Assessment the Effects of Different Parameters to Rate Scour around Single Piers and Pile Groups: A Review

Akhlaghi, Ebrahim; Babarsad, Mohsen Solimani; Derikvand, Ehsan; Abedini, Masoud

doi:10.1007/s11831-018-09304-w

Cited by 19 publications

(9 citation statements)

References 42 publications

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“…The formulas for calculating the local scour depth 'd s ' around bridge piers, generally take in their equations three groups of parameters as follows (Akhlaghi et al 2020);…”

Section: Dimensional Analysismentioning

confidence: 99%

Development of a local scour prediction model clustered by soil class

Annad

Lefkir

Mammar-kouadri

et al. 2021

Water Practice and Technology

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Several studies have been conducted to assess local scour formulas in order to select the most appropriate one. Confronted to the limits of the previous formulas, further studies have been performed to propose new local scour formulas. Generalizing a single scour formula, for all soil classes, seems approximate for such a complex phenomenon depending on several parameters and may eventually lead to considerable uncertainties in scour estimation. This study aims to propose several new scour formulas for different granulometric classes of the streambed by exploiting a large field database. The new scour formulas are based on multiple non-linear regression (MNLR) models. Supervised learning is used as an optimization tool to solve the hyper-parameters of each new equation by using the ‘Gradient Descent Algorithm’. The results show that the new formulas proposed in this study perform better than some other empirical formulas chosen for comparison. The results are presented as seven new formulas, as well as abacuses for the calculation of local scour by soil classes.

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“…The formulas for calculating the local scour depth 'd s ' around bridge piers, generally take in their equations three groups of parameters as follows (Akhlaghi et al 2020);…”

Section: Dimensional Analysismentioning

confidence: 99%

Development of a local scour prediction model clustered by soil class

Annad

Lefkir

Mammar-kouadri

et al. 2021

Water Practice and Technology

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“…Most scour events will occur during flood events, usually due to heavy rainfall (e.g., Abé et al 2014), tidal surges (e.g., Maddison 2012) or ice-effects (Carr & Dahl 2017). This paper focusses on local scour effects around bridge piers as opposed to 'general scour' which is due to changes in the river itself e.g., the introduction of an upstream barrier or natural changes in the river flow paths (e.g., Akhlaghi et al 2020), or 'contraction scour' which 'occurs if a structure causes the narrowing of a watercourse or the return to the main river channel of floodplain flow' (Whitbread et al, 2000, p.80).…”

Section: Bridge Scourmentioning

confidence: 99%

“…Kariyawasam et al (2020) reported detailed experiments conducted on 1/60 scale models tested in a geotechnical centrifuge and showed that for an integral bridge, 40% variation in natural frequency may be observed for scouring resulting in around 1/3 pile embedment loss. Akhlaghi et al (2020) presented a detailed review on the key parameters that affect scour: concluding that a 'significant gap' exists between field measurements and laboratory and analytical models for scour.…”

Section: Scour Prediction and Modellingmentioning

confidence: 99%

Assessing the suitability of bridge-scour-monitoring devices

Vardanega

Gavriel

Pregnolato

2021

Proceedings of the Institution of Civil Engineers - Forensic En

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Bridge scour is a complex bridge-management problem. It is also a difficult forensic engineering challenge, as the greatest risk occurs during large flows and flood events, when visual inspection of the bridge piers is often not possible. This paper presents a review of scour prediction and modelling methods, whose results are used to determine the key parameters that scour-monitoring systems need to capture. Then, a review of existing monitoring approaches and technologies for scour monitoring is presented. The paper concludes with the proposal of a novel rating system for evaluating different scour-monitoring techniques. The new rating system is trialled ex-post for seven previously published bridge-scour-monitoring case studies to illustrate the use of the new methodology.

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“…Plates. Scour depth is an important index to evaluate local scour degree [20][21][22][23]. To verify the effectiveness of the wing plates, the scour depths of the protective device with or without the wing plates were compared, and the inclination angles of the wing plates were kept constant at 0 °.…”

Section: Effectiveness Analysis Of Wingmentioning

confidence: 99%

Research on the Wing‐Type Antiscour Device of Pier Based on Scour Test and Numerical Simulation

Wang

Shen

Chen

et al. 2021

Advances in Civil Engineering

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In order to reduce the local scour before the antiscour device of piers, this paper proposed an improvement on a “V-type” device. That was to say, wing plates were set on the surface of the “V-type” device to enhance the diversion and reduce the local scour. To explore the protection effect of the modified device, the inclination angles of the wing plates were set to three angles, and the scour characteristics around the device were studied through the flume scour test and numerical simulation test. The results showed that the wing plates can reduce the impact force of the diving flow which was at the front end of the protective device. Besides, they could also disturb the flow around both sides of the device and weaken its sediment carrying capacity. Thus, the local scour around the device was effectively reduced. Especially, when the wing plates were 30°, the performance of reducing the local scour was the best.

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Assessment the Effects of Different Parameters to Rate Scour around Single Piers and Pile Groups: A Review

Cited by 19 publications

References 42 publications

Development of a local scour prediction model clustered by soil class

Development of a local scour prediction model clustered by soil class

Assessing the suitability of bridge-scour-monitoring devices

Research on the Wing‐Type Antiscour Device of Pier Based on Scour Test and Numerical Simulation

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