| Numerical modeling of local scour of non-uniform graded sediment for two arrangements of pile groups |
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| 作者姓名： | Saeid Okhravi Saeed Gohari Mahdi Alemi Rodrigo Maia |
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| 作者单位： | 2. Department of Water Engineering, College of Agriculture, Bu-Ali Sina University;3. Departamento de Engenharia Civil, Faculdadede Engenharia, Universidade do Porto;4. CIIMAR-Interdisciplinary Centre of Marine and Environmental Research, University of Porto |
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| 摘 要： | A three-dimensional(3D) non-hydrostatic numerical model is established to investigate local scour around four aligned circular piles in uniform and non-uniform sediment mixtures and to provide information for improving scour countermeasures design. In the current study, unsteady Reynolds averaged Navier-Stokes(URANS) equations along with a Re-normalization Group(RNG) k-ε model were applied to simulate the flow field. A non-uniform sediment transport model was applied to estimate the bedload tran...
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| 收稿时间： | 12 October 2022 |
Numerical modeling of local scour of non-uniform graded sediment for two arrangements of pile groups |
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| Saeid Okhravi,Saeed Gohari,Mahdi Alemi,Rodrigo Maia.Numerical modeling of local scour of non-uniform graded sediment for two arrangements of pile groups[J].International Journal of Sediment Research,2023,38(4):597-614. |
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| Institution: | 1. Institute of Hydrology, Slovak Academy of Sciences, Dúbravská Cesta 9, 84104, Bratislava, Slovak Republic;2. Department of Water Engineering, College of Agriculture, Bu-Ali Sina University, 65178-38695, Hamadan, Iran;3. Departamento de Engenharia Civil, Faculdadede Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, Porto 4200-465, Portugal;4. CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, 4450-208, Matosinhos, Portugal;1. Departamento de Química, Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, La Marquesa, Ocoyoacac, Estado de México C. P. 52750, Mexico;2. CONACyT – Instituto Nacional de Investigaciones Nucleares, La Marquesa, Ocoyoacac, Estado de México, Mexico;1. Department of Earth Sciences, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon;2. University Institute of Technology, University of Douala, P.O. Box 8698, Douala, Cameroon;3. Department of Mining and Mineral Engineering, National Higher Polytechnic Institute, University of Bamenda, P.O. Box 39, Bambili, Cameroon;4. Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, P.O. Box 222, Dschang, Cameroon;5. Department of Mining and Geology, School of Geology and Mining Engineering, University of Ngaoundere, P.O. Box 115, Meiganga, Cameroon;1. Environmental Geochemistry Laboratory, Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, PO 45320, Pakistan;2. Graduate School of Sciences and Engineering, Kagoshima University, Japan;3. Department of Earth and Planetary Environmental Science (UG), Graduate School of Science, The University of Tokyo, Japan;4. Department of Earth and Planetary Physics (UG), Graduate School of Science, The University of Tokyo, Japan;5. Department of Earth and Planetary Science (GR), Graduate School of Science, The University of Tokyo, Japan;6. Department of Environmental Sciences, University of Baltistan Skardu, Pakistan;1. Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box 46414-356, Noor, Iran;2. Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland;3. Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box 46414-356, Noor, Iran;4. Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box 46414-356, Noor, Iran |
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| Abstract: | A three-dimensional (3D) non-hydrostatic numerical model is established to investigate local scour around four aligned circular piles in uniform and non-uniform sediment mixtures and to provide information for improving scour countermeasures design. In the current study, unsteady Reynolds averaged Navier–Stokes (URANS) equations along with a Re-normalization Group (RNG) k–ε model were applied to simulate the flow field. A non-uniform sediment transport model was applied to estimate the bedload transport. The simulations lasted up to 8 h. The laboratory results of a reference single pile case in uniform and non-uniform sediment were utilized to validate the simulation results of bed elevation changes and time evolution of scour depth and reflected a good agreement. The influence of pile spacing for two arrangements of pile groups, one column (tandem) and two columns (non-tandem) of four aligned piles, on spatial/temporal variations of the bed surface in both sediment bed configurations are discussed in detail. The results reveal the significant effects of the pile spacing on the flow field and patterns of scour hole formation and sediment deposition. In general, lower pile spacing results in more scour upstream of the front pile(s) and shifts deposition more downstream due to the existence of higher energy in the wake region of the piles for both sediment types. Side scouring dominates for non-uniform sediment around each pile due to flow deviating because of the presence of relatively larger particles in front of the pile(s). For non-uniform sediment, deposition begins to develop at the exit area of the scour hole and enhances boundary resistance to scour. The knowledge gained from this study is suitable for the accurate determination of riprap dimensions around the front pile(s) and rear piles in a pile group. |
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| Keywords: | Local bridge pier scour Non-uniform sediment Numerical modeling Pile groups Pile spacing Sediment transport |
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