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Propagation and amplitude decay mechanisms of internal solitary waves

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Abstract

In this paper, a modified dynamic coherent eddy model (DCEM) of large eddy simulation is applied to study internal solitary waves in a numerical flume. The model was verified by physical experiment and applied to investigate the potential influence factors on internal wave amplitude. In addition, we discussed the energy loss of internal solitary wave as well as hydrodynamics in the propagation. The results of our study show that (1) Step-depth is the most sensitive factor on wave amplitude for the “step-pool” internal wave generation method and the wave amplitudes obey a linear increase with step depth, and the increase rate is about 0.4. (2) Wave energy loss obeys a linear decrease with the propagation distance and its loss rate of large amplitude waves is smaller than that of small amplitude waves. (3) Loss of kinetic energy in wave valley is larger than that near the interface due to relative high fluctuating frequency. (4) Discovered boundary jet-flow can intensify the bottom shear, which might be one of the mechanisms of substance transportation, and the boundary layers of jet flows are easily influenced by the adjacent waves.

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Authors and Affiliations

  1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing, 210008, China

    Ling-ling Wang  (王玲玲) & Hong-wu Tang  (唐洪武)

  2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210029, China

    Ling-ling Wang  (王玲玲), Chun-ling Wang  (王春凌), Hong-wu Tang  (唐洪武) & Hong Chen  (陈 红)

Authors
  1. Ling-ling Wang  (王玲玲)
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  2. Chun-ling Wang  (王春凌)
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  3. Hong-wu Tang  (唐洪武)
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  4. Hong Chen  (陈 红)
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Corresponding author

Correspondence to Hong-wu Tang  (唐洪武).

Additional information

The project was financially supported by the National Natural Science Foundation of China (Grant No. 51479058), the Special Fund for Public Welfare of Water Resources Ministry (Grant No. 201501007), the State Key Program of National Natural Science of China (Grant No. 51239003) and the 111 Project (Grant No. B12032), the Fundamental Research Funds for the Central Universities (Grant No. 2014B36114) and the Innovation Project of the Scientific Research for College Graduates of Jiangsu Province (Grant No. KYLX_0467).

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Wang, Ll., Wang, Cl., Tang, Hw. et al. Propagation and amplitude decay mechanisms of internal solitary waves. China Ocean Eng 30, 979–991 (2016). https://doi.org/10.1007/s13344-016-0064-0

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  • DOI: https://doi.org/10.1007/s13344-016-0064-0

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