Design of stream barbs for field scale application at Sawmill Creek, Ottawa

Jamieson, E. C.; Rennie, C. D.; Townsend, Raymond J.

doi:10.2495/rm090261

Cited by 4 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this outer bank erosion was not observed downstream of any of the other barbs. This singular occurrence of outer bank erosion was likely due to: (1) B2 being located in the most dynamic region of the two bends, as determined by the numerical modelling [5]; and (2) compared to the other barbs, the barb crest slope at T19 (B2) was the steepest (> 50 %) (Fig. 6), and therefore permitted the greatest amount of overtopping flow in this region.…”

Section: Channel and Barb Topographymentioning

confidence: 99%

“…These surveys focus on the flow field in bend 1 only, where it was expected the barbs would have the greatest influence on the flow and morphology. This expectation was based on; (1) the more typical pool geometry in this bend versus the second bend, and (2) the results of the numerical modelling that established the optimum barb design for the site [5]. The numerical study found that the outer bank of the first bend (from T20 -T16, Fig.…”

Section: Study Site and Monitoring Programmentioning

confidence: 99%

“…Figures 1A and B shows photos of the seven barbs, which are numbered in the downstream direction. Additional field site information and barb design details are provided in [5]. Discharge data for the past three years (2008)(2009)(2010) were collected at a stream gauging station (CK18-Q1), approximately 1.2 km downstream of the study site, where the contributing watershed at the site is 92% of the watershed at the gauge.…”

Section: Study Site and Monitoring Programmentioning

confidence: 99%

“…Details of the barb design at the study site, including three-dimensional (3-D) (flow and sediment transport) numerical simulation results of the proposed layout are presented elsewhere [5]. This paper focuses on (i) the unique site conditions and monitoring methodology; (ii) preliminary results of the 3 year monitoring program; and (iii) recommendations for future design and implementation of stream barbs.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stream barb performance in a semi-alluvial meandering channel

Jamieson¹,

Rennie²,

Townsend³

2011

WIT Transactions on Ecology and the Environment

Self Cite

View full text Add to dashboard Cite

A series of seven stream barbs were installed at two consecutive channel bends in Sawmill Creek, a semi-alluvial stream located in Ottawa, Canada. Stream barbs (also known as submerged groynes) are low-profile linear rock structures that extend from the outside bank regions of channel bends in an upstream direction, to redirect the attacking currents and prevent erosion of the bank. As well as providing bank protection, these structures promote vegetated stream banks, create resting pools and scour holes for fish habitat, and increase biodiversity for aquatic species. Despite these benefits, because of their relative novelty as river training structures, stream barbs are not a common means of stream bank protection in Canada and are possibly non-existent for semi-alluvial or clay channels. Three years of monitoring and measurement of flow conditions (discharge, water velocity and depth) and bathymetry, before (2 years) and after (1 year) the construction of the barbs, have been collected at the Sawmill Creek study site, providing valuable data for understanding their performance in a semi-alluvial channel. Sawmill Creek has a predominately clay bed and banks, presenting a rare opportunity to study the unique dynamics between flow and sediment transport within a clay channel. This paper reports on (i) the unique site conditions and monitoring methodology; (ii) preliminary results of the 3 year monitoring program; and (iii) recommendations for future design and implementation of these structures.

show abstract

Section: Channel and Barb Topographymentioning

confidence: 99%

Section: Study Site and Monitoring Programmentioning

confidence: 99%

Section: Study Site and Monitoring Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stream barb performance in a semi-alluvial meandering channel

Jamieson¹,

Rennie²,

Townsend³

2011

WIT Transactions on Ecology and the Environment

Self Cite

View full text Add to dashboard Cite

show abstract

“…The barb installation design for this project was reported by Jamieson [5]. Initial evaluation of the influence of barb installation on channel hydraulics and morphology was described in Jamieson [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of submerged groynes for urban creek rehabilitation on aquatic environment at Sawmill Creek in Ottawa, Canada

Ruta

Jamieson

Rennie

et al. 2013

WIT Transactions on Ecology and the Environment

Self Cite

View full text Add to dashboard Cite

Submerged groynes (low-profile linear rock structures, also called stream barbs) were installed in a reach of Sawmill Creek in Ottawa, Canada in order to mitigate outer bank erosion in two consecutive bends. These structures have had an effect on both the aquatic life and habitat in the area. Changes in both the flow field and bathymetry have been recorded over 4 years (including 2 years prior to implementation of the groynes) using acoustic Doppler velocimeters, an acoustic Doppler current profiler, and a total station, respectively. The City of Ottawa's Water Environment Protection Program (WEPP) has also provided fish abundance and habitat data for the study site as well as a control site located approximately 200 m downstream. The velocity and bathymetry data collected, combined with the fish abundance data, were used to demonstrate a causal relationship between the implementation of submerged groynes and the recorded change in fish abundance and habitat. There has been a consistent increase in fish abundance at the study site compared to that of the control site, indicating that the presence of the groynes is beneficial to the aquatic environment. This could be attributed to select features provided by the groynes which were not inherently available at the study site, namely: (1) velocity refuge and (2) visual isolation from predators.

show abstract

Monitoring stream barb performance in a semi‐alluvial meandering channel: flow field dynamics and morphology

et al. 2013

View full text Add to dashboard Cite

A series of seven stream barbs were installed in two consecutive channel bends of Sawmill Creek (Ottawa, Canada), a semi-alluvial stream with bed and banks composed of consolidated clay. Stream barbs (also known as submerged groynes) are low-profile linear rock structures that project out from the bank (in an upstream direction) to redirect flow and prevent erosion of the bank. As well as providing bank protection, barbs promote vegetated stream banks, create scour hole resting pools for fish habitat and can increase aquatic species diversity. Flow conditions (discharge and water levels), water velocity distribution using acoustic Doppler velocimeters and an acoustic Doppler current profiler, and bathymetry using a Total Station have been measured over a period of 5 years, both before (2 years) and after (2 years) the construction of the barbs, providing valuable data for understanding stream barb performance in a semi-alluvial channel. Pre-barb velocity measurements indicate that the flow field in the first bend is dominated by strong secondary circulation and high cross-stream bed stresses that comprise a substantial proportion of the total near-bed Reynolds stress. Post-barb results indicate that velocity magnitude along the outer bank was reduced. Scour occurred in the channel centre near barb tips, but in general, little to no bathymetry changes were measured between seasonal surveys, suggesting that the barbs had limited impact on bed topography and/or that semi-alluvial channel bends are resistant to change. Recommendations for future design and implementation of stream barbs are also included.Note that quoted discharge for acoustic Doppler velocimeter (ADV) surveys is based on the downstream gauge recording (at 92% of contributing watershed), whereas discharge for acoustic Doppler profiler (ADP) surveys is from ADP data collected on-site (at 90% of contributing watershed) based on an average of repeated transects. Where available, the discharge from the downstream gauge is also provided (in brackets) for comparison with M9 discharge measurement at the site. Water level data are from the on-site water level logger. 616 E. C. JAMIESON et al.

show abstract

Design of stream barbs for field scale application at Sawmill Creek, Ottawa

Cited by 4 publications

References 8 publications

Stream barb performance in a semi-alluvial meandering channel

Stream barb performance in a semi-alluvial meandering channel

Influence of submerged groynes for urban creek rehabilitation on aquatic environment at Sawmill Creek in Ottawa, Canada

Monitoring stream barb performance in a semi‐alluvial meandering channel: flow field dynamics and morphology

Contact Info

Product

Resources

About