Abstract
This study presents an innovative theoretical approach to predicting the scour depth around a foundation in large-scale model tests based on small-scale model tests under combined waves and currents. In the present approach, the hydrodynamic parameters were designed based on the Froude similitude criteria. To avoid the cohesive behavior, we scaled the sediment size based on the settling velocity similarity, i.e., the suspended load similarity. Then, a series of different scale model tests was conducted to obtain the scour depth around the pile in combined waves and currents. The fitting formula of scour depth from the small-scale model tests was used to predict the results of large-scale tests. The accuracy of the present approach was validated by comparing the prediction values with experimental data of large-scale tests. Moreover, the correctness and accuracy of the present approach for foundations with complex shapes, e.g., the tripod foundation, was further checked. The results indicated that the fitting line from small-scale model tests slightly overestimated the experimental data of large-scale model tests, and the errors can be accepted. In general, the present approach was applied to predict the maximum or equilibrium scour depth of the large-scale model tests around single piles and tripods.
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Arboleda Chavez, C. E., Stratigaki, V., Wu, M., and Troch, P. D., 2019. Large-scale experiments to improve monopile scour protection design adapted to climate change–The PROTEUS project. Energies, 12(9): 1–25.
Corvaro, S., Marini, F., Mancinelli, A., Lorenzoni, C., and Brocchini, M., 2018. Hydro- and morpho-dynamics induced by a vertical slender pile under regular and random waves. Journal of Waterway Port Coastal and Ocean Engineering, 144(6): 04018018.
Engelund, F., and Hansen, E., 1967. A monograph on sediment transport in alluvial streams. Hydraulic Engineering Reports. Technical University of Denmark, Copenhagen, Denmark.
Ettema, R., Melville, B., and Barkdoll, B., 1998. Scale effect in pier-scour experiments. Journal of Hydraulic Engineering, 124: 639–642.
Fazeres-Ferradosa, T., Chambel, J., Taveira-Pinto, F., Rosa-Santos, P., Taveira-Pinto, F. V. C., Giannini, G., et al., 2021. Scour protections for offshore foundations of marine energy harvesting technologies: A review. Journal of Marine Science and Engineering, 9(3): 1–35.
Fazeres-Ferradosa, T., Taveira-Pinto, F., Romão, X., Reis, M., and Neves, L. D., 2019. Reliability assessment of offshore dynamic scour protections using copulas. Wind Engineering, 43(5): 506–538.
Hu, R. G., Liu, H. J., Leng, H., Yu, P., and Wang, X. H., 2021. Scour characteristics and equilibrium scour depth prediction around umbrella suction anchor foundation under random waves. Journal of Marine Science and Engineering, 9(8):1–35.
Hu, R. G., Yu, P., Wang, Z. Y., Shi, W., and Liu, H. J., 2020. Pore pressure response and residual liquefaction of two-layer silty seabed under standing waves. Ocean Engineering, 218: 108176.
Huang, L. C., and Xu, G. X., 2008. Hydraulic and River Model Test. The Yellow River Conservancy Press, Zhengzhou, 1–253 (in Chinese).
Huang, W., Yang, Q., and Xiao, H., 2009. CFD modeling of scale effects on turbulence flow and scour around bridge piers. Computers and Fluids, 38(5): 1050–1058.
Jeng, D. S., 2013. Porous Models for Wave-Seabed Interactions. Shanghai Jiao Tong University Press, Shanghai, 1–290.
Jia, Y. G., Liu, X. L., Zhang, S. T., Shan, H. X., and Zheng, J., 2020. Wave-Forced Sediment Erosion and Resuspension in the Yellow River Delta. Shanghai Jiao Tong University Press, Shanghai, 1–303.
Larsen, B. E., Fuhrman, D. R., Baykal, C., and Sumer, B. M., 2017. Tsunami-induced scour around monopile foundations. Coastal Engineering, 129: 36–49.
Le Roux, J. P., 2001. A simple method to predict the threshold of particle transport under oscillatory waves. Sedimentary Geology, 143(1): 59–70.
Lee, S. O., and Sturm, T. W., 2009. Effect of sediment size scaling on physical modeling of bridge pier scour. Journal of Hydraulic Engineering, 135(10): 793–802.
Li, H., Ong, M. C., Leira, B. J., and Myrhaug, D., 2018. Effects of soil profile variation and scour on structural response of an offshore monopile wind turbine. Journal of Offshore Mechanics and Arctic Engineering, 140: 042001.
Li, S. Q., 2016. Sediment Movement in Wave-Current Boundary. Hohai University Press, Nanjing, 1–157 (in Chinese).
Melville, B. W., and Chiew, Y. M., 1999. Time scale for local scour in bridge piers. Journal of Hydraulic Engineering, 125: 59–65.
Petersen, T. U., Sumer, B. M., and Fredsøe, J., 2012. Time scale of scour around a pile in combined waves and current. The Proceedings of the 6th International Conference on Scour and Erosion. Paris, 27–31.
Qi, W. G., and Gao, F. P., 2014. Physical modeling of local scour development around a large-diameter monopile in combined waves and current. Coastal Engineering, 83: 72–81.
Ren, Y. P., Zeng, Y., Xu, X. B., and Xu, G. H., 2021. Sedimentary changes of a sand layer in liquefied silts. Journal of Ocean University of China, 20(5): 1046–1054.
