Concept
Dune
Related publications (32)
Insights Into the Dynamics of Vegetated Alternate Bars by Means of Flume Experiments
Alternate bars are bedforms recognizable in straight or weakly curved channels as a result of riverbed instability. The length and height of alternate bars scale with the river width and the water depth, respectively. During low water stages, alternate bar ...
2023Do Antidune Trains Undergo Morphological Changes When These Bedforms Migrate Upstream?
Upstream migrating antidunes develop in streams under supercritical flow conditions. These bedforms are often organised in trains (i.e. sequences of well-developed antidunes). In shallow flows over coarse sediments, the dynamics of a single antidune can be ...
IAHR International Association for Hydro-Environment Engineering and Research2022Flushing the Lake Littoral Region: The Interaction of Differential Cooling and Mild Winds
Damien Bouffard, Hugo Nicolás Ulloa Sánchez, Tomy Doda, Cintia Luz Ramon Casanas
The interaction of a uniform cooling rate at the lake surface with sloping bathymetry efficiently drives cross-shore water exchanges between the shallow littoral and deep interior regions. The faster cooling rate of the shallows results in the formation of ...
AMER GEOPHYSICAL UNION2022Experimental Study on Bedload Transport and Bedforms: Behaviour and Interplay in Steep Turbulent Streams
In mountain regions, steep streams play an important role in water and sediment connectivity. In these highly dynamic systems, water flow features, sediment fluxes and stream morphologies are tightly interlinked over a broad range of temporal and spatial s ...
EPFL2022Mechanical performance and upscaling of bio-improved soils
Ecological awareness, pressing climate considerations and rising need for soil stabilization push forward the quest for alternative solutions in geotechnical engineering such as Microbially Induced Carbonate Precipitation (MICP). Precipitated crystals serv ...
EPFL2022The variability of antidune morphodynamics on steep slopes
Steep streams on rough beds are generally characterised by supercritical flow conditions under which antidunes can develop and migrate over time. In this paper, we present flume experiments that we conducted to investigate the variability of antidune geome ...
2021Density-dependent solute transport in a layered hyporheic zone
David Andrew Barry, Mohsen Cheraghi, Qihao Jiang, Jing Xu
Hyporheic exchange is affected by bedform geometry, which induces complex flow paths within the bedform. Additional factors that influence flow and solute transport in the hyporheic zone are layered profile sediments and density-driven flow. This study exp ...
ELSEVIER SCI LTD2020Understanding snow bedform formation by adding sintering to a cellular automata model
Varun Sharma, Michael Lehning, Louise Braud
Cellular-automata-based modelling for simulating snow bedforms and snow deposition is introduced in this study. The well-known ReSCAL model, previously used for sand bedforms, is adapted for this purpose by implementing a simple sintering mechanism. The ef ...
Copernicus GmbH2019Antidunes on steep slopes: variability of wave geometry and migration celerity
As a result of interactions between streamflow andsediment, riverbeds are seldom smooth, but depending onhydraulic and sediment transport conditions, they exhibitbedforms, which grow and migrate over time (upstreamor downstream). Morphology migration may e ...
Heide Friedrich and Karin Bryan2019Cohesion-Induced Enhancement of Aeolian Saltation
Michael Lehning, Johan Alexandre Philippe Gaume, Francesco Comola
The wind-driven saltation of granular material plays a key role in various geophysical processes on Earth, Mars, Venus, and Titan. Although interparticle cohesion is known to limit the number of grains lifted from the surface through aerodynamic entrainmen ...
AMER GEOPHYSICAL UNION2019