically changed over the last dec ...

EDP Sciences2018

The stochastic heat equation: hitting probabilities and the probability density function of the supremum via Malliavin calculus

Fei Pu

In this thesis, we study systems of linear and/or non-linear stochastic heat equations and fractional heat equations in spatial dimension

1

driven by space-time white noise. The main topic is the study of hitting probabilities for the solutions to these ...

EPFL2018

Entrainment,motion, and deposition of coarse particles transported by water over a sloping mobile bed

Christophe Ancey, Joris Heyman

In gravel bed rivers, bed load transport exhibits considerable variability in time and space. Recently, stochastic bed load transport theories have been developed to address the mechanisms and effects of bed load transport fluctuations. Stochastic models i ...

Wiley-Blackwell2016

Sediment transport in mountain rivers

Christophe Ancey, Eric Bardou

The paper reviews our recent attempts at modelling bed load transport in mountain rivers. This is a longstanding issue that has attracted considerable attention over the last century. While a number of field and laboratory studies have been instrumental in ...

2014

A microstructural approach to bed load transport: mean behaviour and fluctuations of particle transport rates

Christophe Ancey, Joris Heyman

This paper concerns a model of bed load transport, which describes the advection and dispersion of coarse particles carried by a turbulent water stream. The challenge is to develop a microstructural approach that, on the one hand, yields a parsimonious des ...

Cambridge University Press2014

Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer

Ivo Furno, Paolo Ricci, Federico David Halpern

The turbulence observed in the scrape-off-layer of a tokamak is often characterized by intermittent events of bursty nature, a feature which raises concerns about the prediction of heat loads on the physical boundaries of the device. It appears thus necess ...

2014

A study of the spatio-temporal behaviour of bed load transport rate fluctuations

Joris Heyman

This thesis addresses the problem of a statistical description of the transport of sediment as bed load. It highlights the role of fluctuations arising during the transport process, and their impact on macroscopic averages. The results presented here are b ...

EPFL2014

Tracking bed load particles in a steep flume: Methods and results.

Christophe Ancey, Joris Heyman

In this paper, we present an experimental study about the motion of bed load particles in water. Recent developments in the stochastic theory of bed load transport call for precise experimental data to validate the models. We set up the experiment in a til ...

CRC Press / Balkema - Taylor & Francis Group2014

Statistics of bedload transport over steep slopes: Separation of time scales and collective motion

Christophe Ancey, Joris Heyman, François Mettra, Hongbo Ma

Steep slope streams show large fluctuations of sediment discharge across several time scales. These fluctuations may be inherent to the internal dynamics of the sediment transport process. A probabilistic framework thus seems appropriate to analyze such a ...

American Geophysical Union2013

Bed load transport over a broad range of timescales: Determination of three regimes of fluctuations

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A birth-death-migration model for life in astrophysical environments

Stochastic bedload transport in mountain streams

The stochastic heat equation: hitting probabilities and the probability density function of the supremum via Malliavin calculus

Entrainment,motion, and deposition of coarse particles transported by water over a sloping mobile bed

Sediment transport in mountain rivers

A microstructural approach to bed load transport: mean behaviour and fluctuations of particle transport rates

Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer

A study of the spatio-temporal behaviour of bed load transport rate fluctuations

Tracking bed load particles in a steep flume: Methods and results.

Statistics of bedload transport over steep slopes: Separation of time scales and collective motion

Stochastic bedload transport in mountain streams

Statistics of bedload transport over steep slopes: Separation of time scales and collective motion

A study of the spatio-temporal behaviour of bed load transport rate fluctuations

A birth-death-migration model for life in astrophysical environments

The stochastic heat equation: hitting probabilities and the probability density function of the supremum via Malliavin calculus

Entrainment,motion, and deposition of coarse particles transported by water over a sloping mobile bed

A microstructural approach to bed load transport: mean behaviour and fluctuations of particle transport rates

Tracking bed load particles in a steep flume: Methods and results.

Sediment transport in mountain rivers

Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer