A5006984588- Hydrology and Sediment Transport Processes
- Coastal and Marine Dynamics
- Soil erosion and sediment transport
- Geological formations and processes
- Hydraulic flow and structures
- Underwater Acoustics Research
- Landslides and related hazards
- Aeolian processes and effects
- Coastal wetland ecosystem dynamics
- Geophysical Methods and Applications
- Fluid Dynamics and Turbulent Flows
- Conferences and Exhibitions Management
- Hydrology and Watershed Management Studies
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Aquatic and Environmental Studies
- Geotechnical Engineering and Underground Structures
- Flood Risk Assessment and Management
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Climate Change Communication and Perception
- Marine and environmental studies
- Fish Ecology and Management Studies
- Water Systems and Optimization
- Plant Water Relations and Carbon Dynamics
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2019-2025
Forum Réfugiés - Cosi
2021-2025
Communauté urbaine de Lyon
2014-2019
Laboratoire des Écoulements Géophysiques et Industriels
2009-2017
Centre National de la Recherche Scientifique
2009-2017
Université Grenoble Alpes
2010-2017
Université Joseph Fourier
2008-2012
Abstract A mixing layer (ML) forms when two streams of different speeds or densities merge. MLs are ubiquitous in nature and can be often observed the atmosphere, ocean, rivers, canals, lakes reservoirs. This review paper focuses on turbulent developing open-channel flows vertical size ML is smaller than its streamwise spanwise dimensions. Such referred to as shallow (SMLs). The SMLs involve large-scale features such quasi-two-dimensional coherent structures with a bed-normal axis,...
This study describes a laboratory experiment on rip current circulations over moveable bed. Rip characteristics eight contrasting nature‐like beach morphologies are investigated. The seabed varied from reasonably alongshore uniform to strongly nonuniform with crescentic patterns and bar‐rip morphologies, representative of full morphological down‐state sequence. same offshore shore‐normal waves were generated by the wavemaker for situations mean water level sensitivity as function morphology...
An experimental study on a physical model of beach in two‐dimensional wave flume was designed to investigate velocity nonlinearities the boundary layer. The cross‐shore measured surf zone along vertical profile every 3mm from free‐stream elevation down still bed level. skewness and asymmetry phase averaged were computed at each elevation. Observations indicate that transforms into bottom skewness. A linear relation between ratio is established. theoretical relationship discussed, which...
Abstract A reliable estimation of sediment transport in gravel‐bed streams is important for various practical engineering and biological studies (e.g., channel stability design, bed degradation/aggradation, restoration spawning habitat). In the present work, we report original laboratory experiments investigating gravel particles at low shear stresses. The tests were conducted under unsteady flow conditions inducing stresses, with detailed monitoring topography using a laser scanner. Effects...
A growing portion of scientists realises the need to not only alert about climate change, but also change their professional practices. range tools have emerged promote more sustainable activities, yet many struggle go beyond simple awareness-raising create concrete transition actions. Here we propose a game-based support system MaTerre180’ , which has been designed build scenarios greenhouse gas (GHG) emission reductions in academic community. After providing common scientific background...
Our data show large scatter in the critical Shields stress values for initial sediment motion. The main sources of dispersion are related to methodological procedures defining inception movement (i.e., visual observations or extrapolation transport rate) and estimation bed shear stress. threshold motion varies with many factors not only grain size but also composition (e.g., presence fine sediments a coarse matrix), arrangement roughness, orientation, characteristic lengths structures)...
Abstract Fine sediment infiltration into a river bed is physical process affected by different human actions and has several environmental, socioeconomic, morphology consequences. A theoretical model proposed herein aiming to reproduce the fine content depth profile resulting from of an initially clean gravel bed. The based on probability infiltrating particles be trapped in pore throat formed three particles. tested against previous experimental results found adequately occurrence two...
Shallow mixing layers (SMLs) behind a splitter plate were studied in tilted rectangular open-channel flume for range of flow depths and the initial shear parameter ${\lambda = (U_{2}-U_{1})/(U_{2}+U_{1})}$ , where $U_1$ $U_2$ are streamwise velocities slow fast streams, respectively. The main focus study is on (i) key parameters controlling time-averaged SMLs; (ii) emergence spatial development Kelvin–Helmholtz coherent structures (KHCSs) large- very-large-scale motions (LSMs VLSMs)...
We report on new experiments designed to investigate bed destabilization processes in a two-dimensional wave flume physical model of beach. The mobile consists non-cohesive granular material low density. conditions are provided by repeating cycle waves made two bichromatic groups different period. horizontal and vertical velocities acoustically profiled vertically from free-stream elevation down the still level surf zone. Additional measurements fluid pressure at positions closely aligned...
Abstract Bedload transport is a complex phenomenon that not well understood, especially for poorly sorted sediment and low rates, which what typically found in alpine gravel‐bed rivers. In this paper, the interaction between bedload rate, bed stability flow investigated using flume experiments. Significant differences rates were observed experiments conducted on beds formed with same gravel material but presenting diverse arrangements bedforms. Tests performed under regimes of are mainly...
A large collection of laboratory measurements piezometric head (h) and discharge (Q) were made over hydraulic models a tilting weir at nine different angles, ranging from 25.7° to 90° within 0.3-m-wide flume. These corroborated with additional data taken 1-m-wide flume across four inclination angles. The range both angle (θ) flow scale examined in this study elucidate the nature head-discharge rating equation beyond previous work. Results show that as θ decreases under constant Q, h...
Experiments have been performed in a large wave tank order to study the morphodynamics of rip current systems. Both accretive and erosive shore‐normal conditions were applied, beach evolving through all states within intermediate classification, under so‐called down‐state (accretive) up‐state (erosive) morphological transitions. Results show that any prescribed change drastically increases rate at which morphology changes. The surf zone tends toward steady state when running given climate...
Abstract In the last decade, much progress has been made in continuously measuring suspended sediment concentration (SSC) rivers using horizontal side‐looking Acoustic Doppler Current Profilers. However, these techniques do not provide information on spatial variability of suspension. this study, we explore some new possibilities offered by down‐looking deployment a multifrequency acoustic backscatter system (ABS) order to obtain suspension throughout an entire river cross section. Two...
Flood hazards (flow depth and velocity) must be accurately assessed in high-risk areas during extreme flood events. However, the prediction of very high flows is not an easy task due to lack field data strong link between flow resistance land occupation floodplain. Confinement inhomogeneity lateral longitudinal directions hydraulic roughness strongly vary with return period T. The physical processes are complex, some still largely unexplored, assumptions linked numerical modelling cannot...
Abstract Measurements of velocity profiles, sediment concentration, pore-pressure and sheet flow layer dynamics are analysed in order to better assess the relative importance processes that contribute destabilise bed a sandy beach. These measurements were conducted surf zone irregular waves, 30 m × wave tank. The effects acceleration, excess vertical gradients across infiltration/exfiltration seepage studied. appearance is apparently initiated by strong accelerations fronts. results compared...
Abstract The hydroacoustic monitoring of suspended sediment concentration (SSC) in rivers is based on the inversion backscatter and attenuation models. To evaluate such models, acoustic were measured from a homogeneous suspension fine river sediments (clay) laboratory tank at various concentrations range 1–18 g/l. Agreement between modeled values was found to be relatively poor. results are highly sensitive particle size shape which come with large measurement uncertainties they can...
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