1 min in the life of a river: selecting the optimal record length for the measurement of turbulence in fluvial boundary layers

Buffin‐Bélanger, Thomas; Roy, Alain

doi:10.1016/j.geomorph.2004.09.032

Cited by 118 publications

(78 citation statements)

References 59 publications

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“…However, few field investigations in natural or canalized rivers have been made. Recent work on fluvial hydraulics, including field studies, was summarized by [11]. These authors classified the contributions by type of analysis and by topic (flow structure, velocity profiles, microhabitats and numerical model validation).…”

Section: Introductionmentioning

confidence: 99%

Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows

Franca

Ferreira²,

Lemmin

2008

Advances in Water Resources

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a b s t r a c tThe logarithmic layer of double-averaged (in time and space) streamwise velocity profiles obtained from field measurements made in the Swiss rivers, Venoge and Chamberonne is parameterized and discussed. Velocity measurements were made using a 3D Acoustic Doppler Velocity Profiler. Both riverbeds are hydraulically rough, composed of coarse gravel, with relative submergences (h/D 50 ) of 5.25 and 5.96, respectively. From the observations, the flow may be divided into three different layers: a roughness layer near the bed, an equivalent logarithmic layer and a surface or outer layer. It was found that a logarithmic law can describe the double-averaged profiles in the layer 0.30 < z/h < 0.75. The parameterization of the logarithmic law is discussed. Special emphasis is given to the geometric parameters roughness and zerodisplacement heights and to the equivalent von Karman constant.

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Section: Introductionmentioning

confidence: 99%

Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows

Franca

Ferreira²,

Lemmin

2008

Advances in Water Resources

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“…A total of 584 velocity time series were measured within the 80-m-long reach in which the fish were observed. Velocity time series were recorded over at least 1 min, as recommended by Buffin-Bélanger and Roy (2005) for similar data. Flow was sampled 10 cm above the riverbed on the nodes of a 2-m 3 2-m grid within the river reach.…”

Section: Methodsmentioning

confidence: 99%

Habitat Choice by Atlantic Salmon Parr in Relation to Turbulence at a Reach Scale

Enders

Roy

Ovidio

et al. 2009

N American J Fish Manag

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Abstract.-The variables commonly used to describe the physical habitat of Atlantic salmon Salmo salar parr are average velocity, water depth, and substrate. A variety of micro-and mesohabitat models have been developed using these variables to assess habitat quality. However, Atlantic salmon parr live in highly turbulent streams and rivers in which intense fluctuations of water velocity occur. Laboratory experiments have shown that turbulence affects the behavior and energetics of fish. Nevertheless, habitat use in relation to the strong temporal variability of velocity in natural environments has rarely been studied. In this study, Atlantic salmon parr habitat was examined in relation to turbulence in the Patapédia River, Quebec. Rather than taking the usual approach of surveying a large population at one point in time, we used an intensive radiotelemetry tracking survey that focused on the habitat use of a few individual fish over an extended period. We analyzed habitat use in relation to several dynamic hydraulic variables. Our results revealed that under naturally turbulent conditions, the parr displayed high individual variability in their habitat use. Such heterogeneous use of habitat suggests that individuals are not constrained to a single habitat type. Furthermore, no differences were observed in habitat use among the four daily periods (dawn, day, dusk, and night) for individual parr.

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“…We recorded the instantaneous streamwise (u), spanwise (v), and vertical (w) velocities using a SonTek microADV 16 MHz down-looking probe type with a sampling frequency (fs) of 50 Hz. The sampling time (ts) was 100 s, as recommended by Buffin-Bélanger and Roy 9) . This data used to calculate the spatially averaging mean velocity and turbulence properties (TKE and Reynolds shear stress).…”

Section: D84 D84 D84mentioning

confidence: 99%

The Effects of Sediment Supply on Hydraulic Characteristics of Flow Over the Imbricated Cobbles

2016

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Sediment flushing operation from large dam causes bed condition change in the downstream. It may reduce the flow resistance as the flushed sediment fills the voids among the large stones. This condition influences the flow in roughness layer which is important habitat not only for benthos, but also for swimming fishes. However, the hydraulic condition changes in roughness layer due to sediment supply is not well investigated. Furthermore, its impact to habitat is not considered neither. In this study, we investigated the hydraulic characteristics changes within the roughness layer due to bed topography changes as one of the impacts from sediment supply in natural rivers. It was conducted over immobile bed condition in experimental flume. Detail velocity measurement results within the roughness layer and the turbulence properties are presented. Besides that, suitable method to evaluate the roughness height as the bed condition changing is also discussed. The results exhibited the reducing of spatial variance of spatially averaged mean velocity, TKE, and Reynolds shear stress within the roughness layer associated with decreasing of bed roughness as the sediment fills the voids among cobbles. We also observed the decreasing of roughness layer thickness as the bed roughness reduced. This experiment helps to explain that sediment supply is not only reducing flow resistance but also limits habitat preference of benthos and swimming fishes as velocity distribution becomes homogenous within the roughness layer.

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1 min in the life of a river: selecting the optimal record length for the measurement of turbulence in fluvial boundary layers

Cited by 118 publications

References 59 publications

Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows

Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows

Habitat Choice by Atlantic Salmon Parr in Relation to Turbulence at a Reach Scale

The Effects of Sediment Supply on Hydraulic Characteristics of Flow Over the Imbricated Cobbles

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