Stream barb performance in a semi-alluvial meandering channel

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

doi:10.2495/rm110201

Cited by 3 publications

(5 citation statements)

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“…Pre-and post-barb spatially distributed velocity fields measured by ADP spatial surveying were shown in Jamieson [6,7]. Here we assess the relevance of the observed spatial velocity distributions for fish habitat.…”

Section: Adpmentioning

confidence: 94%

“…Location and identification of "as built" barbs and transects are shown in Figure 1 (a) Aerial photograph of the Sawmill Creek study area, where the dashed line indicates the right bank and flow is from south to north (from Jamieson [5]. (b) "As built" barb placement and identification of transects for data collection (from Jamieson [7]).…”

Section: Site Informationmentioning

confidence: 99%

“…Therefore the ADP surveys were referenced according to bottom tracking provided by the SonTek software (SonTek/YSI [10]). Further details on the ADP surveying and data processing procedures are available elsewhere in Jamieson [6,7]. Fish abundance and habitat data were provided by the City of Ottawa's Water Environment Protection Program (WEPP) (City of Ottawa [11,12]).…”

Section: Site Informationmentioning

confidence: 99%

“…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]. This paper reports updated results regarding the effects of submerged groyne rehabilitation on the aquatic environment of an urban creek through the use of recently available flow velocity and bathymetry data, as well as fish abundance and habitat assessments provided by the City of Ottawa's Water Environment Protection Program (WEPP).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

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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.

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Section: Adpmentioning

confidence: 94%

Section: Site Informationmentioning

confidence: 99%

Section: Site Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

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“…For example, Fukudome et al [40] studied practical methods for creating pool habitats using drystone-made spur dikes in straight low-flow channels. In North America, upward submerged spur dikes called stream barbs were implemented for environmental restoration in channelized rivers [41,42].…”

Section: Spur Dike Applicationsmentioning

confidence: 99%

Spur Dike Applications for the Sustainability of Channels in Incised Steep Bend Streams

Ohtsuki,

Kono,

Arikawa

et al. 2024

Water

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Japan’s rivers are shaped by distinctive topography and abundant rainfall, and they face flooding and sediment supply escalation concerns under climate change. Small- and medium-sized rivers tend to catch unprecedented forces that exceed planned levels, leading to substantial widening and excavation. Thus, there is a demand for a method that is capable of managing significant flood flows over an extended period. The spur dike can maintain channel clearance by promoting erosion as well as providing bank protection. However, the effectiveness of this spur dike function has not been well studied in small- and medium-sized rivers and curved reaches. In this study, we evaluate the function of spur dikes in improving channel sustainability based on examples of small- and medium-sized rivers that have maintained their channel for more than ten years after spur dike installation. First, the applicability of the empirical rule was evaluated by comparing it with actual cases of erosion depths in curved sections in Japan. Next, one-dimensional simulations were performed to evaluate the sustainability of the section over a long period. Finally, a depth-averaged morphodynamic simulation, including the secondary flow effect, was applied to evaluate the location of the flow core and elevation changes due to the spur dike. The results showed that a slight difference in the ratio of river curvature radius to river width (r/B) caused the river channel to be erosive and sedimentary. The reasons for the difference were the cross-sectional expansion caused by the excavation of the bend and the difference in the plane flow regime caused by the shift of the flow core to the inside of the bend. Although it is structurally challenging to reproduce localized scour around a spur dike in a depth-averaged simulation, it is essential for designing to apply the simulation model and combine empirical knowledge.

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

et al. 2013

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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.

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Stream barb performance in a semi-alluvial meandering channel

Cited by 3 publications

References 2 publications

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

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

Spur Dike Applications for the Sustainability of Channels in Incised Steep Bend Streams

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

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