Publications de Fereshteh Bagherimiyab Hunkeler

Large-scale coherent flow structures in rough-bed open-channel flow observed in fluctuations of three-dimensional velocity, skin friction and bed pressure

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

The dynamics of large-scale coherent structures (LSCS) are investigated in a rough-bed flow over the whole water column and longitudinal and transverse turbulent fluxes of momentum are compared. The relation between LSCS and fluctuations of skin friction a ...

Taylor & Francis Ltd2018

Ripple formation and sediment-suspension events in unsteady depth-varying open-channel flow

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

The development of ripples and its effects on suspended sediment during unsteady flow was studied experimentally to understand and quantify the processes during floods. Quasi-instantaneous profiles of velocity and sediment concentration were taken simultan ...

Crc Press-Taylor & Francis Group2014

Shear velocity estimates in rough-bed open-channel flow

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

Shear velocity u(*) is an important parameter in geophysical flows, in particular with respect to sediment transport dynamics. In this study, we investigate the feasibility of applying five standard methods [the logarithmic mean velocity profile, the Reyno ...

Wiley-Blackwell2013

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed

Fereshteh Bagherimiyab Hunkeler

Even though flow in natural rivers and channels is generally unsteady, only a few studies on turbulent structures in unsteady open-channel flows have been carried out. In hydraulic engineering problems, unsteady flow is often approximated with concepts of ...

EPFL2012

Fine sediment dynamics in unsteady open-channel flow studied with acoustic and optical systems

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

In order to simulate fine sediment dynamics over an armored bed in a tidal river, unsteady accelerating, then steady open-channel flow over a movable (but not moving) coarse gravel bed (D-50=5.5 mm) was studied. A layer of fine sediment (D-50=120 mu m) was ...

Elsevier2012

Spatially varied flow impact on resistance in corrugated pipes

Fereshteh Bagherimiyab Hunkeler

The roughness coefficient is a significant factor in hydraulic design process, but carries vast uncertainty in practice. This paper reports the resistance coefficients of corrugated PVC pipes under different flow regimes (i.e. pressurised, gradually varied ...

2011

Improving the accuracy of four-receiver acoustic Doppler velocimeter (ADV) measurements in turbulent boundary layer flows

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

Acoustic Doppler instrument measurements suffer from random spikes and Doppler noise. Using a four-receiver ADV (acoustic Doppler velocimeter; Vectrino manufactured by Nortek) that allows recording beam velocities, we combine a spike-removal procedure on t ...

Association for the Sciences of Limnology and Oceanography (ASLO)2010

Fereshteh Bagherimiyab Hunkeler

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Large-scale coherent flow structures in rough-bed open-channel flow observed in fluctuations of three-dimensional velocity, skin friction and bed pressure

Ripple formation and sediment-suspension events in unsteady depth-varying open-channel flow

Shear velocity estimates in rough-bed open-channel flow

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed

Fine sediment dynamics in unsteady open-channel flow studied with acoustic and optical systems

Spatially varied flow impact on resistance in corrugated pipes

Improving the accuracy of four-receiver acoustic Doppler velocimeter (ADV) measurements in turbulent boundary layer flows

Experimental study on fine sediment resuspension in accelerating rough-bed open-channel flow

Velocity and Turbulence Distribution in Unsteady Rough-Bed Open-Channel Flow

A Study of Bottom Boundary Layer Dynamics in Unsteady Sediment-Laden Open-Channel Flow Using Acoustic Profiling

Shear velocity estimates in rough-bed open-channel flow

Fine sediment dynamics in unsteady open-channel flow studied with acoustic and optical systems

Spatially varied flow impact on resistance in corrugated pipes

Improving the accuracy of four-receiver acoustic Doppler velocimeter (ADV) measurements in turbulent boundary layer flows

Experimental study on fine sediment resuspension in accelerating rough-bed open-channel flow

Velocity and Turbulence Distribution in Unsteady Rough-Bed Open-Channel Flow

A Study of Bottom Boundary Layer Dynamics in Unsteady Sediment-Laden Open-Channel Flow Using Acoustic Profiling

Large-scale coherent flow structures in rough-bed open-channel flow observed in fluctuations of three-dimensional velocity, skin friction and bed pressure

Ripple formation and sediment-suspension events in unsteady depth-varying open-channel flow

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed