Sedimentation Engineering

doi:10.1061/9780784408230

Cited by 116 publications

(10 citation statements)

References 127 publications

(203 reference statements)

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“…Furthermore, rivers with a mixed sediment size typically develop stabilizing grain structures, with coarse surface material "armoring" finer subsurface sediments (Church, 2006;Dietrich et al, 1989). This increases the hydraulic force required to transport surface grains and therefore expose the finer sediment beneath (Parker, 2008). Consequently, bedload transport in most rivers occurs rarely and sporadically but once surface grains are disturbed, rivers can then transport exposed fine sediment for longer.…”

Section: Fast Flowing Riversmentioning

confidence: 99%

Invertebrate zoogeomorphology: A review and conceptual framework for rivers

Mason

Sanders

2021

WIREs Water

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Invertebrates are important sediment engineers, making up for their small body size with abundance and behavioral diversity. However, despite the recognized importance of invertebrates as sediment engineers in terrestrial and marine environments, zoogeomorphology in rivers has primarily considered larger taxa, such as fish and beaver. This article reviews the zoogeomorphic effects of invertebrates in freshwater habitats, with a focus on rivers. To better synthesize current zoogeomorphic research and to help guide future studies we build a conceptual model considering biotic (behavior, abundance, body size, life history, and species invasions) and abiotic (geophysical energy and sediment grain size) controls on the direction and magnitude of zoogeomorphology. We also incorporate invertebrate engineers into conceptual sediment entrainment models, to understand their geomorphic role in the context of hydraulic power and sediment size. We structure our review around invertebrate behavior as a key control on whether invertebrates have a sediment destabilizing or stabilizing impact. Invertebrate zoogeomorphic behavior are diverse; the majority of research concerns bioturbation, a result of locomotion, foraging, and burrowing behaviors by many taxa. Similarly, burrowing into bedrock by a caddisfly and non-biting midge larvae promotes bioerosion. Attachment to the substrate, (e.g., silk nets by caddisfly larvae or byssal threads by some mussels) can stabilize sediment, providing bioprotection. Bioconstructions (e.g., caddisfly cases and mussel shells) may have either stabilizing or destabilizing effects depending on their density and abiotic context. Interactions between lotic invertebrates and fluvial processes are complex and understudied, requiring further research across a greater range of taxa, behaviors, and spatiotemporal scales.

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Section: Fast Flowing Riversmentioning

confidence: 99%

Invertebrate zoogeomorphology: A review and conceptual framework for rivers

Mason

Sanders

2021

WIREs Water

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“…The flow depth and scour depth correlation of 0.80 for the tests is illustrated in Figure 16 and is expected (Laursen 1953). As stated in ASCE Manual 54 (Vanoni 2006;38), "the equilibrium (scour) depth appears to depend only on the initial depth of flow and to be independent of both the mean velocity and the sediment characteristics." Thus, the greatest scour depth for these tests occurred with the 16.9 ft flow depth, and the lowest scour depth occurred with the 9.1 ft flow depth with 6.7 and 3.4 ft of scour respectively (Table 1 and Figure 16).…”

Section: Resultsmentioning

confidence: 99%

General model study of scour at proposed pier extensions – Santa Ana River at BNSF Bridge, Corona, California

Sharp¹,

McAlpin²,

Bell³

et al. 2017

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A proposed pier nose extension intended to reduce the local pier scour at the Burlington Northern Santa Fe Railway crossing on the Santa Ana River near Corona, CA, was tested in a general physical model. The applied model was a 1:30 Froude-scaled model of the bridge piers, other related structures, and the adjacent channel. Data from the model provided a qualitative and quantitative evaluation of the local scour behavior at the estimated worst-case scenarios for both the existing and proposed conditions. The existing conditions represent the current prototype configuration exposed to potentially larger future dam releases from the upstream Prado Dam. The proposed condition includes pier nose extensions, concrete caps (pile enclosures), and flow guide walls, all intended to reduce scour at the bridge. The primary location for the minimum scour elevation (maximum scour depth) occurred around pier set 5. The proposed conditions showed as high as 60% improvement in reducing the scour depth with the proposed conditions configuration. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR.

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“…A stable channel can be described by a balance of erosion and sedimentation processes that produce average dimensions, which do not change significantly over the years (Bonakdari et al 2020). It is essential to estimate the dimension correctly to minimise the erosion and sedimentation effect (Garcia 2008). The prediction of a stable channel depends on various parameters and is described by the characteristics of the top width of the channel, the mean depth of the flow and the longitudinal slope (Bonakdari et al 2020).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…For decades, researchers tried to correlate channel geometry to the geomorphological variables. According to Chang (1988) and Garcia (2008), a stable channel was determined by empirical and analytical methods. Blench (1957), Lacey (1930), Lindley (1919), Kennedy (1895) and Simons & Albertson (1960) investigated the regime concept by examining the channel stability parameters by using statistical methods.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

GEP- and MLR-based equations for stable channel analysis

Harun

Ghani

Mohammadpour

et al. 2021

Journal of Hydroinformatics

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For decades, research on stable channel hydraulic geometry was based on the following parameters: river discharge, dimensionless discharge, the median size of bed material and the slope. Although significant research has been conducted in this area, including applied machine learning to increase the geometry model prediction accuracy, there has been no remarkable improvement as the variables used to describe the geometry relationship remain the same. The novelty of this study is demonstrated by the parameters used in the stable channel geometry equations that outperform the existing equation's accuracy. In this research, sediment transport parameters are introduced and analysed by applying the multiple linear regression (MLR) and gene expression programming (GEP) methods. The new equation of the width, depth and bed slope can give much-improved results in efficiency and lower errors. Furthermore, a new parameter B/y is introduced in this study to solve the restriction issue, either in width or depth prediction. The results from MLR and GEP show that in addition to the existing hydraulic geometry parameter, the B/y parameter is also able to give high accuracy results for width and depth predictions. Both calibration and validation for the B/y parameter yield high R2 and NSE values with low mean squared errors and mean absolute errors.

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Sedimentation Engineering

Cited by 116 publications

References 127 publications

Invertebrate zoogeomorphology: A review and conceptual framework for rivers

Invertebrate zoogeomorphology: A review and conceptual framework for rivers

General model study of scour at proposed pier extensions – Santa Ana River at BNSF Bridge, Corona, California

GEP- and MLR-based equations for stable channel analysis

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