Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents
The safety of coastal structures is a growing global concern due to the combined effects of strong tides and river flow. In this study, the local scour around cylinders under the influence of tides combined with river flows was investigated numerically. When only tidal current is considered, the dis...
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MDPI AG
2025-06-01
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| Seria: | Journal of Marine Science and Engineering |
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| _version_ | 1839653635111256064 |
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| author | Yuezhang Xia Jiahao Liu Shiyu Yang Shaohua Wang Li Li |
| author_facet | Yuezhang Xia Jiahao Liu Shiyu Yang Shaohua Wang Li Li |
| author_sort | Yuezhang Xia |
| collection | DOAJ |
| description | The safety of coastal structures is a growing global concern due to the combined effects of strong tides and river flow. In this study, the local scour around cylinders under the influence of tides combined with river flows was investigated numerically. When only tidal current is considered, the distribution of vorticity and excess shear stress on the bed varies periodically with the inflow velocity. The scour depth gradually increased. When coupling the river flow and tidal current, the scour depth on the river side is 1.3 times deeper than that on the tide side; the relative scour depth (the ratio of scour depth to pile diameter, <i>S</i>/<i>D</i>) deepened linearly with the increase of river flow intensity. In the river–tide-coupled condition, the impact of river flow on scour is greater under fixed-bed conditions than under movable-bed conditions. Under fixed-bed conditions, the maximum scour depth in the river–tide-coupled case is 3.94 times larger than that in the tide case. The relative scour depth gradually decreased with the increase in the relative diameter of the cylinder. The scour hole becomes more asymmetric with the increased cylinder diameter. The scour process became slower and the scour rate was smaller when tidal periods increased. The findings supplement the mechanism of local scour under river–tide coupling and provide guiding significance for pile foundation protection in an estuary. |
| format | Article |
| id | doaj-art-9fb422650ca14f78b43e18832eae481c |
| institution | Matheson Library |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-9fb422650ca14f78b43e18832eae481c2025-06-25T14:01:27ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-06-01136111410.3390/jmse13061114Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal CurrentsYuezhang Xia0Jiahao Liu1Shiyu Yang2Shaohua Wang3Li Li4Ocean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaThe safety of coastal structures is a growing global concern due to the combined effects of strong tides and river flow. In this study, the local scour around cylinders under the influence of tides combined with river flows was investigated numerically. When only tidal current is considered, the distribution of vorticity and excess shear stress on the bed varies periodically with the inflow velocity. The scour depth gradually increased. When coupling the river flow and tidal current, the scour depth on the river side is 1.3 times deeper than that on the tide side; the relative scour depth (the ratio of scour depth to pile diameter, <i>S</i>/<i>D</i>) deepened linearly with the increase of river flow intensity. In the river–tide-coupled condition, the impact of river flow on scour is greater under fixed-bed conditions than under movable-bed conditions. Under fixed-bed conditions, the maximum scour depth in the river–tide-coupled case is 3.94 times larger than that in the tide case. The relative scour depth gradually decreased with the increase in the relative diameter of the cylinder. The scour hole becomes more asymmetric with the increased cylinder diameter. The scour process became slower and the scour rate was smaller when tidal periods increased. The findings supplement the mechanism of local scour under river–tide coupling and provide guiding significance for pile foundation protection in an estuary.https://www.mdpi.com/2077-1312/13/6/1114tidesriver flowcouplinglocal scournumerical simulation |
| spellingShingle | Yuezhang Xia Jiahao Liu Shiyu Yang Shaohua Wang Li Li Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents Journal of Marine Science and Engineering tides river flow coupling local scour numerical simulation |
| title | Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents |
| title_full | Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents |
| title_fullStr | Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents |
| title_full_unstemmed | Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents |
| title_short | Scour Depth Around Cylinders Under Combined Effects of River Flow and Tidal Currents |
| title_sort | scour depth around cylinders under combined effects of river flow and tidal currents |
| topic | tides river flow coupling local scour numerical simulation |
| url | https://www.mdpi.com/2077-1312/13/6/1114 |
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