Comparing different methods of bed shear stress estimates in simple and complex flow fields

Biron, Pascale M.; Robson, C.; Lapointe, Martine-Emmanuelle; Gaskin, Susan

doi:10.1002/esp.1111

Cited by 271 publications

(254 citation statements)

References 38 publications

Supporting

Mentioning

207

Contrasting

Unclassified

Order By: Relevance

“…TKE profiles peak at around 0Á1z/h (Figure 4), as has previously been observed for less rough-bed conditions (Nicholas, 2001;Biron et al, 2004). Above the maximum, TKE profiles closely follow the Reynolds stress profiles in their linear form.…”

Section: Tke Methodssupporting

confidence: 81%

“…Nezu and Nakagawa (1993) suggested that the extrapolated Reynolds stress method gives the most reliable estimates. Biron et al (2004) and Rowinski et al (2005) used the Reynolds stress method as a reference to compare with results obtained by other methods. When results from other methods are plotted against those from the Reynolds stress method (Figure 8), no clear trend or tendency can be seen over the range investigated here.…”

Section: Discussionmentioning

confidence: 99%

“…Kim et al (2000) used the same methods as Rowinski et al (2005) and the spectral method in an estuary over a soft mud bottom and recommend further investigating the TKE method based on velocity measurements carried out at two levels. Biron et al (2004) performed laboratory experiments over fine sand, using the same methods and observed that the logarithmic profile methods gave shear velocity estimates that were significantly larger than the remaining methods. They suggest that single point measurements should be made at 0Á1 h, but above the roughness layer.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shear velocity estimates in rough‐bed open‐channel flow

Bagherimiyab

Lemmin

2013

Earth Surf Processes Landf

View full text Add to dashboard Cite

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 Reynolds stress profile, the turbulent kinetic energy (TKE) profile, the wall similarity and spectral methods] that were initially developed to estimate shear velocity in smooth bed flow to turbulent flow over a loose bed of coarse gravel (D 50 = 1Á5 cm) under sub-threshold conditions. The analysis is based on quasi-instantaneous three-dimensional (3D) full depth velocity profiles with high spatial and temporal resolution that were measured with an Acoustic Doppler Velocity Profiler (ADVP) in an open channel. The results of the analysis confirm the importance of detailed velocity profile measurements for the determination of shear velocity in rough-bed flows. Results from all methods fall into a range of AE 20% variability and no systematic trend between methods was observed. Local and temporal variation in the loose bed roughness may contribute to the variability of the logarithmic profile method results. Estimates obtained from the TKE and Reynolds stress methods reasonably agree. Most results from the wall similarity method are within 10% of those obtained by the TKE and Reynolds stress methods. The spectral method was difficult to use since the spectral energy of the vertical velocity component strongly increased with distance from the bed in the inner layer. This made the choice of the reference level problematic. Mean shear stress for all experiments follows a quadratic relationship with the mean velocity in the flow. The wall similarity method appears to be a promising tool for estimating shear velocity under rough-bed flow conditions and in field studies where other methods may be difficult to apply. This method allows for the determination of u * from a single point measurement at one level in the intermediate range (0Á3 < h < 0Á6).

show abstract

Section: Tke Methodssupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shear velocity estimates in rough‐bed open‐channel flow

Bagherimiyab

Lemmin

2013

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…Shear stress (s, in g cm À1 s À2 ) is a common variable used to characterize sediment transport and deposition (Biron et al 2004). It is possible to estimate bed shear stress (s 0 ) from the Reynolds stress…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Two common approaches to determine the friction velocity are (refer to detailed study by Biron et al [11]): (1) the measured Reynolds stress profile's extrapolation method; and (2) the energy gradient method. These approaches have been proven to reasonably calculate the friction velocity in different bed conditions [12,13], providing that the bed surface layer condition is relatively uniform through streamwise space.…”

Section: Friction Velocitymentioning

confidence: 99%

Velocity Distribution and 3D Turbulence Characteristic Analysis for Flow over Water-Worked Rough Bed

Wei

Huang

2017

Water

View full text Add to dashboard Cite

Abstract:To reproduce the natural flow topography in a laboratory environment, it is crucial to recapture its bed condition in order to ensure the accurate representation. Water-worked bed represents a state-of-the-art experimentally formed bed to imitate the natural-formed channel in most rivers or natural streams. Recently, this technique has been intensively studied through experimental and computational approaches; however, its actual influence towards the near-bed flow as compared to experimentally prepared rough bed in well-packed bedform order are still yet to be investigated deeply. This experimental study systematically investigated and compared the differences in velocity distribution and three-dimensional (3D) turbulence characteristics, including turbulence intensities and Reynolds stresses, between uniform smooth bed, laboratory-prepared rough bed and water-worked bed open channel flows. The flow comparisons were concentrated at near-bed region where clear flow behaviour change can be observed. Through these comparisons, the study inspected the characteristics of water-worked bedform thoroughly, in order to inform future experimental research that tries to reproduce natural stream behaviours.

show abstract

Comparing different methods of bed shear stress estimates in simple and complex flow fields

Cited by 271 publications

References 38 publications

Shear velocity estimates in rough‐bed open‐channel flow

Shear velocity estimates in rough‐bed open‐channel flow

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

Velocity Distribution and 3D Turbulence Characteristic Analysis for Flow over Water-Worked Rough Bed

Contact Info

Product

Resources

About