Scour holes downstream of bed sills in low-gradient channels

Meftah, Mouldi Ben; Mossa, Michele

doi:10.1080/00221686.2006.9521701

Cited by 82 publications

(70 citation statements)

References 13 publications

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“…Scour length needs to be estimated for protecting river embankments to avoid excessive bank erosion. Prediction formulae calibrated on experimental and field data for both scour depth and length are available to designers [ Gaudio et al , 2000; Lenzi et al , 2003a; Marion et al , 2004; Meftah and Mossa , 2006; Martín‐Vide and Andreatta , 2006]. In this paper the geometric properties of the scour profile are analytically discussed and verified on the basis of experimental data from literature.…”

Section: Introductionmentioning

confidence: 99%

Affinity and similarity of local scour holes at bed sills

Tregnaghi

Marion

Gaudio

2007

Water Resources Research

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[1] Excessive erosion of gravel bed rivers represents a hazard, which is often controlled by the construction of bed sills. Shape and volume of equilibrium local scour holes at bed sills in high-gradient streams were investigated by analyzing steady flow experimental data. Scour profiles were normalized by scaling the depths and the longitudinal distance from the upstream sill with the maximum dimensions of the scour hole. Results exhibited a universal geometrical affinity of the scour. Geometrical similarity was also found to occur, but only in a limited range of physical conditions. Evidence on the scaling nature of the scour hole shapes has important implications on the prediction of the eroded volume. In turn, a correct evaluation of the eroded volume is necessary for the optimization of the design of the intersill distance. Prediction formulae are proposed which link the eroded volume to the geometrical, hydraulic, and sediment properties.Citation: Tregnaghi, M., A. Marion, and R. Gaudio (2007), Affinity and similarity of local scour holes at bed sills, Water Resour.

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Section: Introductionmentioning

confidence: 99%

Affinity and similarity of local scour holes at bed sills

Tregnaghi

Marion

Gaudio

2007

Water Resources Research

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“…They concluded that this structure typology can be successfully adopted to prevent erosion in incised channels and furnished equation to satisfactorily assess scour-hole characteristics downstream of them. A similar analysis was conducted by Ben Meftah and Mossa (2006), who studied the erosive processes due to bed sills. In addition, Bhuiyan et al (2007) studied the scour development downstream of W-weirs.…”

Section: Introductionmentioning

confidence: 77%

Erosive and hydrodynamic processes downstream of low-head control structures

Pagliara

Palermo

Kurdistani

et al. 2015

Journal of Applied Water Engineering and Research

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Low-environment impact structures have the advantage to conjugate both hydraulic functioning and environmental care. In particular, these structure typologies are widely used for river restoration both to control sediment transport and to dissipate flow energy. In the present paper, rock grade control structures, stepped gabion weirs, block ramps, and cross-vane weirs are analyzed and compared. Both similitudes and differences in terms of scour characteristics and dissipative efficiency are highlighted. The comparison shows that block ramps are the most efficient structures among those tested. Useful practical relationships are proposed in order to estimate both scour characteristics downstream of each structures and energy dissipation

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“…Some studies have investigated the stochastics nature of turbulent flow around a pier [2,[7][8][9][10][11], but there still remains a lack information concerning the trend of higher order moments for the fluctuating velocities.…”

Section: Introductionmentioning

confidence: 99%

Turbulent Flow Structures and Scour Hole Characteristics around Circular Bridge Piers over Non-Uniform Sand Bed Channels with Downward Seepage

Chavan¹,

Gualtieri

Kumar

2019

Water

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In alluvial rivers bridge piers often cause local scour, a complex phenomenon as a result of the interaction between turbulent flow and bed material. In this paper, the results of an experimental study on the scour hole characteristics around single vertical pier sets on a non-uniform sand bed, under no seepage, and with downward seepage conditions, are described. In case of downward seepage, turbulent statistics, such as Reynolds stress, higher order moments, TKE-flux, and consequently sediment transport, decrease upstream of the pier, while increasing on both sides of it, where the enhanced erosive capacity of the flow results in an increase in the scour hole width. Moreover, the scour hole length shifts downstream. Empirical equations for the evaluation of scour hole characteristics, such as the length, width, area, and volume, including the downward seepage parameter, are proposed and experimentally tested. Model predictions give reasonably good agreement with the experimental data.

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Scour holes downstream of bed sills in low-gradient channels

Cited by 82 publications

References 13 publications

Affinity and similarity of local scour holes at bed sills

Affinity and similarity of local scour holes at bed sills

Erosive and hydrodynamic processes downstream of low-head control structures

Turbulent Flow Structures and Scour Hole Characteristics around Circular Bridge Piers over Non-Uniform Sand Bed Channels with Downward Seepage

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