Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods
In curved channels, secondary flows arise due to the balance between centrifugal and gravitational forces, causing a vertical redistribution of flow that significantly alters bed shear stress and sediment transport. The introduction of hydraulic structures such as bridge piers further intensifies th...
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Razi University
2025-06-01
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| Series: | مدلسازی پیشرفته در مهندسی عمران |
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| Online Access: | https://amcen.razi.ac.ir/article_3791_191ddf7569423553435687be12f8fe0e.pdf |
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| author | Pooya Biranvand Hamidreza Vossoughifar Milad Khorani Hamzeh Heidari Soureshjani |
| author_facet | Pooya Biranvand Hamidreza Vossoughifar Milad Khorani Hamzeh Heidari Soureshjani |
| author_sort | Pooya Biranvand |
| collection | DOAJ |
| description | In curved channels, secondary flows arise due to the balance between centrifugal and gravitational forces, causing a vertical redistribution of flow that significantly alters bed shear stress and sediment transport. The introduction of hydraulic structures such as bridge piers further intensifies the complexity of flow patterns and local scour processes. This study investigates the effects of pier placement in a 180-degree bend of a U-shaped channel using both experimental and numerical approaches. Six angular pier positions (0°, 30°, 60°, 90°, 120°, and 150°) were analyzed, with positions at 60° and 150° used for model validation. The study employed the finite volume method (FVM) via Fluent software and validated the results against physical experiments using ADV-based velocity profiling and bed morphology measurements. Results show that the magnitude of bed material removal is greater within the bend compared to straight reaches due to intensified helical flows. Notably, the most severe sediment deposition occurred at 30° and 60°, while reduced scour was observed at 150°. Based on flow behavior and scour depth analysis, optimal pier locations were identified to be within 0°–30° and 90°–180°, balancing flow stability and minimizing bed degradation. |
| format | Article |
| id | doaj-art-e73a0e53f03b46199ecad8641c6a2cc3 |
| institution | OA Journals |
| issn | 3060-7620 |
| language | fas |
| publishDate | 2025-06-01 |
| publisher | Razi University |
| record_format | Article |
| series | مدلسازی پیشرفته در مهندسی عمران |
| spelling | doaj-art-e73a0e53f03b46199ecad8641c6a2cc32025-08-20T02:38:40ZfasRazi Universityمدلسازی پیشرفته در مهندسی عمران3060-76202025-06-01219511110.22126/amcen.2025.11383.10313791Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume MethodsPooya Biranvand0Hamidreza Vossoughifar1Milad Khorani2Hamzeh Heidari Soureshjani3PhD student, Department of Civil Engineering, Faculty of Engineering Technology, Islamic Azad University, South Tehran Branch, Tehran, IranAssistant Professor, Department of Civil and Environmental Engineering and Water Resources Research Center, University of Hawaii at Manoa, Honolulu, Hawaii, USAMaster of Science, Department of Civil Engineering, Faculty of Engineering Technology, Islamic Azad University, South Tehran Branch, Tehran, IranMaster of Science, Department of Civil Engineering, Faculty of Engineering Technology, Islamic Azad University, South Tehran Branch, Tehran, IranIn curved channels, secondary flows arise due to the balance between centrifugal and gravitational forces, causing a vertical redistribution of flow that significantly alters bed shear stress and sediment transport. The introduction of hydraulic structures such as bridge piers further intensifies the complexity of flow patterns and local scour processes. This study investigates the effects of pier placement in a 180-degree bend of a U-shaped channel using both experimental and numerical approaches. Six angular pier positions (0°, 30°, 60°, 90°, 120°, and 150°) were analyzed, with positions at 60° and 150° used for model validation. The study employed the finite volume method (FVM) via Fluent software and validated the results against physical experiments using ADV-based velocity profiling and bed morphology measurements. Results show that the magnitude of bed material removal is greater within the bend compared to straight reaches due to intensified helical flows. Notably, the most severe sediment deposition occurred at 30° and 60°, while reduced scour was observed at 150°. Based on flow behavior and scour depth analysis, optimal pier locations were identified to be within 0°–30° and 90°–180°, balancing flow stability and minimizing bed degradation.https://amcen.razi.ac.ir/article_3791_191ddf7569423553435687be12f8fe0e.pdfchannel bendbridge pierlocal scoursedimentfinite volume method |
| spellingShingle | Pooya Biranvand Hamidreza Vossoughifar Milad Khorani Hamzeh Heidari Soureshjani Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods مدلسازی پیشرفته در مهندسی عمران channel bend bridge pier local scour sediment finite volume method |
| title | Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods |
| title_full | Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods |
| title_fullStr | Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods |
| title_full_unstemmed | Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods |
| title_short | Assessment of Local Scour Patterns Around Bridge Piers and Optimal Placement in a 180-Degree Bend Using Experimental and Finite Volume Methods |
| title_sort | assessment of local scour patterns around bridge piers and optimal placement in a 180 degree bend using experimental and finite volume methods |
| topic | channel bend bridge pier local scour sediment finite volume method |
| url | https://amcen.razi.ac.ir/article_3791_191ddf7569423553435687be12f8fe0e.pdf |
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