Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles

Zhenhua Xu; Baoshu Yin; Hongwei Yang; Jifeng Qi

doi:10.1007/s00343-012-1188-6

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Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles

Updated：2023-05-16

- Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles
- Journal of Oceanology and Limnology Vol. 30, Issue 4, Pages: 703-712(2012)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Key Laboratory of Ocean Circulation and Waves (KLOCAW) Chinese Academy of Sciences
  3. Nantong Branch Institute of Oceanology Chinese Academy of Sciences
  4. Graduate University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-012-1188-6
  CLC：
- Online First：02 July 2012，
  
  Published：2012
- Accepted：
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Xu, Z., Yin, B., Yang, H. et al. Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles., Chin. J. Ocean. Limnol. 30, 703–712 (2012). https://doi.org/10.1007/s00343-012-1188-6
DOI：

Xu, Z., Yin, B., Yang, H. et al. Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles., Chin. J. Ocean. Limnol. 30, 703–712 (2012). https://doi.org/10.1007/s00343-012-1188-6 DOI：

摘要

Abstract

Both large amplitude depression and elevation internal solitary waves (ISWs) were observed on the continental shelf of the northwest South China Sea (SCS) during the Wenchang Internal Wave Experiment. In this study

we investigate the characteristics of depression and elevation ISWs based on comparisons between observational results and internal wave theories. It is suggested that the large amplitude depression wave is better represented by the extended Korteweg-de Vries (EKdV) theory than by the KdV model

whereas the large amplitude elevation wave is in better agreement with the KdV equation than with the EKdV theory. Wave-induced forces on a supposed small-diameter cylindrical pile by depression and elevation waves are also estimated using the internal wave theory and Morison formula. The wave-induced force by elevation ISWs is rarely reported in the literature. It is found that the force induced by the elevation wave differs significantly from that by the depression wave

and the elevation wave generally produces greater force on the pile in the lower water column than the depression wave. These results show that ISWs in the study area can present a serious threat to ocean engineering structures

and should not be ignored in the design of oil platforms and ocean operations.

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references

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