Experimental Study of Local Scour around Side-by-Side Bridge Piers under Ice-Covered Flow Conditions

Namaee, Mohammad Reza; Sui, Jueyi; Wu, Peng

doi:10.5772/intechopen.86369

Cited by 3 publications

(4 citation statements)

References 34 publications

(44 reference statements)

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“…5c. scour patterns around the 110-mm bridge pier for D 50 = 0.47 mm type under rough for the highest flow discharge (Namaee et al, 2019). sediment type, the values of the velocity component are mostly negative within the scour hole which is an indication of reversal flow happening due to the presence of horseshoe vortex which is strongest at the pier face.…”

Section: )mentioning

confidence: 90%

“…Of note, the maximum scour depth between left hand side and the righthand side bridge piers were more or less identical. Note that this study is a part of a broad project in which impact of different parameters such as densimetric Froude number, armor layer, pier spacing and flow cover on the local scour in the vicinity of bridge piers has been painstakingly investigated (Namaee and Sui, 2019a;Sui, 2019b andNamaee et al, 2019). Therefore, Fig.…”

Section: Run #mentioning

confidence: 99%

“…5(a-c) for open, smooth, and rough flow cover, respectively. Note that Namaee et al (2019) already investigated the scour morphology around the 110-mm bridge pier under highest flow discharge for D 50 = 0.47 mm. The reason why the same scour morphology is shown here is firstly because the aforementioned scour morphology is the most critical one in which the highest maximum scour depth was reached and secondly many more scour depths were collected for this scour morphology after the experiment to show a higher resolution scour morphology.…”

Section: Run #mentioning

confidence: 99%

“…Scour pattern around the 110-mm bridge pier for D 50 = 0.47 mm type under open for the highest flow discharge(Namaee et al, 2019).…”

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confidence: 99%

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Velocity profiles and turbulence intensities around side-by-side bridge piers under ice-covered flow condition

Namaee

Sui

2020

Journal of Hydrology and Hydromechanics

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Recent studies have shown that the presence of ice cover leads to an intensified local scour pattern in the vicinity of bridge piers. To investigate the local scour pattern in the vicinity of bridge pier under ice-covered flow condition comparing to that under open channel flow condition, it is essential to examine flow field around bridge piers under different flow conditions. In order to do so, after creation of smooth and rough ice covers, three-dimensional timeaveraged velocity components around four pairs of bridge piers were measured using an Acoustic Doppler velocimetry (ADV). The ADV measured velocity profiles describe the difference between the velocity distributions in the vicinity of bridge piers under different covered conditions. Experimental results show that the vertical velocity distribution which represents the strength of downfall velocity is the greatest under rough covered condition which leads to a greater scour depth. Besides, results show that the turbulent intensity increases with pier size regardless of flow cover, which implies that larger scour depth occurs around piers with larger diameter.

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confidence: 90%

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confidence: 99%

Section: Run #mentioning

confidence: 99%

“…Scour pattern around the 110-mm bridge pier for D 50 = 0.47 mm type under open for the highest flow discharge(Namaee et al, 2019).…”

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confidence: 99%

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Velocity profiles and turbulence intensities around side-by-side bridge piers under ice-covered flow condition

Namaee

Sui

2020

Journal of Hydrology and Hydromechanics

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Prediction of scour depth around bridge abutments using ensemble machine learning models

Marulasiddappa,

Patil,

Kuntoji

et al. 2023

Neural Comput & Applic

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Abutments are the structures that support the ends of a bridge deck. Scouring of streambed is a significant problem and ultimately results in the failure of the bridge when the abutments are exposed to flowing water over the long term. Abutment scour is influenced by the type of abutment, shape, and size of the abutments. In the current study, machine learning (ML) models have been utilized for predicting the scour depth around abutments making use of experimental data. The scour depth was modeled around three types of abutments: a vertical wall, a semicircular wall, and a 45° wing wall. Five input parameters, namely, the length of the abutment (L), breadth of the abutment (B), sediment size (d50), approaching flow depth (h) and average approaching flow velocity (U), were used in this study. For predicting the abutment scour depth, ML models such as Adaptive Neuro-Fuzzy Inference System (ANFIS), Gradient Tree Boosting (GTB), Group Method of Data Handling (GMDH), and Multivariate Adaptive Regression Splines (MARS) were applied. Statistical metrics such as Mean Absolute Error (MAE), Root Mean Square Error (RMSE), Relative RMSE (RRMSE), Normalized Nash–Sutcliffe Efficiency (NNSE), Kling-Gupta Efficiency (KGE), and Willmott Index (WI) have been employed to evaluate the performance of each model. It was found that the GTB model provided relatively accurate predictions of the scour depth around the semicircular and 45° wing wall abutments with good metrics. Similarly, the MARS model outperformed all other models in terms of predicting vertical wall abutment scour depth.

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Comparación experimental de la socavación alrededor de pila cuadrada de puente con y sin paneles sumergidos

Barros,

Echeverría,

Hamad-Mohamed

et al. 2024

Tecnol. cienc. agua

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En el presente artículo se presentan los resultados de la investigación experimental sobre la socavación alrededor de una pila de puente de sección cuadrada, en presencia de paneles sumergidos y su comparación con la investigación realizada en ausencia de estos, teniendo ambas iguales condiciones de contorno. Para el estudio se usó arena con una granulometría conocida y uniforme colocada en el tramo de control del canal, una pila de hormigón de sección cuadrada y paneles sumergidos hechos en acrílico. La investigación se desarrolló en el canal hidrodinámico ubicado en las instalaciones del Centro de Investigaciones y Estudios en Recursos Hídricos de la Escuela Politécnica Nacional (CIERHI-EPN) e incluye: la medición experimental de la acumulación de sedimento en el foso de socavación local que se genera alrededor de la pila en presencia de los paneles, el transporte de sedimentos, los cambios generados en la topografía del fondo debido a los vórtices inducidos por los paneles, el procedimiento de medición de velocidades instantáneas de un flujo turbulento aguas abajo de la pila usando un velocímetro acústico Doppler (ADV por sus siglas en inglés) marca SonTek modelo “FlowTracker 2” y el tratamiento de datos realizado. La comparación con los resultados obtenidos en una investigación previa (sin el uso de paneles sumergidos) permite demostrar que el uso de paneles sumergidos disminuye el efecto de la socavación al pie de las pilas y generan cambios en las características de la turbulencia.

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Experimental Study of Local Scour around Side-by-Side Bridge Piers under Ice-Covered Flow Conditions

Cited by 3 publications

References 34 publications

Velocity profiles and turbulence intensities around side-by-side bridge piers under ice-covered flow condition

Velocity profiles and turbulence intensities around side-by-side bridge piers under ice-covered flow condition

Prediction of scour depth around bridge abutments using ensemble machine learning models

Comparación experimental de la socavación alrededor de pila cuadrada de puente con y sin paneles sumergidos

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