Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Frequency analysis of wave run-up on vertical cylinder in transitional water depth

  • Deng, Yanfei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Yang, Jianmin (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Xiao, Longfei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Shen, Yugao (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
  • Received : 2014.03.05
  • Accepted : 2014.08.25
  • Published : 2014.09.25
⟨ Previous Next ⟩

Abstract

Wave run-up is an important issue in offshore engineering, which is tightly related to the loads on the marine structures. In this study, a series of physical experiments have been performed to investigate the wave run-up around a vertical cylinder in transitional water depth. The wave run-ups of regular waves, irregular waves and focused waves have been presented and the characteristics in frequency domain have been investigated with the FFT and wavelet transform methods. This study focuses on the nonlinear features of the wave run-up and the interaction between the wave run-up and the cylinder. The results show that the nonlinear interaction between the waves and the structures might result wave run-up components of higher frequencies. The wave run-ups of the moderate irregular waves exhibit 2nd order nonlinear characteristics. For the focused waves, the incident waves are of strong nonlinearity and the wavelet coherence analysis reveals that the wave run-up at focal moment contains combined contributions from almost all the frequency components of the focused wave sequence and the contributions of frequency components up to 4th order harmonic levels are recommended to be included.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation

References

  1. De Vos, L., Frigaard, P. and De Rouck, J. (2007), "Wave run-up on cylindrical and cone shaped foundations for offshore wind turbines", Coast. Eng., 54(1), 17-29. https://doi.org/10.1016/j.coastaleng.2006.08.004
  2. Hallermeier, R.J. (1976), "Nonlinear flow of wave crests past a thin pile", J. Waterw. Harbors Coast. Eng., 102(4), 365-377.
  3. Kriebel, D.L. (1987), A second-order diffraction theory for wave run-up and wave forces on a vertical circular cylinder, University of Florida.
  4. Kriebel, D.L. and Alsina, M.V. (2000), Simulation of extreme waves in a background random sea.
  5. Kwon, S., Lee, H. and Kim, C. (2005), "Wavelet transform based coherence analysis of freak wave and its impact", Ocean Eng., 32(13), 1572-1589. https://doi.org/10.1016/j.oceaneng.2004.11.009
  6. Li, J.X., Wang, Z. and Shu-xue, L. (2012), "Experimental Study of interactions between multi-directional focused waves and vertical circular cylinder, Part I: Wave run-up", Coast. Eng., 64, 151-160. https://doi.org/10.1016/j.coastaleng.2012.02.003
  7. Lykke Andersen, T., Frigaard, P., Damsgaard, M. and De Vos, L. (2011), "Wave run-up on slender piles in design conditions-Model tests and design rules for offshore wind", Coast. Eng., 58(4), 281-289. https://doi.org/10.1016/j.coastaleng.2010.10.002
  8. MacCamy, R.C. and Fuchs, R.A. (1954), Wave forces on piles: A diffraction theory, DTIC Document.
  9. Mase, H., Kosho, K. and Nagahashi, S. (2001), "Wave runup of random waves on a small circular pier on sloping seabed", J. Waterw. Port C-ASCE, 127(4), 192-199. https://doi.org/10.1061/(ASCE)0733-950X(2001)127:4(192)
  10. Morris-Thomas, M. and Thiagarajan, K. (2005), "The run-up on a cylinder in progressive surface gravity waves: harmonic components", Appl. Ocean Res., 26(3), 98-113.
  11. Niedzwecki, J.M., Duggal, A.S. (1992), "Wave runup and forces on cylinders in regular and random waves", J. Waterw. Port Coast. Ocean Eng., 118(6), 615-634. https://doi.org/10.1061/(ASCE)0733-950X(1992)118:6(615)
  12. Shu-xue, L., Yi-yan, S., Jin-xuan, L. and Jun, Z. (2010), "Experimental study on 2-D focusing wave run-up on a vertical cylinder", China Ocean Eng., 24 (3), 499-512.

Cited by

  1. Investigating the Effect of Distance and Diameter Ratio of Elliptical Piles on the Amount of Force Exerted by Waves in the Pile Groups with Regular Layout vol.8, pp.1, 2018, https://doi.org/10.2478/jaes-2018-0005