ISSN ：1674-2370
CN ：32-1785/TV
| Citation: | Song-gui Chen, En-yu Gong, Xu Zhao, Taro Arikawa, Xin Chen. 2022: Large-scale experimental study on scour around offshore wind monopiles under irregular waves. Water Science and Engineering, 15(1): 40-46. doi: 10.1016/j.wse.2021.12.003
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The Keulegan-Carpenter (KC) number is the main dimensionless parameter that affects the local scour of offshore wind power monopile foundations. This study conducted large-scale (1:13) physical model tests to study the local scour shape, equilibrium scour depth, and local scour volume of offshore wind power monopiles under the action of irregular waves with different KC numbers. Systematic experiments were carried out with the KC number ranging from 1.0 to 13.0. With a small KC number (KC < 6), and especially when the KC number was less than 4, the scour mainly occurred on both cross-flow sides of the monopile with a low scour depth. When the KC number exceeded 4, the shape of the scour hole changed from a fan to an ellipse, and the maximum scour depth increased significantly with KC. With a large KC number (KC > 6), the proposed method better predicted the equilibrium scour depth when the wave broke. In addition, according to the results of three-dimensional terrain scanning, the relationship between the local equilibrium scour volume of a single offshore wind power monopile and the KC number was derived. This provided a rational method for estimation of the riprap redundancy for monopile protection against scour.
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Carreiras, J., Larroudé, P., Seabra-Santos, F., Mory, M., 2000. Wave scour around piles. In:Proceedings of the 27th International Conference on Coastal Engineering. ASCE, Sydney, pp. 1860-1870.
|
|
Chen, B., Li, S.W., 2018. Experimental study of local scour around a vertical cylinder under wave only and combined wave-current conditions in a large-scale flume. J. Hydraul. Res. 144(9), 04018058. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001502.
|
|
Imam, B.M., Marios, K., 2018. Causes and consequences of metallic bridge failures. Struct. Eng. Int. 22(1), 93-98. https://doi.org/10.2749/101686612X13216060213437.
|
|
Li, J.Z., Fuhrman, D.R., Kong, X., Xie, M.X., Yang, Y.L., 2021. Three-dimensional numerical simulation of wave-induced scour around a pile on a sloping beach.Ocean Eng. 233, 109174. https://doi.org/10.1016/j.oceaneng.2021.109174.
|
|
Liu, X.J., Liu, C., Zhu, X.W., He, Y., Wang, Q.S., Wu, Z.Y., 2020. 3D modeling and mechanism analysis of breaking wave-induced seabed scour around monopile. Math. Probl. Eng. 2020, 1647640. https://doi.org/10.1155/2020/1647640.
|
|
Prepernau, U., Gruene, J., Schmidt-Koppenhagen, R., Wang, Z., Oumeraci, H., 2008. Large-scale model tests on scour around slender monopile under live-bed conditions. In:Proceedings of the 2nd International Conference on the Application of Physical Modelling to Port and Coastal Protection(CoastLab 2008). Bari, pp. 1-8.
|
|
Sumer, B.M., Christiansen, N., Fedsøe, J., 1992a. Time scale of scour around a vertical pile. In:Proceedings of the 2nd International Offshore and Polar Engineering Conference. ISOPE, San Francisco, pp. 308-315. https://doi.org/10.1061/(asce)0733-950x(1996)122:2(59).
|
|
Sumer, B.M., Fredsøe, J., Christiansen, N., 1992b. Scour around vertical pile in waves. J. Waterw. Port Coast. Ocean Eng. 118(1), 15-31. https://doi.org/10.1061/(ASCE)0733-950X(1992)118:1(15).
|
|
Sumer, B.M., Christiansen, N., Fredsøe, J., 1993. Influence of cross-section on wave scour around piles. J. Waterw. Port Coast. Ocean Eng. 119(5), 477-495. https://doi.org/10.1061/(ASCE)0733-950X(1993)119:5(477).
|
|
Sumer, B.M., Christiansen, N., Fredsøe, J., 1997. Horseshoe vortex and vortex shedding around a vertical wall-mounted cylinder exposed to waves. J.Fluid Mech. 332, 41-70. https://doi.org/10.1017/S0022112096003898.
|
|
Sumer, B.M., Fredsøe, J., 2001. Scour around pile in combined waves and current. J. Hydraul. Eng. 127(5), 403-411. https://doi.org/10.1061/(ASCE)0733-9429(2001)127:5(403).
|
|
Sumer, B.M., Fredsøe, J., 2002. The Mechanics of Scour in the Marine Environment. World Scientific, London.
|
|
Wardhana, K., Hadipriono, F.C., 2003. Analysis of recent bridge failures in the United States. J. Perform. Constr. Facil. 17(3), 144-150. https://doi.org/10.1061/(ASCE)0887-3828(2003)17:3(144).
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