Combined flow-altering countermeasures against bridge pier scour

Gaudio, Roberto; Tafarojnoruz, Ali; Calomino, Francesco

doi:10.1080/00221686.2011.649548

Cited by 76 publications

(41 citation statements)

References 14 publications

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“…Zaratti et al [11] and Farooq et al [40], whose studies are the only few to consider the combined effect of modifications, used pier shapes other than circular. Other studies have typically assumed that a circular shape is suitable for pier modifications, for example Gaudio et al [41], whereas, in practice, different pier modifications can be more effective by applying suitable pier shapes. The aim of the present experimental study is to address directly the aforementioned two limitations and is thus novel in the following two aspects compared to previous experimental research.…”

Section: Experimental Flumementioning

confidence: 99%

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Farooq

Ghumman

2019

Water

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Previous experimental research on utilizing pier modifications as countermeasures against local scour has focused primarily on circular pier. It is of utmost importance to further investigate the most suitable pier shape for pier modification countermeasure separately and in combination. This experimental study aims to reduce the stagnation of the flow and vortex formation in front of the bridge pier by providing a collar, a hooked collar, a cable, and openings separately and in combination around a suitable pier shape. Therefore, six different pier shapes were utilized to find out the influence of pier shape on local scouring for a length-width ratio smaller than or equal to 3. A plain octagonal shape was shown as having more satisfactory results in reducing scour compared to other pier shapes. Furthermore, the efficiency of pier modification was then evaluated by testing different combinations of collar, hooked collar, cable, and openings within the octagonal bridge pier, which was compared to an unprotected octagonal pier without any modification. The results show that by applying such modifications, the scour depth reduced significantly. The best combination was found to be a hooked collar with cable and openings around an octagonal pier. It was revealed that the best combination reduced almost 53% of scour depth, as compared to an unprotected octagonal pier.

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Section: Experimental Flumementioning

confidence: 99%

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Farooq

Ghumman

2019

Water

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“…Considering the fact that a bed sill across the whole section of the channel would result in significant scouring near the side wall [28,38,39], a bed sill with a limited length (L bs ) of 2D, viz. L bs =0.32 m, and a thickness of 3 mm is tested in this study.…”

Section: Downstream Bed Sillmentioning

confidence: 99%

An experimental study on pile scour mitigating measures under waves and currents

Liang

Zhang

Yang

2015

Sci. China Technol. Sci.

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An experimental study has been carried out to investigate effects of four flow-altering scour countermeasures placed around a foundation pile under currents only as well as under coexisting waves and currents. The countermeasures are sacrificial piles, downstream bed sill, sleeve and slot in the pile. Their arrangements follow the suggested optimal configurations, with some of them slightly modified. In terms of the evolution of scour depth and bed topography around the pile, the scour countermeasures are evaluated, subjected to steady currents with or without irregular waves. A comparison between maximum scour depth with the countermeasures and one without the countermeasures demonstrates the efficiency of countermeasures. All the tested scour measures reduce the scour depth by 17.6%-42.6% under the action of currents only and 5.8%-24.0% under the combined action of both currents and waves. The results also show that it takes a shorter time for the scour depth to reach its equilibrium with the measures under either coexisting currents and waves or currents only than ones without the measures.

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“…A further inquiry can be around devising ways by which such first principles can be used to design engineering against scour, eventually observing that, in the real world, engineering practitioners use coarser sediment as rip-rap. Since pier shape can also affect the scour geometry [19][20][21], this installation may be used to demonstrate influence of pier shape on scouring process, by placing piers with different shapes inside the fluvial model.…”

Section: Demonstration Protocolmentioning

confidence: 99%

Floodopoly: Enhancing the Learning Experience of Students in Water Engineering Courses

Valyrakis

Latessa

Koursari

et al. 2020

Fluids

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This study focuses on the utilisation of lab-based activities to enhance the learning experience of engineering students studying water engineering and geosciences courses. Specifically, the use of “floodopoly” as a physical model demonstration in improving the students’ understanding of the relevant processes of flooding, infrastructure scour and sediment transport, and improve retention and performance in simulation of these processes in engineering design courses, is discussed. The effectiveness of lab-based demonstration is explored using a survey assessing the weight of various factors that might influence students’ performance and satisfaction. It reveals how lab-centred learning, overall course success is linked with student motivation and the students’ perception of an inclusive teaching environment. It also explores the effectiveness of the implementation of student-centred and inquiry-guided teaching and various methods of assessment. The analysis and discussion are informed by students’ responses to a specifically designed questionnaire, showing an improvement of the satisfaction rates compared to traditional class-based learning modules. For example, more students (85%) reported that they perceived the lab-based environment as an excellent contribution to their learning experience, while less students (about 57%) were as satisfied for a traditional class-based course delivery. Such findings can be used to improve students’ learning experience by introducing physical model demonstrations, similar to those offered herein.

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Combined flow-altering countermeasures against bridge pier scour

Cited by 76 publications

References 14 publications

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

An experimental study on pile scour mitigating measures under waves and currents

Floodopoly: Enhancing the Learning Experience of Students in Water Engineering Courses

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