Roulund, A., Mutlu Sumer, B., Fredsøe, J., and Michelsen, J., 2005. Numerical and experimental investigation of flow and scour around a circular pile. Journal of Fluid Mechanics, 534: 351–401.
Schendel, A., Hildebrandt, A., Goseberg, N., and Schlurmann, T., 2018. Processes and evolution of scour around a monopile induced by tidal currents. Coastal Engineering, 139: 65–84.
Schendel, A., Welzel, M., Schlurmann, T., and Hsu, T. W., 2020. Scour around a monopile induced by directionally spread irregular waves in combination with oblique currents. Coastal Engineering, 161: 103751.
Simons, R., Myrhaug, D., and Thais, L., 2001. Bed friction in combined wave-current flows. The Proceedings of the 27th International Conference on Coastal Engineering. Sydney, 216–226.
Stahlmann, A., 2013. Experimental and numerical model of scour at offshore wind turbines. PhD thesis. Franzius-Institute for Hydraulic, Estuarine and Coastal Engineering. Leibniz Universität Hannover, Hannover, Germany.
Sumer, B. M., and Fredsøe, J., 1998. Wave scour around group of vertical piles. Journal of Waterway, Port, Coastal, and Ocean Engineering, 124(5): 248–256.
Sumer, B. M., and Fredsøe, J., 2001. Scour around pile in combined waves and current. Journal of Hydraulic Engineering, 127(5): 403–411.
Sumer, B. M., Christiansen, N., and Fredsøe, J., 1997. The horseshoe vortex and vortex shedding around a vertical wall-mounted cylinder exposed to waves. Journal of Fluid Mechanics, 332: 41–70.
Sumer, B. M., Fredsøe, J., and Christiansen, N., 1992. Scour around vertical pile in waves. Journal of Waterway Port Coastal and Ocean Engineering, 118(1): 15–31.
Sumer, B., and Fredsoe, J., 2002. Time scale of scour around a large vertical cylinder in waves. The Proceedings of Kitakyushu. Japan, 55–60.
Sutherland, J., and Whitehouse, R. J. S., 1998. Scale effects in the physical modelling of seabed scour. Technical Report. HR Wallingford, Oxford, UK.
Tavouktsoglou, N. S., Harris, J. M., Simons, R. R., and White-house, R. J. S., 2017. Equilibrium scour-depth prediction around cylindrical structures. Journal of Waterway, Port, Coastal, and Ocean Engineering, 143: 04017017.
Wang, Y. H., Jiang, W. G., and Wang, Y. H., 2013. Scale effects in scour physical-model tests: Cause and alleviation. Journal of Marine Science and Technology, 21: 532–537.
Welzel, M., Schendel, A., Hildebrandt, A., and Schlurmann, T., 2019. Scour development around a jacket structure in combined waves and current conditions compared to monopile foundations. Coastal Engineering, 152: 103515.
Wu, M., De Vos, L., Arboleda Chavez, C. E., Stratigaki, V., Fazeres-Ferradosa, T., Rosa-Santos, P., et al., 2020. Large scale experimental study of the scour protection damage around a monopile foundation under combined wave and current conditions. Journal of Marine Science and Engineering, 8(6): 1–30.
Xu, X. B., Xu, G. H., Ren, Y. P., Liu, Z. Q, and Chen, C. Y., 2019. Horizontal normal force on buried rigid pipelines in fluctuant liquefied silty soil. Journal of Ocean University of China, 18(1): 1–8.
Yang, L. P., Guo, Y. K., Shi, B., Kuang, C. P., Xu, W. L., and Cao, S. Y., 2012a. Study of scour around submarine pipeline with a rubber plate or rigid spoiler in wave conditions. Journal of Waterway, Port, Coastal, and Ocean Engineering, 138(6): 484–490.
Yang, L. P., Shi, B., Guo, Y. K., and Wen, X. Y., 2012b. Calculation and experiment on scour depth for submarine pipeline with a spoiler. Ocean Engineering, 55: 191–198.
Yang, L. P., Shi, B., Guo, Y. K., Zhang, L. X., Zhang, J. S., and Han, Y., 2014. Scour protection of submarine pipelines using rubber plates underneath the pipes. Ocean Engineering, 84: 176–182.
Yu, P., Hu, R. G., Yang, J. M., and Liu, H. J., 2020. Numerical investigation of local scour around USAF with different hydraulic conditions under currents and waves. Ocean Engineering, 213: 107696.
Zhang, K. Y., and Jin, Z. G., 2017. Fluid Dynamics. Science Press, Beijing, 1–360 (in Chinese).
Zhao, C. J., and Xu, J., 2009. Study on extension method of series models in bed erosion prediction. Journal of Waterway and Harbor, 30(4): 229–232 (in Chinese with English abstract).
Zhou, Z. L., 2009. Coastal Dynamics. 4th edition. China Communication Press, Beijing, 1–252 (in Chinese).
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This work was financially supported by the Fundamental Research Funds for the Central Universities (No. 2020610 27), and the National Natural Science Foundation of China (No. 41572247).
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Hu, R., Liu, H., Lu, Y. et al. An Innovative Approach to Predicting Scour Depth Around Foundations Under Combined Waves and Currents in Large-Scale Tests Based on Small-Scale Tests. J. Ocean Univ. China 22, 637–648 (2023). https://doi.org/10.1007/s11802-023-5228-y
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DOI: https://doi.org/10.1007/s11802-023-5228-y