Bridge Scour and Sediment Analysis for River Restoration Projects

MacBroom, James G.

doi:10.1061/9780784412312.252

Cited by 4 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this region, characterized by gently sloped streams [8,49], more than 90 percent of the data points fell below the 300 W/m 2 stream power threshold line despite large discharge ranges. This agrees with MacBroom et al [16], who pointed out the decrement possibility of stream power in areas with higher discharge but with a decreasing slope downstream.…”

Section: Stream Power Screening Tool By Physiographic Provincessupporting

confidence: 93%

“…Zavadil et al [44], using field data collected from rivers in Australia, showed that stable incised streams can exhibit a stream power as high as 60 W/m 2 . A low-gradient river with an unconsolidated fine-grained bed in Illinois, on the other hand, starts to meander at a stream power of 10 to 20 W/m 2 [16]. Similar discrepancies are witnessed in the threshold value that corresponds with the initiation of major geomorphic changes.…”

Section: Stream Power Screening Toolmentioning

confidence: 74%

“…For example, Yochum et al [19] showed that their study sites underwent nominal geomorphological changes despite experiencing a stream power within the range of 800 to 1000 W/m 2 . This variability reveals that floods of similar magnitude can have wide-ranging impacts based on particle size distribution, cross-section characteristics, channel confinement, and channel alignment [16].…”

Section: Stream Power Screening Toolmentioning

confidence: 97%

“…Stream power is a vital metric that drives stream and floodplain-attributed processes including sediment transport and deposition [16]. Many aspects of the fluvial system have been shown to be impacted by stream power [17]; hence, it has been used as a practical means of investigating channel geomorphic processes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Assessing Streambed Stability Using D50-Based Stream Power Across Contiguous U.S.

Jha

Asamen

Allen

et al. 2022

Water

View full text Add to dashboard Cite

Streambed aggradation and degradation are ways in which a stream will respond to changes in the incoming flow and sediment loads. Several environmental and societal problems are attributed to these channel bed adjustments. Prior studies have extensively used stream power to discern dominant channel processes and establish threshold limits required to trigger channel modifications. However, these studies were constrained by limited datasets and the scope of the applications. The current study used a large dataset of streambed median grain size (D50) across the contiguous U.S. in conjunction with a screening tool to assess the streambed stability for channel erosion and deposition potential. Analysis at the Physiographic Province level indicated major geomorphic changes are highly likely to occur in the Blue Ridge and Pacific Border provinces. Deposition-dominated streams are prominent in the Central Lowland, Great Plains, and Coastal Plain, whereas the Colorado Plateaus and Wyoming Basin have the highest percentage of stable channels. Smoothed spatial maps of stream power indicated the prevalence of high stream power in the Northeast and Pacific Northwest regions of the U.S. Comparison of channel erosion and deposition predictions using the stream power map with actual field calculated aggradation and degradation results yielded a 55% prediction accuracy. Further analysis based on the stream order revealed the association of higher stream power with lower stream orders.

show abstract

Section: Stream Power Screening Tool By Physiographic Provincessupporting

confidence: 93%

Section: Stream Power Screening Toolmentioning

confidence: 74%

Section: Stream Power Screening Toolmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessing Streambed Stability Using D50-Based Stream Power Across Contiguous U.S.

Jha

Asamen

Allen

et al. 2022

Water

View full text Add to dashboard Cite

show abstract

“…Built structures can apply additional erosive forces on the bed around the structure. As a result, sedimentation and erosion rates increase locally around these structures, leading to cavities around these barriers (Foti & Sabia 2011;MacBroom 2012). In this regard, the formation of scouring cavities around the piers and supports of the bridge, which takes place due to nonobservance of hydraulic and river engineering issues in the designs, is one of the main causes of the destruction of bridges (Suib et al 2006).…”

Section: Introductionmentioning

confidence: 99%

A laboratory study of the effect of asymmetric-lattice collar shape and placement on scour depth and flow pattern around a bridge pier

Raeisi

Ghomeshi

2021

Water Supply

View full text Add to dashboard Cite

In this study, the effect of collar shape and its alignment on reducing scour depth in the front part of the structure, with the pier under clear water conditions, was investigated to determine changes in the flow pattern around the structure. The collars were examined in two asymmetrical shapes with dimensions of and at three levels of installation relative to the bed: bed level, 1 and 2 cm above the bed. The results revealed that the presence of the collar not only reduced the ultimate scouring depth but also delayed the formation of the scouring hole. This impact was observed to be greater as the size of the collar increased. In addition, reducing the alignment of the collars can lead to better performance of the collar and its efficiency in the cost of the design. Therefore, collars installed on the bed surface indicated good performance in controlling scour. On the other hand, once the flow characteristics around the bridge pier with and without collar were examined, it was determined that affecting the downstream flow reduces the strength of the vortices and changes the reciprocating behavior and the displacement of the vortices.

show abstract