Current-induced scour at monopile foundations subjected to lateral vibrations
Monopile foundations are the most common foundation type of offshore wind turbines. In the ocean environment, in addition to threats related to scour of the foundation, offshore monopiles of wind turbines also are subjected to lateral vibrations induced by waves and winds. Over the past decades, the...
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sg-ntu-dr.10356-1512022021-08-31T06:32:44Z Current-induced scour at monopile foundations subjected to lateral vibrations Guan, Dawei Chiew, Yee-Meng Melville, Bruce W. Zheng, Jinhai School of Civil and Environmental Engineering Engineering::Civil engineering Scour Monopile Monopile foundations are the most common foundation type of offshore wind turbines. In the ocean environment, in addition to threats related to scour of the foundation, offshore monopiles of wind turbines also are subjected to lateral vibrations induced by waves and winds. Over the past decades, the scour process induced by flow and pile-soil interactions has been independently investigated by researchers from the fields of hydraulic/coastal engineering and soil mechanics, respectively. Very few studies can be found in the published literature on lateral vibration effects on scour at monopile foundations. The objective of this experimental study is to improve understanding of the mechanics of current-induced scour at monopiles subjected to lateral vibrations with a non-cohesive bed. When compared to a non-vibrating monopile, the results show that scouring around its vibrating counterpart is comparatively faster during the first few hours of the test. This is primarily due to soil densification and the subsidence process induced by monopile-seabed interactions. Increasing both the frequency and amplitude of the monopile vibration would decrease the equilibrium scour depths and scour hole slopes. The reduction of equilibrium scour depth likely is due to the effect of sediment ratcheting motions on the surface of the scour hole. An empirical dimensionless equation is proposed to estimate equilibrium scour depth at monopiles subjected to lateral vibrations. This research was supported by the Young Scientists Fund of the National Natural Science Foundation of China (51709082), the Fundamental Research Funds for the Central Universities (2018B13014), the National Science Fund for Distinguished Young Scholars of China (51425901) and 111 Project of China (B12032). 2021-08-31T06:32:43Z 2021-08-31T06:32:43Z 2018 Journal Article Guan, D., Chiew, Y., Melville, B. W. & Zheng, J. (2018). Current-induced scour at monopile foundations subjected to lateral vibrations. Coastal Engineering, 144, 15-21. https://dx.doi.org/10.1016/j.coastaleng.2018.10.011 0378-3839 https://hdl.handle.net/10356/151202 10.1016/j.coastaleng.2018.10.011 2-s2.0-85059299407 144 15 21 en Coastal Engineering © 2018 Elsevier B.V. All rights reserved. |
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Engineering::Civil engineering Scour Monopile Guan, Dawei Chiew, Yee-Meng Melville, Bruce W. Zheng, Jinhai Current-induced scour at monopile foundations subjected to lateral vibrations |
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Monopile foundations are the most common foundation type of offshore wind turbines. In the ocean environment, in addition to threats related to scour of the foundation, offshore monopiles of wind turbines also are subjected to lateral vibrations induced by waves and winds. Over the past decades, the scour process induced by flow and pile-soil interactions has been independently investigated by researchers from the fields of hydraulic/coastal engineering and soil mechanics, respectively. Very few studies can be found in the published literature on lateral vibration effects on scour at monopile foundations. The objective of this experimental study is to improve understanding of the mechanics of current-induced scour at monopiles subjected to lateral vibrations with a non-cohesive bed. When compared to a non-vibrating monopile, the results show that scouring around its vibrating counterpart is comparatively faster during the first few hours of the test. This is primarily due to soil densification and the subsidence process induced by monopile-seabed interactions. Increasing both the frequency and amplitude of the monopile vibration would decrease the equilibrium scour depths and scour hole slopes. The reduction of equilibrium scour depth likely is due to the effect of sediment ratcheting motions on the surface of the scour hole. An empirical dimensionless equation is proposed to estimate equilibrium scour depth at monopiles subjected to lateral vibrations. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Guan, Dawei Chiew, Yee-Meng Melville, Bruce W. Zheng, Jinhai |
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Article |
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Guan, Dawei Chiew, Yee-Meng Melville, Bruce W. Zheng, Jinhai |
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Guan, Dawei |
title |
Current-induced scour at monopile foundations subjected to lateral vibrations |
title_short |
Current-induced scour at monopile foundations subjected to lateral vibrations |
title_full |
Current-induced scour at monopile foundations subjected to lateral vibrations |
title_fullStr |
Current-induced scour at monopile foundations subjected to lateral vibrations |
title_full_unstemmed |
Current-induced scour at monopile foundations subjected to lateral vibrations |
title_sort |
current-induced scour at monopile foundations subjected to lateral vibrations |
publishDate |
2021 |
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https://hdl.handle.net/10356/151202 |
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1709685307506425856 |