Large and very large scale motions in open-channel flows over rough bed in the presence and absence of a mixing layer

B Cerino, A Zampiron, S Proust, C Berni… - Environmental Fluid …, 2024 - Springer
This study examines shallow uniform flow and spanwise-sheared flow behind a vertical
splitter plate over a uniformly rough bed. The primary objective is to assess the presence of …

Characteristics of very large-scale motions in rough-bed open-channel flows

Y Shen, S Yang, J Liu - Water, 2023 - mdpi.com
Rough-bed open-channel flows (OCFs) are ubiquitous in rivers and canals. However, the
scaling and energy contents of very-large-scale motions (VLSMs) in such flows remain …

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

F Bagherimiyab, U Lemmin - Journal of Hydraulic Research, 2018 - Taylor & Francis
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 …

Very-large-scale motions in rough-bed open-channel flow

SM Cameron, VI Nikora, MT Stewart - Journal of Fluid Mechanics, 2017 - cambridge.org
Long-duration particle image velocimetry measurements in rough-bed open-channel flows
(OCFs) reveal that the pre-multiplied spectra of the streamwise velocity have a bimodal …

[PDF][PDF] Large and very large scale motions in roughbed open-channel flow

S Cameron, V Nikora, M Stewart… - E3S Web of …, 2018 - aura.abdn.ac.uk
Long duration PIV measurements in rough-bed (glass beads) open-channel flow (OCF)
reveal that the pre-multiplied spectra of the streamwise velocity has a bimodal distribution …

Lateral bed-roughness variation in shallow open-channel flow with very low submergence

Y Akutina, O Eiff, FY Moulin, M Rouzes - Environmental Fluid Mechanics, 2019 - Springer
Quantifying turbulent fluxes and secondary structures in shallow channel flows is important
for predicting momentum and mass transfer in rivers as well as channel capacity and …

Characteristics of large-scale coherent structures on irregularly arranged rough-bed open-channel flows

Y Wang, P Zhang, S Yang, C Hu, J Jin, R Zhang - Water, 2023 - mdpi.com
Large-scale coherent structures (LSCSs) in rough-bed open-channel flow (OCF) are
significant in turbulence research. A recent breakthrough is the bimodal feature of LSCSs on …

On the scaling of large-scale structures in smooth-bed turbulent open-channel flows

C Peruzzi, D Poggi, L Ridolfi, C Manes - Journal of Fluid Mechanics, 2020 - cambridge.org
This paper investigates the existence and scaling of the so-called large-scale and very-large-
scale motions (LSMs and VLSMs) in non-uniform turbulent open-channel flows developing …

Response of open-channel flow to a sudden change from smooth to rough bed

V Rathore, N Penna, S Dey, R Gaudio - Environmental Fluid Mechanics, 2022 - Springer
The turbulence characteristics in open-channel flow owing to a sudden change from smooth
(upstream) to rough (downstream) bed are investigated experimentally using a Particle …

An experimental investigation of turbulent free-surface flows over a steep permeable bed

G Rousseau, C Ancey - Journal of Fluid Mechanics, 2022 - cambridge.org
Steep streams involve shallow, supercritical turbulent flows over a permeable bed made up
of coarse particles. They usually exhibit higher flow resistance and stronger mass and …