The effects of height and vertical position of slot on the reduction of scour hole depth around bridge abutments

Osroush, Mehdi; Hosseini, Seyed Abbas; Kamanbedast, Amir Abbas; Khosrojerdi, Amir

doi:10.1016/j.asej.2019.02.004

Cited by 17 publications

(9 citation statements)

References 10 publications

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“…A study has been conducted with increasing Froude number. The scour depth increases with and without the slit as a function of the Froude number and the depth and size of the surrounding scour hole abutment [32]. In proof studies, it has been noted that erosion starts at the higher corner of piers without grooves and subsequently extends to its bottom portion.…”

Section: Research Backgroundmentioning

confidence: 99%

Prediction of local scour depth around bridge piers: modelling based on machine learning approaches

Kumar,

Baranwal,

Das

2023

Eng. Res. Express

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Scouring is a threat to the foundations of bridges, and it frequently results in bridge collapse. Recently, machine-learning approaches have become quite popular in solving hydraulic and hydrologic problems. The present study adopted adaptive neuro-fuzzy inference systems (ANFIS) and gene expression programming (GEP) to model bridge pier scour depth. A temporal scour depth relationship has been proposed based on ANFIS and GEP approaches. In this paper, 500 data sets have been used to model the temporal scour depth using ANFIS and GEP models, in which 80% (400) data sets for training and 20% (100) datasets for testing purposes are used to develop the model. The performance of the GEP model is validated by comparing the results of the developed ANFIS model and other existing empirical equations. It is found that the GEP-based scour depth prediction model is effective in training and validation. The present GEP model accurately predicts the scour depth with a mean absolute percentage error (MAPE) value of less than 12% and an R2 value greater than 0.85. Thus, the GEP model can be utilized to predict scour depth around the bridge pier for unsteady flow conditions.

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Section: Research Backgroundmentioning

confidence: 99%

Prediction of local scour depth around bridge piers: modelling based on machine learning approaches

Kumar,

Baranwal,

Das

2023

Eng. Res. Express

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“…A secondary flow which is generated by small shipping mooring system could be suspected for this scouring phenomenon. Mehdi Osrousha et al [24] investigate the effects of the height and vertical position of slots on the reduction of scouring on the periphery of rectangular abutments where based on 25 experiments conducted under clear water conditions, find that the use of slots in abutments was more effective in reducing scouring than the use of bridge piers.…”

Section: Sedimentation Patternmentioning

confidence: 99%

The Influence of the New LRT Pier to the Sedimentation Pattern Around Ampera Bridge in Musi River, South Sumatera, Indonesia

Kusuma¹

2020

GEOMATE

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Sedimentation rate, which is the most important parameters of the inland water way performance like Musi River becoming one of a major research topic in Indonesia. The influence of additional pier for the new LRT Bridge constructed parallel to Ampera Bridge to the sedimentation pattern of Musi River was discussed in this paper. Currently, as most of the rivers in Indonesia, a complete field data observation of discharge, sediment characteristic is a luxury one to have. That's why mathematical model, supported by eligible limited field measurements for model calibration and verification, is commonly used to predict the above parameters. Hydrometric survey of water level, sediment samples (both suspended and bed sediment), velocity and bathymetry were conducted to get instantaneous field data. Based on the comparison of two bathymetry map with difference periods of measurements, it was found that the sedimentation rate, was different for high and low tide. Tank model of Sacramento and USLE were used to respectively generate synthetic river discharge and soil surface erosion rate. Hydrodynamic model of SMS 8 was used to predict annual rate of sedimentation. Good comparison of the field measurement and SMS model results was found for current and sediment pattern. The maximum sedimentation occurs during the high tide where the backwater was generated by sea intrusion. The New LRT pier increase the impact of river contractions for both maximum velocity around the Ampera Bridge up to 1.5 time and sedimentation rate behind the pier group of the bridges.

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“…The former includes installing heavy elements such as riprap stones, gabions, cable-tied blocks, reno-mattresses, grout bags, etc. Flow-altering countermeasures, however, include the installation of submerged vanes, collars, sacrificial piles, spur dikes, and slots [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…From a scouring perspective, riprap stones should be designed to withstand the local shear stresses that form at the abutment. According to Chiew [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]; and Melville et al [20], riprap layer failures around bridge foundations include shear, winnowing, edge and bed-form undermining failures. Shear failure, which occurs when turbulent flow erodes and moves riprap stones around bridge foundations, can be mitigated by using an appropriate riprap size.…”

Section: Introductionmentioning

confidence: 99%

Combination of Riprap and Submerged Vane as an Abutment Scour Countermeasure

Fathi

Zomorodian

Zolghadr

et al. 2023

Fluids

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Scour is one of the main causes of hydraulic structural failures. The present experimental study examines the use of riprap, submerged vanes, and a combination of these for scour reduction around vertical walls and spill-through abutments under clear-water conditions. Specifically, the influence of placing riprap stones with different apron shapes (geometry) and/or a group of submerged vanes of constant height and length on abutment scour was examined. The main aim is to propose the optimum apron geometry and placement of submerged vanes to (1) reduce edge failure at vertical walls and spill-through abutments; and (2) prevent shear failure at the spill-through abutment (no shear failure is observed around the vertical wall abutment). The results show that using ripraps for scour protection is more effective than submerged vanes. However, the highest reduction in scour depth was achieved when a combination of riprap and submerged vanes was used together. This arrangement can reduce the maximum clear-water scour depth by up to 54% and 39% with vertical walls and spill-through abutments, respectively. Furthermore, selecting appropriate apron scale ratios reduces the required riprap volume by up to 46% and 31% for the vertical wall and spill-through abutment, respectively. In addition, the installation of vanes increased the riprap stability and reduced edge failure in both abutments tested. Finally, using riprap aprons with proper scales ratios at the downstream side of the spill-through abutment also prevents shear failure in this zone.

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The effects of height and vertical position of slot on the reduction of scour hole depth around bridge abutments

Cited by 17 publications

References 10 publications

Prediction of local scour depth around bridge piers: modelling based on machine learning approaches

Prediction of local scour depth around bridge piers: modelling based on machine learning approaches

The Influence of the New LRT Pier to the Sedimentation Pattern Around Ampera Bridge in Musi River, South Sumatera, Indonesia

Combination of Riprap and Submerged Vane as an Abutment Scour Countermeasure

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