Sediment Control by Submerged Vanes

Odgaard, A. Jacob; Spoljaric, Anita

doi:10.1061/(asce)0733-9429(1986)112:12(1164)

Cited by 96 publications

(37 citation statements)

References 8 publications

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“…Models of widely ranging sophistication are available, with many examples of steady-state 2D and 3D models applied to as-built designs [15][16][17][18][19], and Large Eddy Simulation (LES) applied to the resolution of turbulence around isolated or idealized examples of in-stream structures [20,21]. Morphodynamic models are increasingly applied to predict channel evolution in the area surrounding implemented in-stream structures [22,23], and many laboratory studies have been carried out for this purpose [24][25][26][27][28][29]. Despite the increasing sophistication, however, physical and numerical models are predictive in nature, and reliable quantitative monitoring techniques are still needed to understand project outcomes.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

MacVicar

Chapuis

Buckrell

et al. 2015

Water

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Abstract:Instream channel restoration is a common practice in river engineering that presents a challenge for research. One research gap is the development of monitoring techniques that allow for testable predictions of sediment transport and supply. Here we use Radio Frequency Identification (RFID) transponders to compare the short-term (1-year) sediment transport response to flood events in a restored and a control reach. The field site is Wilket Creek, an enlarged creek in a fully urbanized catchment without stormwater management control in Toronto, Ontario. The responses to three flooding periods, each of which are at or above the design bankfull discharge, are described. Key results are that (i) particle mobility is lower in the restored reach for all three periods; (ii) full mobility occurs in the control reach during the first two floods while partial mobility occurs in the restored reach; and (iii) the constructed morphology exerted a controlling influence on particle entrainment, with higher mobility in the pools. Log-transformed travel distances exhibit normal distributions when grouped by particle size class, which allows a statistical comparison with power law and other predictive travel-distance relations. Results show that three bedload transport conditions can occur, with partial mobility associated with a OPEN ACCESSWater 2015, 7 5567 mild relation between particle size and travel distance and full mobility associated with either a flat or steep relation depending on the degree of integration of particles in the bed. Recommendations on seeding strategy and sample sizes are made to improve the precision of the results by minimizing confidence intervals for mobility and travel distances. Even in a short term study, the RFID sediment tracking technique allows a process-based assessment of stream restoration outcomes that can be used to justify the instream intervention and plan future attempts to stabilize and enhance the system.

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Section: Introductionmentioning

confidence: 99%

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

MacVicar

Chapuis

Buckrell

et al. 2015

Water

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“…The outer bank of bend reach become subjected to the scour due to a high velocity component near the surface, while the low velocity component created near bed has the influence to transport the scoured particles from the outer bank towards the inner bank thus causes the deposition, this mechanism was stated by Odgaard and kennedy (1983;Odgaard and Spoljaric, 1986;Odgaard and Wang, 1991a;Marelius and Sinha, 1998;Voisin and Townsend, 2002) and many others before and thereafter. Different techniques have been used in practice to prevent or mitigate the action of this problem at river bends includes construction the dikes and revetments.…”

Section: Introductionmentioning

confidence: 87%

Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180° Bend

Maatooq¹,

Adhab²

2017

American Journal of Engineering and Applied Sciences

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A small aspect ratio of submerged vanes when used near the outer bank at the angle of attack between 10° to 20° and at the initial height above the bed between 20-40% of flow depth is considered one of the most successful river training structures. Vanes when located within the bends of river, produces helical swirls at inverse action with the centrifugally secondary current action. Accordingly, its existence leads to mitigate the influence of the secondary current, thus reducing the outer bank erosion. The present study aims to investigate the effect of distance which measured from the outer bank (δb) on the hydraulic performance of vanes when it arranged at a specified configuration within 180° bend. As a result, when the submerged vanes have been installed at δb/b = 0.25 within the third to the fifth sectors of bend and δb/b = 0.1 within the sixth sector at a zigzag pattern led to lesser outer bank scour with the Percentage Improvement (PIindicator) equal to 72.71%.

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“…Such measures include either changing the flow patterns directly or protecting the riverbed. Examples of erosion preventing measures are utilization of riprap (Martin-Vide et al 2010); undulated, macrorough riprap (Chèvre and Schleiss 2005); installation of bottom vanes (Odgaard and Spoljaric 1986;Odgaard and Wang 1991;Voisin and Townsend 2002) or bank-attached vanes (Bhuiyan et al 2010); lining of the outer bank with concrete slabs (Sloff et al 2006;Roca et al 2007); construction of groynes or spur dikes (Przedwojski 1995;Sukhodolov et al 2002;Jamieson et al 2013b, a); construction of bendway weirs (Abad et al 2008); and construction of bandal-like structures (Teraguchi et al 2011). Blanckaert et al (2010Blanckaert et al ( , 2012 studied the influence of roughness at the outer bank in two distinct situations in a laboratory 193°channel bend (Blanckaert 2002), a rectangular channel, and a trapezoidal channel with 30°-inclined outer bank.…”

Section: Introductionmentioning

confidence: 99%

Wall-Roughness Effects on Flow and Scouring in Curved Channels with Gravel Beds

2016

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Due to a complex three-dimensional flow pattern, the outer banks of river bends are predisposed to erosion. When endangering civil structures, preventing measures to mitigate this erosion are thus required. Vertical ribs at protection walls for scour reduction have been applied to several flood protection projects in mountain rivers; nevertheless, no systematic and intensive study has been presented so far to evaluate their effect. This paper investigates experimentally the effect of vertical ribs, placed as macroroughness elements on the outer vertical wall of a 90°laboratory channel bend. Systematic tests were performed using a wide and coarse grain-size distribution. Scour formation and velocity distribution were assessed in the channel in the presence of a macrorough outer bank, materialized in the laboratory by vertical elements placed on the outer vertical wall along the channel bend. Experiments showed that the macrorough outer bank changed considerably the bed morphology under equilibrium conditions. Maximum scour depth is considerably reduced by the vertical ribs placed at an optimal spacing on the bend outer wall. A considerable grain sorting process occurs across the cross section in the bend, which influences the scour process; differences are observed between situations with and without macrorough banks. The distribution of the time-averaged velocity field across the section shows the influence of the channel rough wall. An optimal macroroughness configuration in terms of scour reduction is discussed and proposed. It was observed that when spacing between vertical ribs is too reduced, these ribs act as uniformly distributed wall roughness, contributing to the width reduction due to the occupation of the cross section and increasing consequently the flow velocity with negative effects in scour reduction.

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Sediment Control by Submerged Vanes

Cited by 96 publications

References 8 publications

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180° Bend

Wall-Roughness Effects on Flow and Scouring in Curved Channels with Gravel Beds

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Sediment Control by Submerged Vanes

Cited by 96 publications

References 8 publications

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180&deg; Bend

Wall-Roughness Effects on Flow and Scouring in Curved Channels with Gravel Beds

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Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180° Bend